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Title: Anomalous density fluctuations in a strange metal

Abstract

A central mystery in high-temperature superconductivity is the origin of the so-called strange metal (i.e., the anomalous conductor from which superconductivity emerges at low temperature). Measuring the dynamic charge response of the copper oxides, χ"(q,ω), would directly reveal the collective properties of the strange metal, but it has never been possible to measure this quantity with millielectronvolt resolution. Here, we present a measurement of χ"(q,ω) for a cuprate, optimally doped Bi 2.1Sr 1.9CaCu 2O 8+x (T c = 91 K), using momentum-resolved inelastic electron scattering. In the medium energy range 0.1–2 eV relevant to the strange metal, the spectra are dominated by a featureless, temperature- and momentum-independent continuum persisting to the electronvolt energy scale. This continuum displays a simple power-law form, exhibiting q 2 behavior at low energy and q 22 behavior at high energy. Measurements of an overdoped crystal (T c = 50 K) showed the emergence of a gap-like feature at low temperature, indicating deviation from power law form outside the strange-metal regime. In conclusion, our study suggests the strange metal exhibits a new type of charge dynamics in which excitations are local to such a degree that space and time axes are decoupled.

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4];  [4];  [4];  [1]
  1. Univ. of Illinois, Urbana-Champaign, IL (United States). Dept. of Physics; Univ. of Illinois, Urbana-Champaign, IL (United States). Materials Research Lab.
  2. Karlsruhe Inst. of Technology (KIT) (Germany). Inst. for the Theory of Condensed Matter
  3. Univ. of Oklahoma, Norman, OK (United States). Dept. of Physics and Astronomy
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1462403
Alternate Identifier(s):
OSTI ID: 1438288
Report Number(s):
BNL-207872-2018-JAAM
Journal ID: ISSN 0027-8424
Grant/Contract Number:  
SC0012704; AC02-98CH10886; GBMF4542; DMR-1352604
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 115; Journal Issue: 21; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; non-Fermi liquid; strange metal; cuprates; quantum criticality; electron energy-loss spectroscopy

Citation Formats

Mitrano, M., Husain, A. A., Vig, S., Kogar, A., Rak, M. S., Rubeck, S. I., Schmalian, J., Uchoa, B., Schneeloch, J., Zhong, R., Gu, G. D., and Abbamonte, P.. Anomalous density fluctuations in a strange metal. United States: N. p., 2018. Web. doi:10.1073/pnas.1721495115.
Mitrano, M., Husain, A. A., Vig, S., Kogar, A., Rak, M. S., Rubeck, S. I., Schmalian, J., Uchoa, B., Schneeloch, J., Zhong, R., Gu, G. D., & Abbamonte, P.. Anomalous density fluctuations in a strange metal. United States. doi:10.1073/pnas.1721495115.
Mitrano, M., Husain, A. A., Vig, S., Kogar, A., Rak, M. S., Rubeck, S. I., Schmalian, J., Uchoa, B., Schneeloch, J., Zhong, R., Gu, G. D., and Abbamonte, P.. Mon . "Anomalous density fluctuations in a strange metal". United States. doi:10.1073/pnas.1721495115.
@article{osti_1462403,
title = {Anomalous density fluctuations in a strange metal},
author = {Mitrano, M. and Husain, A. A. and Vig, S. and Kogar, A. and Rak, M. S. and Rubeck, S. I. and Schmalian, J. and Uchoa, B. and Schneeloch, J. and Zhong, R. and Gu, G. D. and Abbamonte, P.},
abstractNote = {A central mystery in high-temperature superconductivity is the origin of the so-called strange metal (i.e., the anomalous conductor from which superconductivity emerges at low temperature). Measuring the dynamic charge response of the copper oxides, χ"(q,ω), would directly reveal the collective properties of the strange metal, but it has never been possible to measure this quantity with millielectronvolt resolution. Here, we present a measurement of χ"(q,ω) for a cuprate, optimally doped Bi2.1Sr1.9CaCu2O8+x (Tc = 91 K), using momentum-resolved inelastic electron scattering. In the medium energy range 0.1–2 eV relevant to the strange metal, the spectra are dominated by a featureless, temperature- and momentum-independent continuum persisting to the electronvolt energy scale. This continuum displays a simple power-law form, exhibiting q2 behavior at low energy and q2/ω2 behavior at high energy. Measurements of an overdoped crystal (Tc = 50 K) showed the emergence of a gap-like feature at low temperature, indicating deviation from power law form outside the strange-metal regime. In conclusion, our study suggests the strange metal exhibits a new type of charge dynamics in which excitations are local to such a degree that space and time axes are decoupled.},
doi = {10.1073/pnas.1721495115},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 21,
volume = 115,
place = {United States},
year = {Mon May 07 00:00:00 EDT 2018},
month = {Mon May 07 00:00:00 EDT 2018}
}

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Free Publicly Available Full Text
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Cited by: 3 works
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