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Pasculli A, Gurrado A, Vittore F, De Luca GM, Sammarco A, Testini M. Robotic-assisted treatment of intestinal malrotation in an adult man - a video vignette. Colorectal Dis 2020; 22:2335-2336. [PMID: 32668098 DOI: 10.1111/codi.15267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Accepted: 06/29/2020] [Indexed: 02/08/2023]
Affiliation(s)
- A Pasculli
- Department of Biomedical Science and Human Oncology, Academic Unit of General Surgery 'V. Bonomo', University of Bari 'Aldo Moro', Bari, Italy
| | - A Gurrado
- Department of Biomedical Science and Human Oncology, Academic Unit of General Surgery 'V. Bonomo', University of Bari 'Aldo Moro', Bari, Italy
| | - F Vittore
- Department of Biomedical Science and Human Oncology, Academic Unit of General Surgery 'V. Bonomo', University of Bari 'Aldo Moro', Bari, Italy
| | - G M De Luca
- Department of Biomedical Science and Human Oncology, Academic Unit of General Surgery 'V. Bonomo', University of Bari 'Aldo Moro', Bari, Italy
| | - A Sammarco
- Department of Biomedical Science and Human Oncology, Academic Unit of General Surgery 'V. Bonomo', University of Bari 'Aldo Moro', Bari, Italy
| | - M Testini
- Department of Biomedical Science and Human Oncology, Academic Unit of General Surgery 'V. Bonomo', University of Bari 'Aldo Moro', Bari, Italy
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2
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Arpaia R, Caprara S, Fumagalli R, De Vecchi G, Peng YY, Andersson E, Betto D, De Luca GM, Brookes NB, Lombardi F, Salluzzo M, Braicovich L, Di Castro C, Grilli M, Ghiringhelli G. Dynamical charge density fluctuations pervading the phase diagram of a Cu-based high- T c superconductor. Science 2020; 365:906-910. [PMID: 31467219 DOI: 10.1126/science.aav1315] [Citation(s) in RCA: 78] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Accepted: 07/30/2019] [Indexed: 11/02/2022]
Abstract
Charge density modulations have been observed in all families of high-critical temperature (T c) superconducting cuprates. Although they are consistently found in the underdoped region of the phase diagram and at relatively low temperatures, it is still unclear to what extent they influence the unusual properties of these systems. Using resonant x-ray scattering, we carefully determined the temperature dependence of charge density modulations in YBa2Cu3O7-δ and Nd1+ x Ba2- x Cu3O7-δ for several doping levels. We isolated short-range dynamical charge density fluctuations in addition to the previously known quasi-critical charge density waves. They persist up to well above the pseudogap temperature T*, are characterized by energies of a few milli-electron volts, and pervade a large area of the phase diagram.
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Affiliation(s)
- R Arpaia
- Dipartimento di Fisica, Politecnico di Milano, I-20133 Milano, Italy. .,Quantum Device Physics Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-41296 Göteborg, Sweden
| | - S Caprara
- Dipartimento di Fisica, Università di Roma "La Sapienza," I-00185 Roma, Italy.,CNR-ISC, I-00185 Roma, Italy
| | - R Fumagalli
- Dipartimento di Fisica, Politecnico di Milano, I-20133 Milano, Italy
| | - G De Vecchi
- Dipartimento di Fisica, Politecnico di Milano, I-20133 Milano, Italy
| | - Y Y Peng
- Dipartimento di Fisica, Politecnico di Milano, I-20133 Milano, Italy
| | - E Andersson
- Quantum Device Physics Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-41296 Göteborg, Sweden
| | - D Betto
- ESRF, European Synchrotron, F-38043 Grenoble, France
| | - G M De Luca
- Dipartimento di Fisica "E. Pancini," Università di Napoli Federico II, Complesso Monte Sant'Angelo, I-80126 Napoli, Italy.,CNR-SPIN, Complesso Monte Sant'Angelo, I-80126 Napoli, Italy
| | - N B Brookes
- ESRF, European Synchrotron, F-38043 Grenoble, France
| | - F Lombardi
- Quantum Device Physics Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-41296 Göteborg, Sweden
| | - M Salluzzo
- CNR-SPIN, Complesso Monte Sant'Angelo, I-80126 Napoli, Italy
| | - L Braicovich
- Dipartimento di Fisica, Politecnico di Milano, I-20133 Milano, Italy.,ESRF, European Synchrotron, F-38043 Grenoble, France
| | - C Di Castro
- Dipartimento di Fisica, Università di Roma "La Sapienza," I-00185 Roma, Italy.,CNR-ISC, I-00185 Roma, Italy
| | - M Grilli
- Dipartimento di Fisica, Università di Roma "La Sapienza," I-00185 Roma, Italy.,CNR-ISC, I-00185 Roma, Italy
| | - G Ghiringhelli
- Dipartimento di Fisica, Politecnico di Milano, I-20133 Milano, Italy. .,CNR-SPIN, Dipartimento di Fisica, Politecnico di Milano, I-20133 Milano, Italy
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3
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Peng YY, Fumagalli R, Ding Y, Minola M, Caprara S, Betto D, Bluschke M, De Luca GM, Kummer K, Lefrançois E, Salluzzo M, Suzuki H, Le Tacon M, Zhou XJ, Brookes NB, Keimer B, Braicovich L, Grilli M, Ghiringhelli G. Re-entrant charge order in overdoped (Bi,Pb) 2.12Sr 1.88CuO 6+δ outside the pseudogap regime. Nat Mater 2018; 17:697-702. [PMID: 29891891 DOI: 10.1038/s41563-018-0108-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Accepted: 05/14/2018] [Indexed: 06/08/2023]
Abstract
In the underdoped regime, the cuprate high-temperature superconductors exhibit a host of unusual collective phenomena, including unconventional spin and charge density modulations, Fermi surface reconstructions, and a pseudogap in various physical observables. Conversely, overdoped cuprates are generally regarded as conventional Fermi liquids possessing no collective electronic order. In partial contradiction to this widely held picture, we report resonant X-ray scattering measurements revealing incommensurate charge order reflections for overdoped (Bi,Pb)2.12Sr1.88CuO6+δ (Bi2201), with correlation lengths of 40-60 lattice units, that persist up to temperatures of at least 250 K. The value of the charge order wavevector decreases with doping, in line with the extrapolation of the trend previously observed in underdoped Bi2201. In overdoped materials, however, charge order coexists with a single, unreconstructed Fermi surface without nesting or pseudogap features. The discovery of re-entrant charge order in Bi2201 thus calls for investigations in other cuprate families and for a reconsideration of theories that posit an essential relationship between these phenomena.
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Affiliation(s)
- Y Y Peng
- Dipartimento di Fisica, Politecnico di Milano, Milano, Italy
- Department of Physics and Seitz Materials Research Laboratory, University of Illinois, Urbana, IL, USA
| | - R Fumagalli
- Dipartimento di Fisica, Politecnico di Milano, Milano, Italy
| | - Y Ding
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China
| | - M Minola
- Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
| | - S Caprara
- Dipartimento di Fisica, Università di Roma 'La Sapienza', Roma, Italy
- CNR-ISC, Roma, Italy
| | - D Betto
- ESRF, The European Synchrotron, Grenoble, France
| | - M Bluschke
- Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
| | - G M De Luca
- Dipartimento di Fisica 'E. Pancini', Università di Napoli Federico II, Napoli, Italy
- CNR-SPIN, Napoli, Italy
| | - K Kummer
- ESRF, The European Synchrotron, Grenoble, France
| | - E Lefrançois
- Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
| | | | - H Suzuki
- Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
| | - M Le Tacon
- Institute of Solid State Physics (IFP), Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - X J Zhou
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China
| | - N B Brookes
- ESRF, The European Synchrotron, Grenoble, France
| | - B Keimer
- Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
| | - L Braicovich
- Dipartimento di Fisica, Politecnico di Milano, Milano, Italy
- ESRF, The European Synchrotron, Grenoble, France
| | - M Grilli
- Dipartimento di Fisica, Università di Roma 'La Sapienza', Roma, Italy
- CNR-ISC, Roma, Italy
| | - G Ghiringhelli
- Dipartimento di Fisica, Politecnico di Milano, Milano, Italy.
- CNR-SPIN, Dipartimento di Fisica, Politecnico di Milano, Milano, Italy.
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4
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Testini M, Piccinni G, Lissidini G, Gurrado A, Tedeschi M, Franco IF, Di Meo G, Pasculli A, De Luca GM, Ribezzi M, Falconi M. Surgical management of the pancreatic stump following pancreato-duodenectomy. J Visc Surg 2016; 153:193-202. [PMID: 27130693 DOI: 10.1016/j.jviscsurg.2016.04.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Pancreato-duodenectomy (PD) is the treatment of choice for periampullary tumors, and currently, indications have been extended to benign disease, including symptomatic chronic pancreatitis, paraduodenal pancreatitis, and benign periampullary tumors that are not amenable to conservative surgery. In spite of a significant decrease in mortality in high volume centers over the last three decades (from>20% in the 1980s to<5% today), morbidity remains high, ranging from 30% to 50%. The most common complications are related to the pancreatic remnant, such as postoperative pancreatic fistula, anastomotic dehiscence, abscess, and hemorrhage, and are among the highest of all surgical complications following intra-abdominal gastro-intestinal anastomoses. Moreover, pancreatico-enteric anastomotic breakdown remains a life-threatening complication. For these reasons, the management of the pancreatic stump following resection is still one of the most hotly debated issues in digestive surgery; more than 80 different methods of pancreatico-enteric reconstructions having been described, and no gold standard has yet been defined. In this review, we analyzed the current trends in the surgical management of the pancreatic remnant after PD.
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Affiliation(s)
- M Testini
- Endocrine, Digestive, and Emergency Surgery Unit, Department of Biomedical Sciences and Human Oncology, University Medical School of Bari, Policlinico, Piazza Giulio Cesare 11, 70121 Bari, Italy.
| | - G Piccinni
- Endocrine, Digestive, and Emergency Surgery Unit, Department of Biomedical Sciences and Human Oncology, University Medical School of Bari, Policlinico, Piazza Giulio Cesare 11, 70121 Bari, Italy
| | - G Lissidini
- Endocrine, Digestive, and Emergency Surgery Unit, Department of Biomedical Sciences and Human Oncology, University Medical School of Bari, Policlinico, Piazza Giulio Cesare 11, 70121 Bari, Italy
| | - A Gurrado
- Endocrine, Digestive, and Emergency Surgery Unit, Department of Biomedical Sciences and Human Oncology, University Medical School of Bari, Policlinico, Piazza Giulio Cesare 11, 70121 Bari, Italy
| | - M Tedeschi
- Endocrine, Digestive, and Emergency Surgery Unit, Department of Biomedical Sciences and Human Oncology, University Medical School of Bari, Policlinico, Piazza Giulio Cesare 11, 70121 Bari, Italy
| | - I F Franco
- Endocrine, Digestive, and Emergency Surgery Unit, Department of Biomedical Sciences and Human Oncology, University Medical School of Bari, Policlinico, Piazza Giulio Cesare 11, 70121 Bari, Italy
| | - G Di Meo
- Endocrine, Digestive, and Emergency Surgery Unit, Department of Biomedical Sciences and Human Oncology, University Medical School of Bari, Policlinico, Piazza Giulio Cesare 11, 70121 Bari, Italy
| | - A Pasculli
- Endocrine, Digestive, and Emergency Surgery Unit, Department of Biomedical Sciences and Human Oncology, University Medical School of Bari, Policlinico, Piazza Giulio Cesare 11, 70121 Bari, Italy
| | - G M De Luca
- Endocrine, Digestive, and Emergency Surgery Unit, Department of Biomedical Sciences and Human Oncology, University Medical School of Bari, Policlinico, Piazza Giulio Cesare 11, 70121 Bari, Italy
| | - M Ribezzi
- Anesthesiology Unit, Department of Emergency Surgery and Organs Transplantation, University Medical School of Bari, Policlinico, Piazza Giulio Cesare 11, 70121 Bari, Italy
| | - M Falconi
- Pancreatic Surgery Unit, San Raffaele Hospital IRCCS, University Vita e Salute, Milan, Italy
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5
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Stornaiuolo D, Cantoni C, De Luca GM, Di Capua R, Di Gennaro E, Ghiringhelli G, Jouault B, Marrè D, Massarotti D, Miletto Granozio F, Pallecchi I, Piamonteze C, Rusponi S, Tafuri F, Salluzzo M. Tunable spin polarization and superconductivity in engineered oxide interfaces. Nat Mater 2016; 15:278-283. [PMID: 26641020 DOI: 10.1038/nmat4491] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2015] [Accepted: 10/16/2015] [Indexed: 06/05/2023]
Abstract
Advances in growth technology of oxide materials allow single atomic layer control of heterostructures. In particular delta doping, a key materials' engineering tool in today's semiconductor technology, is now also available for oxides. Here we show that a fully electric-field-tunable spin-polarized and superconducting quasi-2D electron system (q2DES) can be artificially created by inserting a few unit cells of delta doping EuTiO3 at the interface between LaAlO3 and SrTiO3 oxides. Spin polarization emerges below the ferromagnetic transition temperature of the EuTiO3 layer (TFM = 6-8 K) and is due to the exchange interaction between the magnetic moments of Eu-4f and of Ti-3d electrons. Moreover, in a large region of the phase diagram, superconductivity sets in from a ferromagnetic normal state. The occurrence of magnetic interactions, superconductivity and spin-orbit coupling in the same q2DES makes the LaAlO3/EuTiO3/SrTiO3 system an intriguing platform for the emergence of novel quantum phases in low-dimensional materials.
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Affiliation(s)
- D Stornaiuolo
- Dipartimento di Fisica, Università di Napoli "Federico II", Complesso Monte Sant'Angelo via Cinthia, I-80126 Napoli, Italy
- CNR-SPIN, Complesso Monte Sant'Angelo via Cinthia, I-80126 Napoli, Italy
| | - C Cantoni
- Materials Science and Technology Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee 37831, USA
| | - G M De Luca
- Dipartimento di Fisica, Università di Napoli "Federico II", Complesso Monte Sant'Angelo via Cinthia, I-80126 Napoli, Italy
- CNR-SPIN, Complesso Monte Sant'Angelo via Cinthia, I-80126 Napoli, Italy
| | - R Di Capua
- Dipartimento di Fisica, Università di Napoli "Federico II", Complesso Monte Sant'Angelo via Cinthia, I-80126 Napoli, Italy
- CNR-SPIN, Complesso Monte Sant'Angelo via Cinthia, I-80126 Napoli, Italy
| | - E Di Gennaro
- Dipartimento di Fisica, Università di Napoli "Federico II", Complesso Monte Sant'Angelo via Cinthia, I-80126 Napoli, Italy
- CNR-SPIN, Complesso Monte Sant'Angelo via Cinthia, I-80126 Napoli, Italy
| | - G Ghiringhelli
- CNR-SPIN and Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
| | - B Jouault
- Laboratoire Charles Coulomb, UMR 5221, CNRS, Université Montpellier 2, F-34095 Montpellier, France
| | - D Marrè
- CNR-SPIN and Dipartimento di Fisica, Università di Genova, Via Dodecaneso 33, I-14146 Genova, Italy
| | - D Massarotti
- Dipartimento di Fisica, Università di Napoli "Federico II", Complesso Monte Sant'Angelo via Cinthia, I-80126 Napoli, Italy
- CNR-SPIN, Complesso Monte Sant'Angelo via Cinthia, I-80126 Napoli, Italy
| | - F Miletto Granozio
- CNR-SPIN, Complesso Monte Sant'Angelo via Cinthia, I-80126 Napoli, Italy
| | - I Pallecchi
- CNR-SPIN and Dipartimento di Fisica, Università di Genova, Via Dodecaneso 33, I-14146 Genova, Italy
| | - C Piamonteze
- Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - S Rusponi
- Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - F Tafuri
- CNR-SPIN, Complesso Monte Sant'Angelo via Cinthia, I-80126 Napoli, Italy
- Dipartimento di Ingegneria dell'Informazione, Seconda Università degli Studi di Napoli (SUN), 81031 Aversa (CE), Italy
| | - M Salluzzo
- CNR-SPIN, Complesso Monte Sant'Angelo via Cinthia, I-80126 Napoli, Italy
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6
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Salluzzo M, Gariglio S, Stornaiuolo D, Sessi V, Rusponi S, Piamonteze C, De Luca GM, Minola M, Marré D, Gadaleta A, Brune H, Nolting F, Brookes NB, Ghiringhelli G. Origin of interface magnetism in BiMnO3/SrTiO3 and LaAlO3/SrTiO3 heterostructures. Phys Rev Lett 2013; 111:087204. [PMID: 24010471 DOI: 10.1103/physrevlett.111.087204] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2013] [Indexed: 06/02/2023]
Abstract
Possible ferromagnetism induced in otherwise nonmagnetic materials has been motivating intense research in complex oxide heterostructures. Here we show that a confined magnetism is realized at the interface between SrTiO3 and two insulating polar oxides, BiMnO3 and LaAlO3. By using polarization dependent x-ray absorption spectroscopy, we find that in both cases the magnetism can be stabilized by a negative exchange interaction between the electrons transferred to the interface and local magnetic moments. These local magnetic moments are associated with magnetic Ti3+ ions at the interface itself for LaAlO3/SrTiO3 and to Mn3+ ions in the overlayer for BiMnO3/SrTiO3. In LaAlO3/SrTiO3 the induced magnetism is quenched by annealing in oxygen, suggesting a decisive role of oxygen vacancies in this phenomenon.
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Affiliation(s)
- M Salluzzo
- CNR-SPIN, Complesso MonteSantangelo via Cinthia, I-80126 Napoli, Italy
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7
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Ghiringhelli G, Le Tacon M, Minola M, Blanco-Canosa S, Mazzoli C, Brookes NB, De Luca GM, Frano A, Hawthorn DG, He F, Loew T, Moretti Sala M, Peets DC, Salluzzo M, Schierle E, Sutarto R, Sawatzky GA, Weschke E, Keimer B, Braicovich L. Long-Range Incommensurate Charge Fluctuations in (Y,Nd)Ba2Cu3O6+x. Science 2012; 337:821-5. [PMID: 22798406 DOI: 10.1126/science.1223532] [Citation(s) in RCA: 256] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- G Ghiringhelli
- CNR-SPIN, Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, and Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy.
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8
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Braicovich L, van den Brink J, Bisogni V, Sala MM, Ament LJP, Brookes NB, De Luca GM, Salluzzo M, Schmitt T, Strocov VN, Ghiringhelli G. Magnetic excitations and phase separation in the underdoped La2-xSrxCuO4 superconductor measured by resonant inelastic X-ray scattering. Phys Rev Lett 2010; 104:077002. [PMID: 20366909 DOI: 10.1103/physrevlett.104.077002] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2009] [Indexed: 05/23/2023]
Abstract
We probe the collective magnetic modes of La2CuO4 and underdoped La2-xSrxCuO4 (LSCO) by momentum resolved resonant inelastic x-ray scattering (RIXS) at the Cu L3 edge. For the undoped antiferromagnetic sample, we show that the single magnon dispersion measured with RIXS coincides with the one determined by inelastic neutron scattering, thus demonstrating that x rays are an alternative to neutrons in this field. In the spin dynamics of LSCO, we find a branch dispersing up to approximately 400 meV coexisting with one at lower energy. The high-energy branch has never been seen before. It indicates that underdoped LSCO is in a dynamic inhomogeneous spin state.
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Affiliation(s)
- L Braicovich
- CNR-INFM Coherentia and Soft, Dipartimento di Fisica, Politecnico di Milano, I-20133 Milano, Italy
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9
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Braicovich L, Ament LJP, Bisogni V, Forte F, Aruta C, Balestrino G, Brookes NB, De Luca GM, Medaglia PG, Granozio FM, Radovic M, Salluzzo M, van den Brink J, Ghiringhelli G. Dispersion of magnetic excitations in the cuprate La2CuO4 and CaCuO2 compounds measured using resonant x-ray scattering. Phys Rev Lett 2009; 102:167401. [PMID: 19518752 DOI: 10.1103/physrevlett.102.167401] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2008] [Indexed: 05/27/2023]
Abstract
By resonant inelastic x-ray scattering in the soft x-ray regime we probe the dynamical multiple-spin correlations in the antiferromagnetic cuprates La2CuO4 and CaCuO2. High resolution measurements at the copper L3 edge allow the clear observation of dispersing bimagnon excitations. Theory based on the ultrashort core-hole lifetime expansion fits the data on these coherent spin excitations without free parameters.
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Affiliation(s)
- L Braicovich
- CNR-INFM Coherentia and Soft, Dipartimento di Fisica, Politecnico di Milano, I-20133 Milano, Italy
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10
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Salluzzo M, Cezar JC, Brookes NB, Bisogni V, De Luca GM, Richter C, Thiel S, Mannhart J, Huijben M, Brinkman A, Rijnders G, Ghiringhelli G. Orbital reconstruction and the two-dimensional electron gas at the LaAlO3/SrTiO3 interface. Phys Rev Lett 2009; 102:166804. [PMID: 19518739 DOI: 10.1103/physrevlett.102.166804] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2008] [Indexed: 05/27/2023]
Abstract
In 2004, Ohtomo and Hwang discovered that an electron gas is created at the interface between insulating LaAlO3 and SrTiO3 compounds. Here we show that the generation of a conducting electron gas is related to an orbital reconstruction occurring at the LaAlO3/SrTiO3 interface. Our results are based on extensive investigations of the electronic properties and of the orbital structure of the interface using x-ray absorption spectroscopy. In particular, we find that the degeneracy of the Ti 3d states is fully removed and that the Ti 3d xy levels become the first available states for conducting electrons.
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Affiliation(s)
- M Salluzzo
- CNR-INFM COHERENTIA, Complesso MonteSantangelo via Cinthia, 80126 Napoli, Italy.
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11
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Salluzzo M, Ghiringhelli G, Cezar JC, Brookes NB, De Luca GM, Fracassi F, Vaglio R. Indirect electric field doping of the CuO2 planes of the cuprate NdBa2Cu3O7 superconductor. Phys Rev Lett 2008; 100:056810. [PMID: 18352415 DOI: 10.1103/physrevlett.100.056810] [Citation(s) in RCA: 5] [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] [Received: 09/05/2007] [Indexed: 05/26/2023]
Abstract
The mechanism of field-effect doping in the 123 high critical temperature superconductors (HTS) has been investigated by x-ray absorption spectroscopy in the presence of an electric field. We demonstrate that holes are created at the CuO chains of the charge reservoir and that field-effect doping of the CuO(2) planes occurs by charge transfer, from the chains to the planes, of a fraction of the overall induced holes. The electronic properties of the charge reservoir and of the dielectric-HTS interface determine the electric field doping of the CuO(2) planes.
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Affiliation(s)
- M Salluzzo
- CNR-INFM COHERENTIA, Dipartimento di Scienze Fisiche Università di Napoli Federico II, Complesso di Monte S. Angelo, Via Cinthia, 80126 Napoli, Italy.
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