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Parzyck CT, Gupta NK, Wu Y, Anil V, Bhatt L, Bouliane M, Gong R, Gregory BZ, Luo A, Sutarto R, He F, Chuang YD, Zhou T, Herranz G, Kourkoutis LF, Singer A, Schlom DG, Hawthorn DG, Shen KM. Absence of 3a 0 charge density wave order in the infinite-layer nickelate NdNiO 2. Nat Mater 2024; 23:486-491. [PMID: 38278983 PMCID: PMC10990928 DOI: 10.1038/s41563-024-01797-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Accepted: 01/03/2024] [Indexed: 01/28/2024]
Abstract
A hallmark of many unconventional superconductors is the presence of many-body interactions that give rise to broken-symmetry states intertwined with superconductivity. Recent resonant soft X-ray scattering experiments report commensurate 3a0 charge density wave order in infinite-layer nickelates, which has important implications regarding the universal interplay between charge order and superconductivity in both cuprates and nickelates. Here we present X-ray scattering and spectroscopy measurements on a series of NdNiO2+x samples, which reveal that the signatures of charge density wave order are absent in fully reduced, single-phase NdNiO2. The 3a0 superlattice peak instead originates from a partially reduced impurity phase where excess apical oxygens form ordered rows with three-unit-cell periodicity. The absence of any observable charge density wave order in NdNiO2 highlights a crucial difference between the phase diagrams of cuprate and nickelate superconductors.
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Grants
- DE-SC0019414 U.S. Department of Energy (DOE)
- DE-AC02-05CH11231 U.S. Department of Energy (DOE)
- DE-AC02-06CH11357 U.S. Department of Energy (DOE)
- FA9550-21-1-0168 United States Department of Defense | United States Air Force | AFMC | Air Force Office of Scientific Research (AF Office of Scientific Research)
- DMR-2104427 National Science Foundation (NSF)
- NNCI-2025233 National Science Foundation (NSF)
- GBMF3850 Gordon and Betty Moore Foundation (Gordon E. and Betty I. Moore Foundation)
- GBMF9073 Gordon and Betty Moore Foundation (Gordon E. and Betty I. Moore Foundation)
- Part of the research described in this paper was performed at the Canadian Light Source, a national research facility of the University of Saskatchewan, which is supported by the Canada Foundation for Innovation (CFI), the Natural Sciences and Engineering Research Council (NSERC), the National Research Council (NRC), the Canadian Institutes of Health Research (CIHR), the Government of Saskatchewan, and the University of Saskatchewan.
- The microscopy work at Cornell was supported by the NSF PARADIM, with additional support from Cornell University, the Weill Institute, the Kavli Institute at Cornell, and the Packard Foundation.
- G.H. acknowledges support from Severo Ochoa FUNFUTURE (No. CEX2019-000917-S) of the Spanish Ministry of Science and Innovation and by the Generalitat de Catalunya (2021 SGR 00445).
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Affiliation(s)
- C T Parzyck
- Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY, USA
| | - N K Gupta
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, Canada
| | - Y Wu
- Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY, USA
| | - V Anil
- Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY, USA
| | - L Bhatt
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA
| | - M Bouliane
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, Canada
| | - R Gong
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, Canada
| | - B Z Gregory
- Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY, USA
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, USA
| | - A Luo
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, USA
| | - R Sutarto
- Canadian Light Source, Saskatoon, Saskatchewan, Canada
| | - F He
- Canadian Light Source, Saskatoon, Saskatchewan, Canada
| | - Y-D Chuang
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - T Zhou
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, IL, USA
| | - G Herranz
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Bellaterra, Spain
| | - L F Kourkoutis
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY, USA
| | - A Singer
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, USA
| | - D G Schlom
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, USA
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY, USA
- Leibniz-Institut für Kristallzüchtung, Berlin, Germany
| | - D G Hawthorn
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, Canada
| | - K M Shen
- Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY, USA.
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Bellaterra, Spain.
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY, USA.
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2
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Ferrando C, Carramiñana A, Piñeiro P, Mirabella L, Spadaro S, Librero J, Ramasco F, Scaramuzzo G, Cervantes O, Garutti I, Parera A, Argilaga M, Herranz G, Unzueta C, Vives M, Regi K, Costa-Reverte M, Sonsoles Leal M, Nieves-Alonso J, García E, Rodríguez-Pérez A, Fariña R, Cabrera S, Guerra E, Gallego-Ligorit L, Herrero-Izquierdo A, Vallés-Torres J, Ramos S, López-Herrera D, De La Matta M, Gokhan S, Kucur E, Mugarra A, Soro M, García L, Sastre JA, Aguirre P, Salazar CJ, Ramos MC, Morocho DR, Trespalacios R, Ezequiel-Fernández F, Lamanna A, Pia Cantatore L, Laforgia D, Bellas S, López C, Navarro-Ripoll R, Martínez S, Vallverdú J, Jacas A, Yepes-Temiño MJ, Belda FJ, Tusman G, Suárez-Sipmann F, Villar J. Individualised, perioperative open-lung ventilation strategy during one-lung ventilation (iPROVE-OLV): a multicentre, randomised, controlled clinical trial. Lancet Respir Med 2024; 12:195-206. [PMID: 38065200 DOI: 10.1016/s2213-2600(23)00346-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 09/05/2023] [Accepted: 09/19/2023] [Indexed: 03/02/2024]
Abstract
BACKGROUND It is uncertain whether individualisation of the perioperative open-lung approach (OLA) to ventilation reduces postoperative pulmonary complications in patients undergoing lung resection. We compared a perioperative individualised OLA (iOLA) ventilation strategy with standard lung-protective ventilation in patients undergoing thoracic surgery with one-lung ventilation. METHODS This multicentre, randomised controlled trial enrolled patients scheduled for open or video-assisted thoracic surgery using one-lung ventilation in 25 participating hospitals in Spain, Italy, Turkey, Egypt, and Ecuador. Eligible adult patients (age ≥18 years) were randomly assigned to receive iOLA or standard lung-protective ventilation. Eligible patients (stratified by centre) were randomly assigned online by local principal investigators, with an allocation ratio of 1:1. Treatment with iOLA included an alveolar recruitment manoeuvre to 40 cm H2O of end-inspiratory pressure followed by individualised positive end-expiratory pressure (PEEP) titrated to best respiratory system compliance, and individualised postoperative respiratory support with high-flow oxygen therapy. Participants allocated to standard lung-protective ventilation received combined intraoperative 4 cm H2O of PEEP and postoperative conventional oxygen therapy. The primary outcome was a composite of severe postoperative pulmonary complications within the first 7 postoperative days, including atelectasis requiring bronchoscopy, severe respiratory failure, contralateral pneumothorax, early extubation failure (rescue with continuous positive airway pressure, non-invasive ventilation, invasive mechanical ventilation, or reintubation), acute respiratory distress syndrome, pulmonary infection, bronchopleural fistula, and pleural empyema. Due to trial setting, data obtained in the operating and postoperative rooms for routine monitoring were not blinded. At 24 h, data were acquired by an investigator blinded to group allocation. All analyses were performed on an intention-to-treat basis. This trial is registered with ClinicalTrials.gov, NCT03182062, and is complete. FINDINGS Between Sept 11, 2018, and June 14, 2022, we enrolled 1380 patients, of whom 1308 eligible patients (670 [434 male, 233 female, and three with missing data] assigned to iOLA and 638 [395 male, 237 female, and six with missing data] to standard lung-protective ventilation) were included in the final analysis. The proportion of patients with the composite outcome of severe postoperative pulmonary complications within the first 7 postoperative days was lower in the iOLA group compared with the standard lung-protective ventilation group (40 [6%] vs 97 [15%], relative risk 0·39 [95% CI 0·28 to 0·56]), with an absolute risk difference of -9·23 (95% CI -12·55 to -5·92). Recruitment manoeuvre-related adverse events were reported in five patients. INTERPRETATION Among patients subjected to lung resection under one-lung ventilation, iOLA was associated with a reduced risk of severe postoperative pulmonary complications when compared with conventional lung-protective ventilation. FUNDING Instituto de Salud Carlos III and the European Regional Development Funds.
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Affiliation(s)
- Carlos Ferrando
- Institut D'investigació August Pi I Sunyer, Barcelona, Spain; CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, Spain.
| | - Albert Carramiñana
- Department of Anesthesiology and Critical Care, Hospital Clinic de Barcelona, Barcelona, Spain
| | - Patricia Piñeiro
- Department of Anesthesiology and Critical Care, Hospital Universitario Gregorio Marañón, Madrid, Spain
| | - Lucia Mirabella
- Department of Medical and Surgical Sciences, Università Degli Studi di Foggia, Foggia, Italy
| | - Savino Spadaro
- Department of Anesthesiology and Critical Care, Azienda Ospedaliero-Universitaria di Ferrara, Ferrara, Italy
| | - Julián Librero
- UPNA, REDISSEC Red de Investigación en Servicios de Salud, Navarrabiomed, Complejo Hospitalario de Navarra, Pamplona, Spain
| | - Fernando Ramasco
- Department of Anesthesiology and Critical Care, Hospital Universitario de La Princesa, Madrid, Spain
| | - Gaetano Scaramuzzo
- Department of Anesthesiology and Critical Care, Azienda Ospedaliero-Universitaria di Ferrara, Ferrara, Italy
| | - Oriol Cervantes
- Department of Anesthesiology and Critical Care, Hospital Universitario Germans Trías i Pujol, Barcelona, Spain
| | - Ignacio Garutti
- Department of Anesthesiology and Critical Care, Hospital Universitario Gregorio Marañón, Madrid, Spain
| | - Ana Parera
- Department of Anesthesiology and Critical Care, Hospital Universitario Santa Creu i Sant Pau, Barcelona, Spain
| | - Marta Argilaga
- Department of Anesthesiology and Critical Care, Hospital Universitario Santa Creu i Sant Pau, Barcelona, Spain
| | - Gracia Herranz
- Department of Anesthesiology and Critical Care, Hospital Universitario Santa Creu i Sant Pau, Barcelona, Spain
| | - Carmen Unzueta
- Department of Anesthesiology and Critical Care, Hospital Universitario Santa Creu i Sant Pau, Barcelona, Spain
| | - Marc Vives
- Department of Anesthesiology and Critical Care, Hospital Universitario Josep Trueta, Girona, Spain
| | - Kevin Regi
- Department of Anesthesiology and Critical Care, Hospital Universitario Josep Trueta, Girona, Spain
| | - Marta Costa-Reverte
- Department of Anesthesiology and Critical Care, Hospital Universitario de Bellvitge, Barcelona, Spain
| | | | - Jesús Nieves-Alonso
- Department of Anesthesiology and Critical Care, Hospital Universitario de La Princesa, Madrid, Spain
| | - Esther García
- Department of Anesthesiology and Critical Care, Hospital Universitario de La Princesa, Madrid, Spain
| | - Aurelio Rodríguez-Pérez
- Department of Anesthesiology and Critical Care, Hospital Universitario de Gran Canaria Dr Negrín, Gran Canarias, Spain
| | - Roberto Fariña
- Department of Anesthesiology and Critical Care, Hospital Universitario de Gran Canaria Dr Negrín, Gran Canarias, Spain
| | - Sergio Cabrera
- Department of Anesthesiology and Critical Care, Hospital Universitario de Gran Canaria Dr Negrín, Gran Canarias, Spain
| | - Elisabeth Guerra
- Department of Anesthesiology and Critical Care, Hospital Universitario de Gran Canaria Dr Negrín, Gran Canarias, Spain
| | - Lucia Gallego-Ligorit
- Department of Anesthesiology and Critical Care, Hospital Universitario Miguel Servet, Zaragoza, Spain; Instituto de Investigación Sanitaria Aragón IIS Aragón, Zaragoza, Spain
| | - Alba Herrero-Izquierdo
- Department of Anesthesiology and Critical Care, Hospital Universitario Miguel Servet, Zaragoza, Spain; Instituto de Investigación Sanitaria Aragón IIS Aragón, Zaragoza, Spain
| | - J Vallés-Torres
- Department of Anesthesiology and Critical Care, Hospital Universitario Miguel Servet, Zaragoza, Spain; Instituto de Investigación Sanitaria Aragón IIS Aragón, Zaragoza, Spain
| | - Silvia Ramos
- Department of Anesthesiology and Critical Care, Hospital Universitario Gregorio Marañón, Madrid, Spain
| | - Daniel López-Herrera
- Department of Anesthesiology and Critical Care, Hospital Universitario Virgen del Rocío, Sevilla, Spain
| | - Manuel De La Matta
- Department of Anesthesiology and Critical Care, Hospital Universitario Virgen del Rocío, Sevilla, Spain
| | - Sertcakacilar Gokhan
- Department of Anesthesiology and Critical Care, Bakirkoy Dr Sadi Konuk Training and Research Hospital, Istanbul, Turkey; Outcomes Research Consortium, Cleveland, OH, USA
| | - Evrim Kucur
- Department of Anesthesiology and Critical Care, Bakirkoy Dr Sadi Konuk Training and Research Hospital, Istanbul, Turkey
| | - Ana Mugarra
- Department of Anesthesiology and Critical Care, Hospital Universitario Clínico de Valencia, Valencia, Spain
| | - Marina Soro
- Department of Anesthesiology and Critical Care, Hospital Universitario Clínico de Valencia, Valencia, Spain
| | - Laura García
- Department of Anesthesiology and Critical Care, Hospital Universitario Clínico de Valencia, Valencia, Spain
| | - José Alfonso Sastre
- Department of Anesthesiology and Critical Care, Hospital Universitario de Salamanca, Salamanca, Spain
| | - Pilar Aguirre
- Department of Anesthesiology and Critical Care, Hospital Álvaro Cunqueiro, Vigo, Spain
| | - Claudia Jimena Salazar
- Department of Anesthesiology and Critical Care, Hospital Universitario Ntra Sra de Candelaria, Santa Cruz de Tenerife, Spain
| | - María Carolina Ramos
- Department of Anesthesiology and Critical Care, Hospital Universitario Ntra Sra de Candelaria, Santa Cruz de Tenerife, Spain
| | | | - Ramón Trespalacios
- Department of Anesthesiology and Critical Care, Hospital Universitario Central de Asturias, Oviedo, Spain
| | - Félix Ezequiel-Fernández
- Department of Anesthesiology and Critical Care, Hospital Universitario Central de Asturias, Oviedo, Spain
| | - Angella Lamanna
- Department of Medical and Surgical Sciences, Università Degli Studi di Foggia, Foggia, Italy
| | - Leonarda Pia Cantatore
- Department of Medical and Surgical Sciences, Università Degli Studi di Foggia, Foggia, Italy
| | - Donato Laforgia
- Department of Medical and Surgical Sciences, Università Degli Studi di Foggia, Foggia, Italy
| | - Soledad Bellas
- Department of Anesthesiology and Critical Care, Hospital Universitario Fundación Jiménez Díaz, Madrid, Spain
| | - Carlos López
- Department of Anesthesiology and Critical Care, Hospital Universitario Marques de Valdecilla, Santander, Spain
| | - Ricard Navarro-Ripoll
- Department of Anesthesiology and Critical Care, Hospital Clinic de Barcelona, Barcelona, Spain
| | - Samira Martínez
- Department of Anesthesiology and Critical Care, Hospital Universitario Gregorio Marañón, Madrid, Spain
| | - Jordi Vallverdú
- Department of Anesthesiology and Critical Care, Hospital Clinic de Barcelona, Barcelona, Spain
| | - Adriana Jacas
- Department of Anesthesiology and Critical Care, Hospital Clinic de Barcelona, Barcelona, Spain
| | - María José Yepes-Temiño
- Department of Anesthesiology and Critical Care, Clínica Universidad de Navarra, Pamplona, Spain
| | - Francisco Javier Belda
- Department of Anesthesiology and Critical Care, Hospital Universitario Clínico de Valencia, Valencia, Spain
| | - Gerardo Tusman
- Department of Anesthesiology, Hospital Privado de Comunidad, Mar de Plata, Buenos Aires, Argentina
| | - Fernando Suárez-Sipmann
- CIBER de Enfermedades Respiratorias CIBERES, Instituto de Salud Carlos III, Madrid, Spain; Hedenstierna Laboratory, Department of Surgical Sciences, Uppsala University, Uppsala, Sweden
| | - Jesús Villar
- CIBER de Enfermedades Respiratorias, Madrid, Spain; Hospital Universitario Dr Negrín, Las Palmas de Gran Canaria, Spain; Li Ka Shing Knowledge Institute for Medical Science, St Michael's Hospital, Toronto, ON, Canada
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Parzyck CT, Gupta NK, Wu Y, Anil V, Bhatt L, Bouliane M, Gong R, Gregory BZ, Luo A, Sutarto R, He F, Chuang YD, Zhou T, Herranz G, Kourkoutis LF, Singer A, Schlom DG, Hawthorn DG, Shen KM. Publisher Correction: Absence of 3a 0 charge density wave order in the infinite-layer nickelate NdNiO 2. Nat Mater 2024; 23:440. [PMID: 38347120 PMCID: PMC10917676 DOI: 10.1038/s41563-024-01832-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/15/2024]
Affiliation(s)
- C T Parzyck
- Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY, USA
| | - N K Gupta
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, Canada
| | - Y Wu
- Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY, USA
| | - V Anil
- Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY, USA
| | - L Bhatt
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA
| | - M Bouliane
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, Canada
| | - R Gong
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, Canada
| | - B Z Gregory
- Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY, USA
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, USA
| | - A Luo
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, USA
| | - R Sutarto
- Canadian Light Source, Saskatoon, Saskatchewan, Canada
| | - F He
- Canadian Light Source, Saskatoon, Saskatchewan, Canada
| | - Y-D Chuang
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - T Zhou
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, IL, USA
| | - G Herranz
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Bellaterra, Spain
| | - L F Kourkoutis
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY, USA
| | - A Singer
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, USA
| | - D G Schlom
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, USA
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY, USA
- Leibniz-Institut für Kristallzüchtung, Berlin, Germany
| | - D G Hawthorn
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, Canada
| | - K M Shen
- Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY, USA.
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Bellaterra, Spain.
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY, USA.
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Singh G, Jouan A, Herranz G, Scigaj M, Sánchez F, Benfatto L, Caprara S, Grilli M, Saiz G, Couëdo F, Feuillet-Palma C, Lesueur J, Bergeal N. Gap suppression at a Lifshitz transition in a multi-condensate superconductor. Nat Mater 2019; 18:948-954. [PMID: 31086324 DOI: 10.1038/s41563-019-0354-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Accepted: 03/21/2019] [Indexed: 06/09/2023]
Abstract
In multi-orbital materials, superconductivity can exhibit several coupled condensates. In this context, quantum confinement in two-dimensional superconducting oxide interfaces offers new degrees of freedom to engineer the band structure and selectively control the occupancy of 3d orbitals by electrostatic doping. Here, we use resonant microwave transport to extract the superfluid stiffness of the (110)-oriented LaAlO3/SrTiO3 interface in the entire phase diagram. We provide evidence of a transition from single-condensate to two-condensate superconductivity driven by continuous and reversible electrostatic doping, which we relate to the Lifshitz transition between 3d bands based on numerical simulations of the quantum well. We find that the superconducting gap is suppressed while the second band is populated, challenging Bardeen-Cooper-Schrieffer theory. We ascribe this behaviour to the existence of superconducting order parameters with opposite signs in the two condensates due to repulsive coupling. Our findings offer an innovative perspective on the possibility to tune and control multiple-orbital physics in superconducting interfaces.
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Affiliation(s)
- G Singh
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI Paris, PSL Research University, CNRS, Paris, France
- Université Pierre and Marie Curie, Sorbonne-Université, Paris, France
| | - A Jouan
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI Paris, PSL Research University, CNRS, Paris, France
- Université Pierre and Marie Curie, Sorbonne-Université, Paris, France
| | - G Herranz
- Institut de Ciéncia de Materials de Barcelona (ICMAB-CSIC), Campus de la UAB, Bellaterra, Catalonia, Spain
| | - M Scigaj
- Institut de Ciéncia de Materials de Barcelona (ICMAB-CSIC), Campus de la UAB, Bellaterra, Catalonia, Spain
| | - F Sánchez
- Institut de Ciéncia de Materials de Barcelona (ICMAB-CSIC), Campus de la UAB, Bellaterra, Catalonia, Spain
| | - L Benfatto
- Institute for Complex Systems (ISC-CNR), UOS Sapienza, Roma, Italy
- Dipartimento di Fisica Università di Roma 'La Sapienza', Roma, Italy
| | - S Caprara
- Institute for Complex Systems (ISC-CNR), UOS Sapienza, Roma, Italy
- Dipartimento di Fisica Università di Roma 'La Sapienza', Roma, Italy
| | - M Grilli
- Institute for Complex Systems (ISC-CNR), UOS Sapienza, Roma, Italy
- Dipartimento di Fisica Università di Roma 'La Sapienza', Roma, Italy
| | - G Saiz
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI Paris, PSL Research University, CNRS, Paris, France
- Université Pierre and Marie Curie, Sorbonne-Université, Paris, France
| | - F Couëdo
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI Paris, PSL Research University, CNRS, Paris, France
- Université Pierre and Marie Curie, Sorbonne-Université, Paris, France
| | - C Feuillet-Palma
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI Paris, PSL Research University, CNRS, Paris, France
- Université Pierre and Marie Curie, Sorbonne-Université, Paris, France
| | - J Lesueur
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI Paris, PSL Research University, CNRS, Paris, France
- Université Pierre and Marie Curie, Sorbonne-Université, Paris, France
| | - N Bergeal
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI Paris, PSL Research University, CNRS, Paris, France.
- Université Pierre and Marie Curie, Sorbonne-Université, Paris, France.
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5
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Gazquez J, Stengel M, Mishra R, Scigaj M, Varela M, Roldan MA, Fontcuberta J, Sánchez F, Herranz G. Competition between Polar and Nonpolar Lattice Distortions in Oxide Quantum Wells: New Critical Thickness at Polar Interfaces. Phys Rev Lett 2017; 119:106102. [PMID: 28949171 DOI: 10.1103/physrevlett.119.106102] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Indexed: 05/13/2023]
Abstract
Two basic lattice distortions permeate the structural phase diagram of oxide perovskites: antiferrodistortive (AFD) rotations and tilts of the oxygen octahedral network and polar ferroelectric modes. With some notable exceptions, these two order parameters rarely coexist in a bulk crystal, and understanding their competition is a lively area of active research. Here we demonstrate, by using the LaAlO_{3}/SrTiO_{3} system as a test case, that quantum confinement can be a viable tool to shift the balance between AFD and polar modes and selectively stabilize one of the two phases. By combining scanning transmission electron microscopy (STEM) and first-principles-based models, we find a crossover between a bulklike LaAlO_{3} structure where AFD rotations prevail, to a strongly polar state with no AFD tilts at a thickness of approximately three unit cells; therefore, in addition to the celebrated electronic reconstruction, our work unveils a second critical thickness, related not to the electronic properties but to the structural ones. We discuss the implications of these findings, both for the specifics of the LaAlO_{3}/SrTiO_{3} system and for the general quest towards nanoscale control of material properties.
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Affiliation(s)
- J Gazquez
- Institut de Ciència de Materials de Barcelona, Campus de la UAB, 08193 Bellaterra, Spain
| | - M Stengel
- Institut de Ciència de Materials de Barcelona, Campus de la UAB, 08193 Bellaterra, Spain
- ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Spain
| | - R Mishra
- Department of Mechanical Engineering and Materials Science, Washington University in St. Louis, St. Louis, Missouri 63130, USA
| | - M Scigaj
- Institut de Ciència de Materials de Barcelona, Campus de la UAB, 08193 Bellaterra, Spain
| | - M Varela
- Materials Science and Technology Division, Oak Ridge National Laboratory, Tennessee 37831-6071, USA
- Departamento de Física de Materiales and Instituto Pluridisciplinar, Universidad Complutense de Madrid, Madrid 28040, Spain
| | - M A Roldan
- Departamento de Física de Materiales and Instituto Pluridisciplinar, Universidad Complutense de Madrid, Madrid 28040, Spain
| | - J Fontcuberta
- Institut de Ciència de Materials de Barcelona, Campus de la UAB, 08193 Bellaterra, Spain
| | - F Sánchez
- Institut de Ciència de Materials de Barcelona, Campus de la UAB, 08193 Bellaterra, Spain
| | - G Herranz
- Institut de Ciència de Materials de Barcelona, Campus de la UAB, 08193 Bellaterra, Spain
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6
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López-Conesa L, Rebled JM, Pesquera D, Dix N, Sánchez F, Herranz G, Fontcuberta J, Magén C, Casanove MJ, Estradé S, Peiró F. Evidence of a minority monoclinic LaNiO2.5 phase in lanthanum nickelate thin films. Phys Chem Chem Phys 2017; 19:9137-9142. [DOI: 10.1039/c7cp00902j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
LaNiO3 (LNO) thin films of 14 nm and 35 nm thicknesses grown epitaxially on LaAlO3 (LAO) and (LaAlO3)0.3(Sr2TaAlO6)0.7 (LSAT) substrates are studied using High Resolution Transmission Electron Microscopy (HRTEM) and High Angle Annular Dark Field (HAADF) imaging.
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Iglesias B, Rodríguez M, Aleo E, Criado E, Herranz G, Moro M, Martínez Orgado J, Arruza L. Pulsioximetría frente al monitor de electrocardiograma para la determinación de la frecuencia cardíaca durante la reanimación del recién nacido pretérmino. An Pediatr (Barc) 2016; 84:271-7. [DOI: 10.1016/j.anpedi.2015.08.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Revised: 08/05/2015] [Accepted: 08/14/2015] [Indexed: 11/28/2022] Open
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8
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Iglesias B, Rodríguez M, Aleo E, Criado E, Herranz G, Moro M, Martínez Orgado J, Arruza L. Pulse oximetry versus electrocardiogram for heart rate assessment during resuscitation of the preterm infant. An Pediatr (Barc) 2016. [DOI: 10.1016/j.anpede.2015.08.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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9
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Pesquera D, Scigaj M, Gargiani P, Barla A, Herrero-Martín J, Pellegrin E, Valvidares SM, Gázquez J, Varela M, Dix N, Fontcuberta J, Sánchez F, Herranz G. Two-dimensional electron gases at LaAlO3/SrTiO3 interfaces: orbital symmetry and hierarchy engineered by crystal orientation. Phys Rev Lett 2014; 113:156802. [PMID: 25375731 DOI: 10.1103/physrevlett.113.156802] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Indexed: 06/04/2023]
Abstract
Recent findings show the emergence of two-dimensional electron gases (2DEGs) at LaAlO(3)/SrTiO(3) interfaces along different orientations; yet details on band reconstructions have remained so far unknown. Via x-ray linear dichroism spectroscopy, we demonstrate that crystal symmetry imposes distinctive 2DEG orbital hierarchies on (001)-and (110)-oriented quantum wells, allowing selective occupancy of states of different symmetry. Such orientational tuning expands the possibilities for electronic engineering of 2DEGs and opens up enticing opportunities to understand the link between orbital symmetry and complex correlated states at LaAlO(3)/SrTiO(3) quantum wells.
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Affiliation(s)
- D Pesquera
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus de la UAB, Bellaterra E-08193, Catalonia, Spain
| | - M Scigaj
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus de la UAB, Bellaterra E-08193, Catalonia, Spain and Departamento de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Barcelona, Catalonia, Spain
| | - P Gargiani
- ALBA Synchrotron Light Source, Carretera BP 1413 km 3.3, E-08290 Cerdanyola del Vallès, Barcelona, Spain
| | - A Barla
- Istituto di Struttura della Materia, ISM CNR, Area Science Park Basovizza (Ts), Trieste I-34149, Italy
| | - J Herrero-Martín
- ALBA Synchrotron Light Source, Carretera BP 1413 km 3.3, E-08290 Cerdanyola del Vallès, Barcelona, Spain
| | - E Pellegrin
- ALBA Synchrotron Light Source, Carretera BP 1413 km 3.3, E-08290 Cerdanyola del Vallès, Barcelona, Spain
| | - S M Valvidares
- ALBA Synchrotron Light Source, Carretera BP 1413 km 3.3, E-08290 Cerdanyola del Vallès, Barcelona, Spain
| | - J Gázquez
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus de la UAB, Bellaterra E-08193, Catalonia, Spain
| | - M Varela
- Departamento Física Aplicada III, Universidad Complutense de Madrid, Madrid, 28040 Spain and Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - N Dix
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus de la UAB, Bellaterra E-08193, Catalonia, Spain
| | - J Fontcuberta
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus de la UAB, Bellaterra E-08193, Catalonia, Spain
| | - F Sánchez
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus de la UAB, Bellaterra E-08193, Catalonia, Spain
| | - G Herranz
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus de la UAB, Bellaterra E-08193, Catalonia, Spain
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Herranz G. WITHDRAWN: Response: The timing of monozygotic twinning: a pro-life challenge to conventional scientific wisdom. Reprod Biomed Online 2014. [DOI: 10.1016/j.rbmo.2014.04.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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12
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Herranz G, Romero A, de Castro V, Rodríguez G. Processing of AISI M2 high speed steel reinforced with vanadium carbide by solar sintering. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.matdes.2013.09.027] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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13
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Pesquera D, Herranz G, Barla A, Pellegrin E, Bondino F, Magnano E, Sánchez F, Fontcuberta J. Surface symmetry-breaking and strain effects on orbital occupancy in transition metal perovskite epitaxial films. Nat Commun 2013; 3:1189. [PMID: 23149734 DOI: 10.1038/ncomms2189] [Citation(s) in RCA: 91] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2012] [Accepted: 10/04/2012] [Indexed: 11/09/2022] Open
Abstract
The electron occupancy of 3d-orbitals determines the properties of transition metal oxides. This can be achieved, for example, through thin-film heterostructure engineering of ABO(3) oxides, enabling emerging properties at interfaces. Interestingly, epitaxial strain may break the degeneracy of 3d-e(g) and t(2g) orbitals, thus favoring a particular orbital filling with consequences for functional properties. Here we disclose the effects of symmetry breaking at free surfaces of ABO(3) perovskite epitaxial films and show that it can be combined with substrate-induced epitaxial strain to tailor at will the electron occupancy of in-plane and out-of-plane surface electronic orbitals. We use X-ray linear dichroism to monitor the relative contributions of surface, strain and atomic terminations to the occupancy of 3z(2)-r(2) and x(2)-y(2) orbitals in La(2/3)Sr(1/3)MnO(3) films. These findings open the possibility of an active tuning of surface electronic and magnetic properties as well as chemical properties (catalytic reactivity, wettability and so on).
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Affiliation(s)
- D Pesquera
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra 08193, Spain
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Laukhin V, Copie O, Rozenberg MJ, Weht R, Bouzehouane K, Reyren N, Jacquet E, Bibes M, Barthélémy A, Herranz G. Electronic subband reconfiguration in a d0-perovskite induced by strain-driven structural transformations. Phys Rev Lett 2012; 109:226601. [PMID: 23368143 DOI: 10.1103/physrevlett.109.226601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Revised: 06/19/2012] [Indexed: 06/01/2023]
Abstract
It is well known that transport in lightly n-doped SrTiO(3) involves light and heavy electron bands. We have found that upon application of moderate quasi-isotropic pressures, the relative positions of these subbands are changed by a few meV and, eventually, a band inversion occurs at ~1 kbar. Such effects are, however, suppressed in the closely related KTaO(3) perovskite. We show that the extremely subtle electronic reconfiguration in SrTiO(3) is triggered by strain-induced structural transformations that are accompanied by remarkable mobility enhancements up to about Δμ/μ≈300%. Our results provide a microscopic rationale for the recently discovered transport enhancement under strain and underscore the role of the internal structural degrees of freedom in the modulation of the perovskite electronic properties.
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Affiliation(s)
- V Laukhin
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus de la UAB, Bellaterra 08193, Catalonia, Spain
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Herranz G, Sánchez F, Dix N, Scigaj M, Fontcuberta J. High mobility conduction at (110) and (111) LaAlO3/SrTiO3 interfaces. Sci Rep 2012; 2:758. [PMID: 23091698 PMCID: PMC3477651 DOI: 10.1038/srep00758] [Citation(s) in RCA: 151] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2012] [Accepted: 09/21/2012] [Indexed: 11/09/2022] Open
Abstract
In recent years, striking discoveries have revealed that two-dimensional electron liquids (2DEL) confined at the interface between oxide band-insulators can be engineered to display a high mobility transport. The recognition that only few interfaces appear to suit hosting 2DEL is intriguing and challenges the understanding of these emerging properties not existing in bulk. Indeed, only the neutral TiO(2) surface of (001)SrTiO(3) has been shown to sustain 2DEL. We show that this restriction can be surpassed: (110) and (111) surfaces of SrTiO(3) interfaced with epitaxial LaAlO(3) layers, above a critical thickness, display 2DEL transport with mobilities similar to those of (001)SrTiO(3). Moreover we show that epitaxial interfaces are not a prerequisite: conducting (110) interfaces with amorphous LaAlO(3) and other oxides can also be prepared. These findings open a new perspective both for materials research and for elucidating the ultimate microscopic mechanism of carrier doping.
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Affiliation(s)
- G Herranz
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus de la UAB, Bellaterra 08193, Catalonia, Spain.
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Rubio-Roy M, Vlasin O, Pascu O, Caicedo JM, Schmidt M, Goñi AR, Tognalli NG, Fainstein A, Roig A, Herranz G. Magneto-optical enhancement by plasmon excitations in nanoparticle/metal structures. Langmuir 2012; 28:9010-9020. [PMID: 22594822 DOI: 10.1021/la301239x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Coupling magnetic materials to plasmonic structures provides a pathway to dramatically increase the magneto-optical response of the resulting composite architecture. Although such optical enhancement has been demonstrated in a variety of systems, some basic aspects are scarcely known. In particular, reflectance/transmission modulations and electromagnetic field intensification, both triggered by plasmon excitations, can contribute to the magneto-optical enhancement. However, a quantitative evaluation of the impact of both factors on the magneto-optical response is lacking. To address this issue, we have measured magneto-optical Kerr spectra on corrugated gold/dielectric interfaces with magnetic (nickel and iron oxide) nanoparticles. We find that the magneto-optical activity is enhanced by up to an order of magnitude for wavelengths that are correlated to the excitation of propagating or localized surface plasmons. Our work sheds light on the fundamental principles for the observed optical response and demonstrates that the outstanding magneto-optical performance is originated by the increase of the polarization conversion efficiency, whereas the contribution of reflectance modulations is negligible.
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Affiliation(s)
- M Rubio-Roy
- Institut de Ciència de Materials de Barcelona ICMAB-CSIC, Campus de la UAB, 08193 Bellaterra, Catalonia, Spain
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Dubroka A, Rössle M, Kim KW, Malik VK, Schultz L, Thiel S, Schneider CW, Mannhart J, Herranz G, Copie O, Bibes M, Barthélémy A, Bernhard C. Dynamical response and confinement of the electrons at the LaAlO3/SrTiO3 interface. Phys Rev Lett 2010; 104:156807. [PMID: 20482010 DOI: 10.1103/physrevlett.104.156807] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2009] [Indexed: 05/29/2023]
Abstract
With infrared ellipsometry and transport measurements we investigated the electrons at the interface between LaAlO3 and SrTiO3. We obtained a sheet carrier concentration of N(s) approximately = 5-9x10(13) cm(-2), an effective mass of m*=3.2+/-0.4m(e), and a strongly frequency dependent mobility. The latter are similar as in bulk SrTi(1-x)Nb(x)O3 and therefore suggestive of polaronic correlations. We also determined the vertical concentration profile which has a strongly asymmetric shape with a rapid initial decay over the first 2 nm and a pronounced tail that extends to about 11 nm.
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Affiliation(s)
- A Dubroka
- University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Chemin du Musée 3, CH-1700 Fribourg, Switzerland
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18
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Copie O, Rode K, Mattana R, Bibes M, Cros V, Herranz G, Anane A, Ranchal R, Jacquet E, Bouzehouane K, Arrio MA, Bencok P, Brookes NB, Petroff F, Barthélémy A. Structural and magnetic properties of Co-doped (La,Sr)TiO(3) epitaxial thin films probed using x-ray magnetic circular dichroism. J Phys Condens Matter 2009; 21:406001. [PMID: 21832426 DOI: 10.1088/0953-8984/21/40/406001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We report a study of Co-doped La(0.37)Sr(0.63)TiO(3-δ) thin films grown by pulsed laser deposition in various oxygen pressure conditions. X-ray absorption spectroscopy and magnetic circular dichroism measurements at the Co L(2,3) edges reveal that the cobalt mainly substitutes for the titanium and is in an ionic state. Nevertheless, in some films, indications of additional cobalt metallic impurities were found, suggesting that the intrinsic character of this magnetic system remains questionable.
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Affiliation(s)
- O Copie
- Unité Mixte de Physique CNRS/Thales, Campus de l'Ecole Polytechnique, 1 Avenue A Fresnel, 91767 Palaiseau, France and Université Paris-Sud 11, 91405 Orsay, France
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Copie O, Garcia V, Bödefeld C, Carrétéro C, Bibes M, Herranz G, Jacquet E, Maurice JL, Vinter B, Fusil S, Bouzehouane K, Jaffrès H, Barthélémy A. Towards two-dimensional metallic behavior at LaAlO3/SrTiO3 interfaces. Phys Rev Lett 2009; 102:216804. [PMID: 19519126 DOI: 10.1103/physrevlett.102.216804] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2009] [Indexed: 05/27/2023]
Abstract
Using a low-temperature conductive-tip atomic force microscope in cross-section geometry we have characterized the local transport properties of the metallic electron gas that forms at the interface between LaAlO3 and SrTiO3. At low temperature, we find that the carriers do not spread away from the interface but are confined within approximately 10 nm, just like at room temperature. Simulations taking into account both the large temperature and electric-field dependence of the permittivity of SrTiO3 predict a confinement over a few nm for sheet carrier densities larger than approximately 6x10(13) cm(-2). We discuss the experimental and simulations results in terms of a multiband carrier system. Remarkably, the Fermi wavelength estimated from Hall measurements is approximately 16 nm, indicating that the electron gas in on the verge of two dimensionality.
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Affiliation(s)
- O Copie
- Unité Mixte de Physique CNRS/Thales, Campus de l'Ecole Polytechnique, 1 Av. A. Fresnel, 91767 Palaiseau, France
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Basletic M, Maurice JL, Carrétéro C, Herranz G, Copie O, Bibes M, Jacquet E, Bouzehouane K, Fusil S, Barthélémy A. Mapping the spatial distribution of charge carriers in LaAlO3/SrTiO3 heterostructures. Nat Mater 2008; 7:621-5. [PMID: 18587402 DOI: 10.1038/nmat2223] [Citation(s) in RCA: 114] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2007] [Accepted: 05/27/2008] [Indexed: 05/07/2023]
Abstract
At the interface between complex insulating oxides, novel phases with interesting properties may occur, such as the metallic state reported in the LaAlO(3)/SrTiO(3) system . Although this state has been predicted and reported to be confined at the interface, some studies indicate a much broader spatial extension, thereby questioning its origin. Here, we provide for the first time a direct determination of the carrier density profile of this system through resistance profile mappings collected in cross-section LaAlO(3)/SrTiO(3) samples with a conducting-tip atomic force microscope (CT-AFM). We find that, depending on specific growth protocols, the spatial extension of the high-mobility electron gas can be varied from hundreds of micrometres into SrTiO(3) to a few nanometres next to the LaAlO(3)/SrTiO(3) interface. Our results emphasize the potential of CT-AFM as a novel tool to characterize complex oxide interfaces and provide us with a definitive and conclusive way to reconcile the body of experimental data in this system.
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Affiliation(s)
- M Basletic
- Unité Mixte de Physique CNRS/Thales, Associée à l'Université Paris-Sud, Route départementale 128, 91767 Palaiseau Cedex, France
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Herranz G, Basletić M, Bibes M, Carrétéro C, Tafra E, Jacquet E, Bouzehouane K, Deranlot C, Hamzić A, Broto JM, Barthélémy A, Fert A. High mobility in LaAlO3/SrTiO3 heterostructures: origin, dimensionality, and perspectives. Phys Rev Lett 2007; 98:216803. [PMID: 17677799 DOI: 10.1103/physrevlett.98.216803] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2007] [Indexed: 05/16/2023]
Abstract
We have investigated the dimensionality and origin of the magnetotransport properties of LaAlO3 films epitaxially grown on TiO2-terminated SrTiO3(001) substrates. High-mobility conduction is observed at low deposition oxygen pressures (P(O2)<10(-5) mbar) and has a three-dimensional character. However, at higher P(O2) the conduction is dramatically suppressed and nonmetallic behavior appears. Experimental data strongly support an interpretation of these properties based on the creation of oxygen vacancies in the SrTiO3 substrates during the growth of the LaAlO3 layer. When grown on SrTiO3 substrates at low P(O2), other oxides generate the same high mobility as LaAlO3 films. This opens interesting prospects for all-oxide electronics.
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Affiliation(s)
- G Herranz
- Unité Mixte de Physique CNRS/Thales, Route Départementale 128, 91767 Palaiseau, France.
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Sánchez F, Herranz G, Infante I, Ferrater C, García-Cuenca M, Varela M, Fontcuberta J. Growth modes and self-organization in the epitaxy of ferromagnetic SrRuO3 on SrTiO3(001). PROG SOLID STATE CH 2006. [DOI: 10.1016/j.progsolidstchem.2005.11.034] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Herranz G, Ranchal R, Bibes M, Jaffrès H, Jacquet E, Maurice JL, Bouzehouane K, Wyczisk F, Tafra E, Basletic M, Hamzic A, Colliex C, Contour JP, Barthélémy A, Fert A. Co-doped (La, Sr)TiO(3-delta) : a high Curie temperature diluted magnetic system with large spin polarization. Phys Rev Lett 2006; 96:027207. [PMID: 16486628 DOI: 10.1103/physrevlett.96.027207] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2005] [Indexed: 05/06/2023]
Abstract
We report on tunneling magnetoresistance (TMR) experiments that demonstrate the existence of a significant spin polarization in Co-doped (La, Sr)TiO(3-delta) (Co-LSTO), a ferromagnetic diluted magnetic oxide system (DMOS) with high Curie temperature. These TMR experiments have been performed on magnetic tunnel junctions associating Co-LSTO and Co electrodes. Extensive structural analysis of Co-LSTO combining high-resolution transmission electron microscopy and Auger electron spectroscopy excluded the presence of Co clusters in the Co-LSTO layer and thus, the measured ferromagnetism and high spin polarization are intrinsic properties of this DMOS. Our results argue for the DMOS approach with complex oxide materials in spintronics.
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Affiliation(s)
- G Herranz
- Unité Mixte de Physique CNRS/Thales, Route départementale 128, 91767 Palaiseau Cedex, France
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Herranz G. [Medical ethics and Alzheimer patients]. Rev Med Univ Navarra 2003; 47:37-8. [PMID: 14635416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/27/2023]
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Herranz G. [Euthanasia--prescriptions and proscriptions of assistance in dying]. Med Klin (Munich) 1994; 89:216-21. [PMID: 8015538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- G Herranz
- Dep. de Bioética, Universidad de Navarra, Pamplona
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Herranz G. RU-486: the "abortion pill". Origins 1991; 21:28-33. [PMID: 16145821] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
A report sent by the Vatican to bishops' conferences throughout the world calls RU-486, the so-called abortion pill currently available in France, "a new, serious threat to human life." The report was developed at the Vatican's request by Gonzalo Herranz, a Spanish bioethicist. A cover letter to bishops' conferences from Cardinal Alfonso Lopez Trujillo, president of the Pontifical Council for the Family, suggested that the report be used "to resist the introduction of the abortion pill RU-486 into your country." Related to TU-486 and to new terminology some use to characterize its non-surgical approach to abortion is an intention "to amoralize and thereby place the transmission of human life into an ethically neutral terrain and reduce it to pure biology," says the report. The report discusses possible future uses of RU-486 as a contraceptive, stating: "Women would no longer have to worry themselves about whether they have conceived or not. Each month they would proceed to clean out their uterus chemically." The report refers to RU-486 as "a technical step forward in an area that did not need it." It says, "The abortion pill favors a woman's privacy and secret, but it condemns her to solitude." The English text from the Vatican follows.
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Herranz G. Medical requirements in data protection. Stud Health Technol Inform 1990; 1:71-9. [PMID: 10164080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Affiliation(s)
- G Herranz
- Department of Bioethics, School of Medicine, University of Navarra, Pamplona, Spain
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Herranz G. [Important patients and the hospital. Ethical problems derived from the notoriety of the patients]. Med Clin (Barc) 1988; 91:499-501. [PMID: 3226201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Herranz G. [Bibliographic references: better few and good than many and inappropriate]. Med Clin (Barc) 1988; 91:452-3. [PMID: 3210816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Herranz G. [Discussion or the truth without exaggeration]. Med Clin (Barc) 1988; 90:540-1. [PMID: 3393039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Herranz G. [Results, the heart of the article]. Med Clin (Barc) 1988; 90:500-1. [PMID: 3393033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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33
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Herranz G. [Material and method: basic things told in small print]. Med Clin (Barc) 1987; 88:24l-2. [PMID: 3561060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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34
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Herranz G. [Reasons in favor of using the International System of Units in medicine]. Med Clin (Barc) 1987; 88:19-21. [PMID: 3821248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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35
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Herranz G. [Counting, weighing and measuring]. Med Clin (Barc) 1987; 88:22-4. [PMID: 3821249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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36
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Herranz G. [The concept of 'author']. Med Clin (Barc) 1985; 84:275-6. [PMID: 3982146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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37
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Herranz G. [Style and ethics. The new edition of the standards of the International Committee of Editors of Medical Journals]. Med Clin (Barc) 1985; 84:189-90. [PMID: 3982123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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38
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Herranz G. [Ethical limits of scientific research]. Rev Med Univ Navarra 1983; 27:51-5. [PMID: 6669835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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39
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Herranz G. [Medical ethics--an expendable subject?]. Rev Med Univ Navarra 1981; 25:63-5. [PMID: 7344045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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40
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Herranz P, Ceballos L, Herranz G. [Morphology of the juxtaglomerular appartus in Bartter's syndrome (hyperplasia of the juxtaglomerular complex with secondary aldosteronism without hypertension)]. Rev Med Univ Navarra 1974; 18:35-46. [PMID: 4470831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
In this paper a case of Bartter's syndrome is presented, stressing two facts: the asymmetric hyperplasia of the juxtaglomerular apparatus mostly located at the efferent arteriole. In the other hand, a new interpretation is suggested over so called "proliferative glomerulitis" seen in this syndrome. This hypothesis is based on data suggesting not a true inflammatory process but a similar lesion observed in the postnatal glomerular regression.
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41
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Herranz P, Ceballos L, Herranz G, Alonso A. [Subacute cyclohexemide poisoning. Morphological study of the liver and pancreas]. Rev Med Univ Navarra 1973; 17:295-309. [PMID: 4807212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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42
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Herranz P, Herranz G. [Hematopoiesis in the neonatal testicle]. Rev Med Univ Navarra 1973; 17:185-91. [PMID: 4808086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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43
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Alonso A, Herranz G. [Influence of chloramphenicol upon liver cancerization caused by diethylnitrosamine]. Naturwissenschaften 1970; 57:249. [PMID: 4316655 DOI: 10.1007/bf01010280] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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44
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Bueno J, Herranz G, Voltas J, Aguilar J, Otiz de Landazuri E. [Thyroid amyloid tumor with diarrhea. A new case of motor diarrhea of endocrine origin]. Rev Esp Enferm Apar Dig 1970; 30:583-94. [PMID: 5435379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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