Reentrant Superconductivity Driven by Quantum Tricritical Fluctuations in URhGe: Evidence from $^{59}$Co NMR in URh$_{0.9}$Co$_{0.1}$Ge - Archive ouverte HAL Access content directly
Journal Articles Physical Review Letters Year : 2015

Reentrant Superconductivity Driven by Quantum Tricritical Fluctuations in URhGe: Evidence from $^{59}$Co NMR in URh$_{0.9}$Co$_{0.1}$Ge

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Abstract

Our measurements of the $^{59}$Co NMR spin-spin relaxation in URh$_{0.9}$Co$_{0.1}$Ge reveal a divergence of electronic spin fluctuations in the vicinity of the field-induced quantum critical point at $H_R$ $\approx$ 13 T, around which reentrant superconductivity (RSC) occurs in the ferromagnetic heavy fermion compound URhGe. We map out the strength of spin fluctuations in the ($H_b$; $H_c$) plane of magnetic field components and show that critical fluctuations develop in the same limited region near the field $H_R$ as that where RSC is observed. This strongly suggests these quantum fluctuations as the pairing glue responsible for the RSC. The fluctuations observed are characteristic of a tricritical point, followed by a phase bifurcation toward quantum critical end points.
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Dates and versions

cea-01745392 , version 1 (28-03-2018)

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Cite

Y. Tokunaga, Dai Aoki, H. Mayaffre, S. Kraemer, M. H. Julien, et al.. Reentrant Superconductivity Driven by Quantum Tricritical Fluctuations in URhGe: Evidence from $^{59}$Co NMR in URh$_{0.9}$Co$_{0.1}$Ge. Physical Review Letters, 2015, 114 (21), pp.216401. ⟨10.1103/PhysRevLett.114.216401⟩. ⟨cea-01745392⟩
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