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Title: Crossover of Charge Fluctuations across the Strange Metal Phase Diagram

Abstract

A normal metal exhibits a valence plasmon, which is a sound wave in its conduction electron density. The mysterious strange metal is characterized by non-Boltzmann transport and violates most fundamental Fermi-liquid scaling laws. A fundamental question is, do strange metals have plasmons? Using momentum-resolved inelastic electron scattering, we recently showed that, rather than a plasmon, optimally doped Bi2.1Sr1.9Ca1.0Cu2.0O8+x (Bi-2212) exhibits a featureless, temperature-independent continuum with a power-law form over most energy and momentum scales. Here, we show that this continuum is present throughout the fan-shaped, strange metal region of the phase diagram. Outside this region, dramatic changes in spectral weight are observed: In underdoped samples, spectral weight up to 0.5 eV is enhanced at low temperature, biasing the system toward a charge order instability. The situation is reversed in the overdoped case, where spectral weight is strongly suppressed at low temperature, increasing quasiparticle coherence in this regime. Optimal doping corresponds to the boundary between these two opposite behaviors at which the response is temperature independent. Our study suggests that plasmons do not exist as well-defined excitations in Bi-2212 and that a featureless continuum is a defining property of the strange metal, which is connected to a peculiar crossover where themore » spectral weight change undergoes a sign reversal.« less

Authors:
ORCiD logo; ORCiD logo; ORCiD logo; ; ; ; ; ; ORCiD logo; ;
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:
1580459
Alternate Identifier(s):
OSTI ID: 1593251
Report Number(s):
BNL-213570-2020-JAAM
Journal ID: ISSN 2160-3308; PRXHAE; 041062
Grant/Contract Number:  
FG02-06ER46285; SC0012704; DMR-1352604
Resource Type:
Published Article
Journal Name:
Physical Review. X
Additional Journal Information:
Journal Name: Physical Review. X Journal Volume: 9 Journal Issue: 4; Journal ID: ISSN 2160-3308
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Husain, Ali A., Mitrano, Matteo, Rak, Melinda S., Rubeck, Samantha, Uchoa, Bruno, March, Katia, Dwyer, Christian, Schneeloch, John, Zhong, Ruidan, Gu, G. D., and Abbamonte, Peter. Crossover of Charge Fluctuations across the Strange Metal Phase Diagram. United States: N. p., 2019. Web. doi:10.1103/PhysRevX.9.041062.
Husain, Ali A., Mitrano, Matteo, Rak, Melinda S., Rubeck, Samantha, Uchoa, Bruno, March, Katia, Dwyer, Christian, Schneeloch, John, Zhong, Ruidan, Gu, G. D., & Abbamonte, Peter. Crossover of Charge Fluctuations across the Strange Metal Phase Diagram. United States. doi:https://doi.org/10.1103/PhysRevX.9.041062
Husain, Ali A., Mitrano, Matteo, Rak, Melinda S., Rubeck, Samantha, Uchoa, Bruno, March, Katia, Dwyer, Christian, Schneeloch, John, Zhong, Ruidan, Gu, G. D., and Abbamonte, Peter. Thu . "Crossover of Charge Fluctuations across the Strange Metal Phase Diagram". United States. doi:https://doi.org/10.1103/PhysRevX.9.041062.
@article{osti_1580459,
title = {Crossover of Charge Fluctuations across the Strange Metal Phase Diagram},
author = {Husain, Ali A. and Mitrano, Matteo and Rak, Melinda S. and Rubeck, Samantha and Uchoa, Bruno and March, Katia and Dwyer, Christian and Schneeloch, John and Zhong, Ruidan and Gu, G. D. and Abbamonte, Peter},
abstractNote = {A normal metal exhibits a valence plasmon, which is a sound wave in its conduction electron density. The mysterious strange metal is characterized by non-Boltzmann transport and violates most fundamental Fermi-liquid scaling laws. A fundamental question is, do strange metals have plasmons? Using momentum-resolved inelastic electron scattering, we recently showed that, rather than a plasmon, optimally doped Bi2.1Sr1.9Ca1.0Cu2.0O8+x (Bi-2212) exhibits a featureless, temperature-independent continuum with a power-law form over most energy and momentum scales. Here, we show that this continuum is present throughout the fan-shaped, strange metal region of the phase diagram. Outside this region, dramatic changes in spectral weight are observed: In underdoped samples, spectral weight up to 0.5 eV is enhanced at low temperature, biasing the system toward a charge order instability. The situation is reversed in the overdoped case, where spectral weight is strongly suppressed at low temperature, increasing quasiparticle coherence in this regime. Optimal doping corresponds to the boundary between these two opposite behaviors at which the response is temperature independent. Our study suggests that plasmons do not exist as well-defined excitations in Bi-2212 and that a featureless continuum is a defining property of the strange metal, which is connected to a peculiar crossover where the spectral weight change undergoes a sign reversal.},
doi = {10.1103/PhysRevX.9.041062},
journal = {Physical Review. X},
number = 4,
volume = 9,
place = {United States},
year = {2019},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: https://doi.org/10.1103/PhysRevX.9.041062

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Cited by: 5 works
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