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

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.
Keywords : Ferromagnetic order
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Journal articles
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https://hal-cea.archives-ouvertes.fr/cea-01745392
Contributor : Jérôme Planès <>
Submitted on : Wednesday, March 28, 2018 - 10:56:52 AM
Last modification on : Tuesday, September 1, 2020 - 3:24:04 PM

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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, American Physical Society, 2015, 114, pp.216401. ⟨10.1103/PhysRevLett.114.216401⟩. ⟨cea-01745392⟩

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