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A peak in the critical current for quantum critical superconductors.


ABSTRACT: Generally, studies of the critical current Ic are necessary if superconductors are to be of practical use, because Ic sets the current limit below which there is a zero-resistance state. Here, we report a peak in the pressure dependence of the zero-field Ic, Ic(0), at a hidden quantum critical point (QCP), where a continuous antiferromagnetic transition temperature is suppressed by pressure toward 0 K in CeRhIn5 and 4.4% Sn-doped CeRhIn5. The Ic(0)s of these Ce-based compounds under pressure exhibit a universal temperature dependence, underlining that the peak in zero-field Ic(P) is determined predominantly by critical fluctuations associated with the hidden QCP. The dc conductivity σdc is a minimum at the QCP, showing anti-correlation with Ic(0). These discoveries demonstrate that a quantum critical point hidden inside the superconducting phase in strongly correlated materials can be exposed by the zero-field Ic, therefore providing a direct link between a QCP and unconventional superconductivity.

SUBMITTER: Jung SG 

PROVIDER: S-EPMC5789853 | biostudies-other | 2018 Jan

REPOSITORIES: biostudies-other

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A peak in the critical current for quantum critical superconductors.

Jung Soon-Gil SG   Seo Soonbeom S   Lee Sangyun S   Bauer Eric D ED   Lee Han-Oh HO   Park Tuson T  

Nature communications 20180130 1


Generally, studies of the critical current I<sub>c</sub> are necessary if superconductors are to be of practical use, because I<sub>c</sub> sets the current limit below which there is a zero-resistance state. Here, we report a peak in the pressure dependence of the zero-field I<sub>c</sub>, I<sub>c</sub>(0), at a hidden quantum critical point (QCP), where a continuous antiferromagnetic transition temperature is suppressed by pressure toward 0 K in CeRhIn<sub>5</sub> and 4.4% Sn-doped CeRhIn<sub>  ...[more]

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