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Title: Scale-invariant magnetoresistance in a cuprate superconductor

Abstract

The anomalous metallic state in high-temperature superconducting cuprates is masked by the onset of superconductivity near a quantum critical point. Use of high magnetic elds to suppress superconductivity has enabled a detailed study of the ground state in these systems. Yet, the direct effect of strong magnetic fields on the metallic behavior at low temperatures is poorly understood, especially near critical doping, x = 0.19. Here we report a high-field magnetoresistance study of thin lms of La2-xSrxCuO4 cuprates in close vicinity to critical doping, 0.161 ≤ x ≤ 0.190. We find that the metallic state exposed by suppressing superconductivity is characterized by a magnetoresistance that is linear in magnetic field up to the highest measured elds of 80T. The slope of the linear-in- eld resistivity is temperature-independent at very high fields. It mirrors the magnitude and doping evolution of the linear-in-temperature resistivity that has been ascribed to Planckian dissipation near a quantum critical point. This establishes true scale-invariant conductivity as the signature of the strange metal state in high-temperature superconducting cuprates.

Authors:
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Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1464326
Alternate Identifier(s):
OSTI ID: 1431455
Report Number(s):
BNL-203463-2018-JAAM
Journal ID: ISSN 0036-8075; /sci/361/6401/479.atom
Grant/Contract Number:  
BES Science at 100T; SC0012704
Resource Type:
Published Article
Journal Name:
Science
Additional Journal Information:
Journal Name: Science Journal Volume: 361 Journal Issue: 6401; Journal ID: ISSN 0036-8075
Publisher:
American Association for the Advancement of Science (AAAS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Giraldo-Gallo, P., Galvis, J. A., Stegen, Z., Modic, K. A., Balakirev, F. F., Betts, J. B., Lian, X., Moir, C., Riggs, S. C., Wu, J., Bollinger, A. T., He, X., Božović, I., Ramshaw, B. J., McDonald, R. D., Boebinger, G. S., and Shekhter, A. Scale-invariant magnetoresistance in a cuprate superconductor. United States: N. p., 2018. Web. doi:10.1126/science.aan3178.
Giraldo-Gallo, P., Galvis, J. A., Stegen, Z., Modic, K. A., Balakirev, F. F., Betts, J. B., Lian, X., Moir, C., Riggs, S. C., Wu, J., Bollinger, A. T., He, X., Božović, I., Ramshaw, B. J., McDonald, R. D., Boebinger, G. S., & Shekhter, A. Scale-invariant magnetoresistance in a cuprate superconductor. United States. doi:https://doi.org/10.1126/science.aan3178
Giraldo-Gallo, P., Galvis, J. A., Stegen, Z., Modic, K. A., Balakirev, F. F., Betts, J. B., Lian, X., Moir, C., Riggs, S. C., Wu, J., Bollinger, A. T., He, X., Božović, I., Ramshaw, B. J., McDonald, R. D., Boebinger, G. S., and Shekhter, A. Thu . "Scale-invariant magnetoresistance in a cuprate superconductor". United States. doi:https://doi.org/10.1126/science.aan3178.
@article{osti_1464326,
title = {Scale-invariant magnetoresistance in a cuprate superconductor},
author = {Giraldo-Gallo, P. and Galvis, J. A. and Stegen, Z. and Modic, K. A. and Balakirev, F. F. and Betts, J. B. and Lian, X. and Moir, C. and Riggs, S. C. and Wu, J. and Bollinger, A. T. and He, X. and Božović, I. and Ramshaw, B. J. and McDonald, R. D. and Boebinger, G. S. and Shekhter, A.},
abstractNote = {The anomalous metallic state in high-temperature superconducting cuprates is masked by the onset of superconductivity near a quantum critical point. Use of high magnetic elds to suppress superconductivity has enabled a detailed study of the ground state in these systems. Yet, the direct effect of strong magnetic fields on the metallic behavior at low temperatures is poorly understood, especially near critical doping, x = 0.19. Here we report a high-field magnetoresistance study of thin lms of La2-xSrxCuO4 cuprates in close vicinity to critical doping, 0.161 ≤ x ≤ 0.190. We find that the metallic state exposed by suppressing superconductivity is characterized by a magnetoresistance that is linear in magnetic field up to the highest measured elds of 80T. The slope of the linear-in- eld resistivity is temperature-independent at very high fields. It mirrors the magnitude and doping evolution of the linear-in-temperature resistivity that has been ascribed to Planckian dissipation near a quantum critical point. This establishes true scale-invariant conductivity as the signature of the strange metal state in high-temperature superconducting cuprates.},
doi = {10.1126/science.aan3178},
journal = {Science},
number = 6401,
volume = 361,
place = {United States},
year = {2018},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
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DOI: https://doi.org/10.1126/science.aan3178

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