Hidden magnetism and quantum criticality in the heavy fermion superconductor CeRhIn5

Nature
Tuson ParkJ D Thompson

Abstract

With only a few exceptions that are well understood, conventional superconductivity does not coexist with long-range magnetic order (for example, ref. 1). Unconventional superconductivity, on the other hand, develops near a phase boundary separating magnetically ordered and magnetically disordered phases. A maximum in the superconducting transition temperature T(c) develops where this boundary extrapolates to zero Kelvin, suggesting that fluctuations associated with this magnetic quantum-critical point are essential for unconventional superconductivity. Invariably, though, unconventional superconductivity masks the magnetic phase boundary when T < T(c), preventing proof of a magnetic quantum-critical point. Here we report specific-heat measurements of the pressure-tuned unconventional superconductor CeRhIn5 in which we find a line of quantum-phase transitions induced inside the superconducting state by an applied magnetic field. This quantum-critical line separates a phase of coexisting antiferromagnetism and superconductivity from a purely unconventional superconducting phase, and terminates at a quantum tetracritical point where the magnetic field completely suppresses superconductivity. The T --> 0 K magnetic field-pressure ...Continue Reading

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Citations

May 9, 2008·Proceedings of the National Academy of Sciences of the United States of America·T ParkJ D Thompson
May 7, 2009·Proceedings of the National Academy of Sciences of the United States of America·Suchitra E SebastianT Ebihara
Apr 25, 2012·Proceedings of the National Academy of Sciences of the United States of America·Yejun FengT F Rosenbaum
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Feb 13, 2015·Proceedings of the National Academy of Sciences of the United States of America·Thomas WillersAndrea Severing
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Mar 30, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·D M FobesM Janoschek
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