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Zhang Z, Sutarto R, He F, Chou FC, Udby L, Holm SL, Zhu ZH, Hines WA, Budnick JI, Wells BO. Nematicity and Charge Order in Superoxygenated La_{2-x}Sr_{x}CuO_{4+y}. Phys Rev Lett 2018; 121:067602. [PMID: 30141664 DOI: 10.1103/physrevlett.121.067602] [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: 10/02/2017] [Revised: 02/24/2018] [Indexed: 06/08/2023]
Abstract
In this Letter, we report a resonant x-ray scattering measurement of stripelike charge order in the 1/8th doped component of electronically phase-separated, orthorhombic La_{2}CuO_{4+y}. This observation is coupled to the absence of any resonant (001) peak, which at different resonant energies has been identified with the presence of low-temperature-tetragonal-like structural tilt patterns or nematicity in the CuO planes. Thus, we provide evidence that structural pinning is not necessary for the formation of static charge stripes and that the relationship between charge nematicity and stripes may not be simple.
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Affiliation(s)
- Zhiwei Zhang
- Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA
| | - R Sutarto
- Canadian Light Source, Saskatoon, Saskatchewan S7N 2V3, Canada
| | - F He
- Canadian Light Source, Saskatoon, Saskatchewan S7N 2V3, Canada
| | - F C Chou
- Center for Condensed Matter Sciences, National Taiwan University, Taipei 10670, Taiwan
| | - L Udby
- X-ray and Neutron Science, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark
| | - S L Holm
- X-ray and Neutron Science, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark
| | - Z H Zhu
- Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - W A Hines
- Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA
| | - J I Budnick
- Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA
| | - B O Wells
- Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA
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Jacobsen H, Holm SL, Lăcătuşu ME, Rømer AT, Bertelsen M, Boehm M, Toft-Petersen R, Grivel JC, Emery SB, Udby L, Wells BO, Lefmann K. Distinct Nature of Static and Dynamic Magnetic Stripes in Cuprate Superconductors. Phys Rev Lett 2018; 120:037003. [PMID: 29400495 DOI: 10.1103/physrevlett.120.037003] [Citation(s) in RCA: 3] [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: 04/27/2017] [Indexed: 06/07/2023]
Abstract
We present detailed neutron scattering studies of the static and dynamic stripes in an optimally doped high-temperature superconductor, La_{2}CuO_{4+y}. We observe that the dynamic stripes do not disperse towards the static stripes in the limit of vanishing energy transfer. Therefore, the dynamic stripes observed in neutron scattering experiments are not the Goldstone modes associated with the broken symmetry of the simultaneously observed static stripes, and the signals originate from different domains in the sample. These observations support real-space electronic phase separation in the crystal, where the static stripes in one phase are pinned versions of the dynamic stripes in the other, having slightly different periods. Our results explain earlier observations of unusual dispersions in underdoped La_{2-x}Sr_{x}CuO_{4} (x=0.07) and La_{2-x}Ba_{x}CuO_{4} (x=0.095).
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Affiliation(s)
- H Jacobsen
- Nanoscience Center, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen Ø, Denmark
- Department of Physics, Oxford University, Oxford OX1 3PU, United Kingdom
| | - S L Holm
- Nanoscience Center, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen Ø, Denmark
- Interdisciplinary Nanoscience Center-INANO-Kemi, 8000 Aarhus C, Denmark
| | - M-E Lăcătuşu
- Nanoscience Center, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen Ø, Denmark
- Institute of Energy Conversion, Technical University of Denmark, 4000 Roskilde, Denmark
| | - A T Rømer
- Nanoscience Center, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen Ø, Denmark
| | - M Bertelsen
- Nanoscience Center, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen Ø, Denmark
| | - M Boehm
- Institut Max Von Laue Paul Langevin, 38042 Grenoble, France
| | - R Toft-Petersen
- Helmholtz-Zentrum Berlin, 14109 Berlin, Germany
- Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
| | - J-C Grivel
- Institute of Energy Conversion, Technical University of Denmark, 4000 Roskilde, Denmark
| | - S B Emery
- Department of Physics and Institute of Materials Science, University of Connecticut, Connecticut 06269, USA
| | - L Udby
- Nanoscience Center, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen Ø, Denmark
| | - B O Wells
- Department of Physics and Institute of Materials Science, University of Connecticut, Connecticut 06269, USA
| | - K Lefmann
- Nanoscience Center, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen Ø, Denmark
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Tikkanen J, Geilhufe M, Frontzek M, Hergert W, Ernst A, Paturi P, Udby L. The low-temperature magnetostructure and magnetic field response of Pr0.9Ca0.1MnO3: the roles of Pr spins and magnetic phase separation. J Phys Condens Matter 2016; 28:036001. [PMID: 26732100 DOI: 10.1088/0953-8984/28/3/036001] [Citation(s) in RCA: 1] [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] [Indexed: 06/05/2023]
Abstract
With the goal of elucidating the background of photoinduced ferromagnetism phenomena observed in the perovskite structured (Pr,Ca) manganites, the low-temperature magnetostructure of the material Pr0.9Ca0.1MnO3 was revised using cold neutron powder diffraction, SQUID magnetometry and ab initio calculations. Particular emphasis was placed on determining the presence of nanoscale magnetic phase separation. Previously published results of a canted A-AFM average ground state were reproduced to a good precision both experimentally and theoretically, and complemented by investigating the effects of an applied magnetic field of 2.7 T on the magnetostructure. Explicit evidence of nanoscale magnetic clusters in the material was obtained based on high-resolution neutron diffractograms. Along with several supporting arguments, we present this finding as a justification for extending the nanoscale magnetic phase separation model of manganites to the material under discussion despite its very low Ca doping level in the context of the model. In the light of the new data, we also conclude that the low temperature magnetic moment of Pr must be ca. 300% larger than previously thought in this material, close to the high spin value of 2μB per formula unit.
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Affiliation(s)
- J Tikkanen
- Wihuri Physical Laboratory, Dept. of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland
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Udby L, Larsen J, Christensen NB, Boehm M, Niedermayer C, Mohottala HE, Jensen TBS, Toft-Petersen R, Chou FC, Andersen NH, Lefmann K, Wells BO. Measurement of unique magnetic and superconducting phases in oxygen-doped high-temperature superconductors La(2-x)Sr(x)CuO(4+y). Phys Rev Lett 2013; 111:227001. [PMID: 24329465 DOI: 10.1103/physrevlett.111.227001] [Citation(s) in RCA: 5] [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: 06/11/2013] [Indexed: 06/03/2023]
Abstract
We present a combined magnetic neutron scattering and muon spin rotation study of the nature of the magnetic and superconducting phases in electronically phase separated La(2-x)Sr(x)CuO(4+y), x=0.04, 0.065, 0.09. For all samples, we find long-range modulated magnetic order below T(N) is approximately equal to Tc=39 K. In sharp contrast to oxygen-stoichiometric La(2-x)Sr(x)CuO(4), we find that the magnetic propagation vector as well as the ordered magnetic moment is independent of Sr content and consistent with that of the "striped" cuprates. Our study provides direct proof that superoxygenation in La(2-x)Sr(x)CuO(4+y) allows the spin stripe ordered phase to emerge and phase separate from superconducting regions with the hallmarks of optimally doped oxygen-stoichiometric La(2-x)Sr(x)CuO(4).
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Affiliation(s)
- L Udby
- Nanoscience Center, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark
| | - J Larsen
- Department of Physics, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
| | - N B Christensen
- Department of Physics, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
| | - M Boehm
- Institut Laue-Langevin, 38042 Grenoble Cedex 9, France
| | - Ch Niedermayer
- Laboratory for Neutron Scattering, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - H E Mohottala
- University of Hartford, West Hartford, Connecticut 06117, USA
| | - T B S Jensen
- Department of Physics, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
| | - R Toft-Petersen
- Department of Physics, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark and Helmholtz Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany
| | - F C Chou
- Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
| | - N H Andersen
- Department of Physics, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
| | - K Lefmann
- Nanoscience Center, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark
| | - B O Wells
- Department of Physics, University of Connecticut, Storrs, Connecticut 06269-3046, USA
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Horne AW, Duncan WC, King AE, Burgess S, Lourenco PC, Cornes P, Ghazal P, Williams AR, Udby L, Critchley HOD. Endometrial cysteine-rich secretory protein 3 is inhibited by human chorionic gonadotrophin, and is increased in the decidua of tubal ectopic pregnancy. Mol Hum Reprod 2009; 15:287-94. [PMID: 19282327 PMCID: PMC2666224 DOI: 10.1093/molehr/gap019] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2008] [Revised: 02/25/2009] [Accepted: 02/27/2009] [Indexed: 12/20/2022] Open
Abstract
Ectopic pregnancy (EP) remains a considerable cause of morbidity and occasional mortality. Currently, there is no reliable test to differentiate ectopic from intrauterine gestation. We have previously used array technology to demonstrate that differences in gene expression in decidualized endometrium from women with ectopic and intrauterine gestations could be used to identify candidate diagnostic biomarkers for EP. The aim of this study was to further investigate the decidual gene with the highest fold increase in EP, cysteine-rich secretory protein-3 (CRISP-3). Decidualized endometrium from gestation-matched women undergoing surgical termination of pregnancy (n = 8), evacuation of uterus for miscarriage (n = 6) and surgery for EP (n = 11) was subjected to quantitative RT-PCR, morphological assessment, immunohistochemistry and western blot analysis. Sera were analysed for progesterone and human chorionic gonadotrophin (hCG) levels. Immortalized endometrial epithelial cells were cultured with physiological concentrations of hCG. CRISP-3 mRNA and protein expression were greater in endometrium from ectopic when compared with intrauterine pregnancies (P < 0.05). CRISP-3 protein was localized to epithelium and granulocytes of endometrium. CRISP-3 serum concentrations were not different in women with ectopic compared with intrauterine pregnancies. CRISP-3 expression in endometrium was not related to the degree of decidualization or to serum progesterone levels. Endometrial CRISP-3 expression was inversely proportional to serum hCG concentrations (P < 0.001). Stimulation of endometrial epithelial cells with hCG in vitro caused a reduction in CRISP-3 expression (P < 0.01). The measurement of CRISP-3 in endometrium could provide an additional tool in the diagnosis of failing early pregnancy of unknown location. The absence of a local reduction in expression of CRISP-3 in decidualized endometrium of women with EP may be due to reduced exposure to hCG due to the ectopic location of the trophoblast.
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Affiliation(s)
- A W Horne
- Division of Reproductive and Developmental Sciences, The University of Edinburgh, Edinburgh, UK.
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Lefmann K, Willendrup PK, Udby L, Lebech B, Mortensen K, Birk JO, KlenØ K, Knudsen E, Christiansen P, Saroun J, Kulda J, Filges U, Konnecke M, Tregenna-Piggott P, Peters J, Lieutenant K, Zsigmond G, Bentley P, Farhi E. Virtual experiments: the ultimate aim of neutron ray-tracing simulations. J of Neutron Res 2008. [DOI: 10.1080/10238160902819684] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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