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Anomalous quantum criticality in the electron-doped cuprates.


ABSTRACT: In the physics of condensed matter, quantum critical phenomena and unconventional superconductivity are two major themes. In electron-doped cuprates, the low critical field (HC2) allows one to study the putative quantum critical point (QCP) at low temperature and to understand its connection to the long-standing problem of the origin of the high-TC superconductivity. Here we present measurements of the low-temperature normal-state thermopower (S) of the electron-doped cuprate superconductor La2-x Ce x CuO4 (LCCO) from x = 0.11-0.19. We observe quantum critical [Formula: see text] versus [Formula: see text] behavior over an unexpectedly wide doping range x = 0.15-0.17 above the QCP (x = 0.14), with a slope that scales monotonically with the superconducting transition temperature (TC with H = 0). The presence of quantum criticality over a wide doping range provides a window on the criticality. The thermopower behavior also suggests that the critical fluctuations are linked with TC Above the superconductivity dome, at x = 0.19, a conventional Fermi-liquid [Formula: see text] behavior is found for [Formula: see text] 40 K.

SUBMITTER: Mandal PR 

PROVIDER: S-EPMC6442589 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature

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Anomalous quantum criticality in the electron-doped cuprates.

Mandal P R PR   Sarkar Tarapada T   Greene Richard L RL  

Proceedings of the National Academy of Sciences of the United States of America 20190312 13


In the physics of condensed matter, quantum critical phenomena and unconventional superconductivity are two major themes. In electron-doped cuprates, the low critical field (H<sub>C2</sub>) allows one to study the putative quantum critical point (QCP) at low temperature and to understand its connection to the long-standing problem of the origin of the high-<i>T<sub>C</sub></i> superconductivity. Here we present measurements of the low-temperature normal-state thermopower (<i>S</i>) of the electr  ...[more]

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