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Wu J, Lauter V, Ambaye H, He X, Božović I. Search for ferromagnetic order in overdoped copper-oxide superconductors. Sci Rep 2017; 7:45896. [PMID: 28378795 PMCID: PMC5381091 DOI: 10.1038/srep45896] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Accepted: 03/03/2017] [Indexed: 11/16/2022] Open
Abstract
In copper-oxides that show high-temperature superconductivity (HTS), the critical temperature (Tc) has a dome-shaped doping dependence. The cause of demise of both Tc and superfluid density ns on the overdoped side is a major puzzle. A recent study of transport and diamagnetism in a large number of overdoped La2−xSrxCuO4 (LSCO) films shows that this cannot be accounted for by disorder within the conventional Bardeen-Cooper-Schrieffer theory. This brings to focus an alternative explanation — competition of HTS with ferromagnetic order, fluctuating in superconducting samples and static beyond the superconductor-to-metal transition. Here, we examine this proposal by growing single-crystal LSCO thin films with doping on both sides of the transition by molecular beam epitaxy, and using polarized neutron reflectometry to measure their magnetic moments. In a heavily overdoped, metallic but non-superconducting LSCO (x = 0.35) film, the spin asymmetry of reflectivity shows a very small static magnetic moment (~2 emu/cm3). Less-doped, superconducting LSCO films show no magnetic moment in neutron reflectivity, both above and below Tc. Therefore, the collapse of HTS with overdoping is not caused by competing ferromagnetic order.
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Affiliation(s)
- J Wu
- Brookhaven National Laboratory, Upton, NY 11973, USA
| | - V Lauter
- Quantum Condensed Matter Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - H Ambaye
- Instrument and Source Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - X He
- Applied Physics Department, Yale University, New Haven, CT 06520, USA
| | - I Božović
- Brookhaven National Laboratory, Upton, NY 11973, USA.,Applied Physics Department, Yale University, New Haven, CT 06520, USA
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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). PHYSICAL REVIEW LETTERS 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] [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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Mohottala HE, Wells BO, Budnick JI, Hines WA, Niedermayer C, Udby L, Bernhard C, Moodenbaugh AR, Chou FC. Phase separation in superoxygenated La2-xSrxCuO4+y. NATURE MATERIALS 2006; 5:377-82. [PMID: 16617346 DOI: 10.1038/nmat1633] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2005] [Accepted: 03/08/2006] [Indexed: 05/08/2023]
Abstract
The complex interplay between superconducting and magnetic phases remains poorly understood. Here, we report on the phase separation of doped holes into separate magnetic and superconducting regions in superoxygenated La(2-x)Sr(x)CuO(4+y), with various Sr contents. Irrespective of Sr-doping, excess oxygen raises the superconducting onset to 40 K with a coexisting magnetic spin-density wave that also orders near 40 K in each of our samples. The magnetic region is closely related to the anomalous, 1/8-hole-doped magnetic versions of La(2)CuO(4), whereas the superconducting region is optimally doped. The two phases are probably the only truly stable ground states in this region of the phase diagram. This simple two-component system is a candidate for electronic phase separation in cuprate superconductors, and a key to understanding seemingly conflicting experimental observations.
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Affiliation(s)
- Hashini E Mohottala
- University of Connecticut U-3046, 2152 Hillside Road, Storrs, Connecticut 06269-3046, USA
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Wells BO, Lee YS, Kastner MA, Christianson RJ, Birgeneau RJ, Yamada K, Endoh Y, Shirane G. Incommensurate Spin Fluctuations in High-Transition Temperature Superconductors. Science 1997. [DOI: 10.1126/science.277.5329.1067] [Citation(s) in RCA: 165] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- B. O. Wells
- B. O. Wells, Y. S. Lee, M. A. Kastner, R. J. Christianson, R. J. Birgeneau, Department of Physics, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA
- K. Yamada and Y. Endoh, Department of Physics, Tohoku University, Aramaki Aoba, Sendai, 980-77, Japan
- G. Shirane, Department of Physics, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Y. S. Lee
- B. O. Wells, Y. S. Lee, M. A. Kastner, R. J. Christianson, R. J. Birgeneau, Department of Physics, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA
- K. Yamada and Y. Endoh, Department of Physics, Tohoku University, Aramaki Aoba, Sendai, 980-77, Japan
- G. Shirane, Department of Physics, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - M. A. Kastner
- B. O. Wells, Y. S. Lee, M. A. Kastner, R. J. Christianson, R. J. Birgeneau, Department of Physics, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA
- K. Yamada and Y. Endoh, Department of Physics, Tohoku University, Aramaki Aoba, Sendai, 980-77, Japan
- G. Shirane, Department of Physics, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - R. J. Christianson
- B. O. Wells, Y. S. Lee, M. A. Kastner, R. J. Christianson, R. J. Birgeneau, Department of Physics, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA
- K. Yamada and Y. Endoh, Department of Physics, Tohoku University, Aramaki Aoba, Sendai, 980-77, Japan
- G. Shirane, Department of Physics, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - R. J. Birgeneau
- B. O. Wells, Y. S. Lee, M. A. Kastner, R. J. Christianson, R. J. Birgeneau, Department of Physics, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA
- K. Yamada and Y. Endoh, Department of Physics, Tohoku University, Aramaki Aoba, Sendai, 980-77, Japan
- G. Shirane, Department of Physics, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - K. Yamada
- B. O. Wells, Y. S. Lee, M. A. Kastner, R. J. Christianson, R. J. Birgeneau, Department of Physics, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA
- K. Yamada and Y. Endoh, Department of Physics, Tohoku University, Aramaki Aoba, Sendai, 980-77, Japan
- G. Shirane, Department of Physics, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Y. Endoh
- B. O. Wells, Y. S. Lee, M. A. Kastner, R. J. Christianson, R. J. Birgeneau, Department of Physics, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA
- K. Yamada and Y. Endoh, Department of Physics, Tohoku University, Aramaki Aoba, Sendai, 980-77, Japan
- G. Shirane, Department of Physics, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - G. Shirane
- B. O. Wells, Y. S. Lee, M. A. Kastner, R. J. Christianson, R. J. Birgeneau, Department of Physics, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA
- K. Yamada and Y. Endoh, Department of Physics, Tohoku University, Aramaki Aoba, Sendai, 980-77, Japan
- G. Shirane, Department of Physics, Brookhaven National Laboratory, Upton, NY 11973, USA
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