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Title: Strongly-overdoped $$\mathrm{La}$$2-$$_{x}$$$$\mathrm{Sr}$$$$_{x}$$$$\mathrm{CuO}$$4: Evidence for Josephson-coupled grains of strongly-correlated superconductor

Abstract

The interpretation of how superconductivity disappears in cuprates at large hole doping has been controversial. To address this issue, here we present an experimental study of single-crystal and thin film samples of La2-xSrxCuO4 (LSCO) with x ≥0.25. In particular, measurements of bulk susceptibility on LSCO crystals with x = 0.25 indicate an onset of diamagnetism at Tc1=38.5 K, with a sharp transition to a phase with full bulk shielding at Tc2=18 K, independent of field direction. Strikingly, the in-plane resistivity only goes to zero at Tc2. Inelastic neutron scattering on 0.25 crystals confirms the presence of low-energy incommensurate magnetic excitations with reduced strength compared to lower doping levels. The ratio of the spin gap to Tc2 is anomalously large. Our results are consistent with a theoretical prediction for strongly overdoped cuprates by Spivak, Oreto, and Kivelson, in which superconductivity initially develops within disconnected self-organized grains characterized by a reduced hole concentration, with bulk superconductivity occurring only after superconductivity is induced by proximity effect in the surrounding medium of higher hole concentration. Beyond the superconducting-to-metal transition, local differential conductance measurements on an LSCO thin film suggest that regions with pairing correlations survive, but are too dilute to support superconducting order. Futuremore » experiments will be needed to test the degree to which these results apply to overdoped cuprates in general.« less

Authors:
 [1];  [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [2];  [1]; ORCiD logo [1];  [1];  [1]; ORCiD logo [3];  [3]; ORCiD logo [3];  [3];  [1];  [1];  [1];  [4];  [1];  [1];  [1] more »;  [1]; ORCiD logo [2]; ORCiD logo [1] « less
+ Show Author Affiliations
  1. Brookhaven National Laboratory (BNL), Upton, NY (United States)
  2. Brookhaven National Laboratory (BNL), Upton, NY (United States); Stony Brook University, NY (United States)
  3. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  4. Brookhaven National Laboratory (BNL), Upton, NY (United States); Columbia University, New York, NY (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
OSTI Identifier:
1907224
Alternate Identifier(s):
OSTI ID: 1906164
Report Number(s):
BNL-223811-2022-JAAM
Journal ID: ISSN 2469-9950; TRN: US2311800
Grant/Contract Number:  
AC05-00OR22725; SC0012704; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. B
Additional Journal Information:
Journal Volume: 106; Journal Issue: 22; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; percolation; superconductivity; high-temperature superconductors; angle-resolved photoemission spectroscopy; inelastic neutron scattering; magnetization measurements; neutron diffraction; resistivity measurements; scanning tunneling spectroscopy

Citation Formats

Li, Yangmu, Sapkota, A., Lozano, P. M., Du, Zengyi, Li, Hui, Wu, Zebin, Kundu, Asish K., Koch, R. J., Wu, Lijun, Winn, B. L., Chi, Songxue, Matsuda, M., Frontzek, M., Božin, E. S., Zhu, Yimei, Božović, I., Pasupathy, Abhay N., Drozdov, Ilya K., Fujita, Kazuhiro, Gu, G. D., Zaliznyak, I. A., Li, Qiang, and Tranquada, J. M. Strongly-overdoped $\mathrm{La}$2-$_{x}$$\mathrm{Sr}$$_{x}$$\mathrm{CuO}$4: Evidence for Josephson-coupled grains of strongly-correlated superconductor. United States: N. p., 2022. Web. doi:10.1103/physrevb.106.224515.
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Li, Yangmu, Sapkota, A., Lozano, P. M., Du, Zengyi, Li, Hui, Wu, Zebin, Kundu, Asish K., Koch, R. J., Wu, Lijun, Winn, B. L., Chi, Songxue, Matsuda, M., Frontzek, M., Božin, E. S., Zhu, Yimei, Božović, I., Pasupathy, Abhay N., Drozdov, Ilya K., Fujita, Kazuhiro, Gu, G. D., Zaliznyak, I. A., Li, Qiang, & Tranquada, J. M. Strongly-overdoped $\mathrm{La}$2-$_{x}$$\mathrm{Sr}$$_{x}$$\mathrm{CuO}$4: Evidence for Josephson-coupled grains of strongly-correlated superconductor. United States. https://doi.org/10.1103/physrevb.106.224515
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Li, Yangmu, Sapkota, A., Lozano, P. M., Du, Zengyi, Li, Hui, Wu, Zebin, Kundu, Asish K., Koch, R. J., Wu, Lijun, Winn, B. L., Chi, Songxue, Matsuda, M., Frontzek, M., Božin, E. S., Zhu, Yimei, Božović, I., Pasupathy, Abhay N., Drozdov, Ilya K., Fujita, Kazuhiro, Gu, G. D., Zaliznyak, I. A., Li, Qiang, and Tranquada, J. M. Wed . "Strongly-overdoped $\mathrm{La}$2-$_{x}$$\mathrm{Sr}$$_{x}$$\mathrm{CuO}$4: Evidence for Josephson-coupled grains of strongly-correlated superconductor". United States. https://doi.org/10.1103/physrevb.106.224515. https://www.osti.gov/servlets/purl/1907224.
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@article{osti_1907224,
title = {Strongly-overdoped $\mathrm{La}$2-$_{x}$$\mathrm{Sr}$$_{x}$$\mathrm{CuO}$4: Evidence for Josephson-coupled grains of strongly-correlated superconductor},
author = {Li, Yangmu and Sapkota, A. and Lozano, P. M. and Du, Zengyi and Li, Hui and Wu, Zebin and Kundu, Asish K. and Koch, R. J. and Wu, Lijun and Winn, B. L. and Chi, Songxue and Matsuda, M. and Frontzek, M. and Božin, E. S. and Zhu, Yimei and Božović, I. and Pasupathy, Abhay N. and Drozdov, Ilya K. and Fujita, Kazuhiro and Gu, G. D. and Zaliznyak, I. A. and Li, Qiang and Tranquada, J. M.},
abstractNote = {The interpretation of how superconductivity disappears in cuprates at large hole doping has been controversial. To address this issue, here we present an experimental study of single-crystal and thin film samples of La2-xSrxCuO4 (LSCO) with x ≥0.25. In particular, measurements of bulk susceptibility on LSCO crystals with x = 0.25 indicate an onset of diamagnetism at Tc1=38.5 K, with a sharp transition to a phase with full bulk shielding at Tc2=18 K, independent of field direction. Strikingly, the in-plane resistivity only goes to zero at Tc2. Inelastic neutron scattering on 0.25 crystals confirms the presence of low-energy incommensurate magnetic excitations with reduced strength compared to lower doping levels. The ratio of the spin gap to Tc2 is anomalously large. Our results are consistent with a theoretical prediction for strongly overdoped cuprates by Spivak, Oreto, and Kivelson, in which superconductivity initially develops within disconnected self-organized grains characterized by a reduced hole concentration, with bulk superconductivity occurring only after superconductivity is induced by proximity effect in the surrounding medium of higher hole concentration. Beyond the superconducting-to-metal transition, local differential conductance measurements on an LSCO thin film suggest that regions with pairing correlations survive, but are too dilute to support superconducting order. Future experiments will be needed to test the degree to which these results apply to overdoped cuprates in general.},
doi = {10.1103/physrevb.106.224515},
journal = {Physical Review. B},
number = 22,
volume = 106,
place = {United States},
year = {Wed Dec 21 00:00:00 EST 2022},
month = {Wed Dec 21 00:00:00 EST 2022}
}
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  • Nature Physics, Vol. 8, Issue 1
  • DOI: 10.1038/nphys2154

Whole powder pattern decomposition methods and applications: A retrospection
journal, December 2005

Effect of the pseudogap on suppressing high energy inelastic neutron scattering in superconducting YBa 2 Cu 3 O 6.5
journal, November 2010

Electronic Origin of the Inhomogeneous Pairing Interaction in the High-Tc Superconductor Bi2Sr2CaCu2O8+ 
journal, April 2008

n s − T c Correlations in Granular Superconductors
journal, August 2012

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