TY - JOUR
T1 - Quantum tricritical fluctuations driving mass enhancement and reentrant superconductivity in URhGe
AU - Tokunaga, Y.
AU - Aoki, D.
AU - Mayaffre, H.
AU - Krämer, S.
AU - Julien, M. H.
AU - Berthier, C.
AU - Horvatić, M.
AU - Sakai, H.
AU - Kambe, S.
AU - Hattori, T.
AU - Araki, S.
N1 - Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2016/2/5
Y1 - 2016/2/5
N2 - The field-induced reentrant superconductivity (RSC) discovered near a quantum critical point (QCP) in a ferromagnetic superconductor URhGe highlights the close interplay between superconductivity and magnetism. While the origin of the RSC is broadly thought to be associated with quantum critical fluctuations, their exact nature had not been well identified. Here we review our recent 59Co NMR study in a single crystal of URh0.9Co0.1Ge. Our measurements of the NMR spin-spin relaxation reveal a divergence of electronic spin fluctuations in the vicinity of the field-induced QCP at HR ≈ 13 T. The fluctuations observed are characteristic of a tricritical point, followed by a phase bifurcation toward quantum wing-critical points. We show that these tricritical fluctuations enhance the effective mass of the conduction electrons and, further, drive the RSC near the HR.
AB - The field-induced reentrant superconductivity (RSC) discovered near a quantum critical point (QCP) in a ferromagnetic superconductor URhGe highlights the close interplay between superconductivity and magnetism. While the origin of the RSC is broadly thought to be associated with quantum critical fluctuations, their exact nature had not been well identified. Here we review our recent 59Co NMR study in a single crystal of URh0.9Co0.1Ge. Our measurements of the NMR spin-spin relaxation reveal a divergence of electronic spin fluctuations in the vicinity of the field-induced QCP at HR ≈ 13 T. The fluctuations observed are characteristic of a tricritical point, followed by a phase bifurcation toward quantum wing-critical points. We show that these tricritical fluctuations enhance the effective mass of the conduction electrons and, further, drive the RSC near the HR.
UR - http://www.scopus.com/inward/record.url?scp=84962840873&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84962840873&partnerID=8YFLogxK
U2 - 10.1088/1742-6596/683/1/012010
DO - 10.1088/1742-6596/683/1/012010
M3 - Conference article
AN - SCOPUS:84962840873
SN - 1742-6588
VL - 683
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - 1
M1 - 012010
T2 - TMU International Symposium on New Quantum Phases Emerging from Novel Crystal Structure
Y2 - 24 September 2015 through 25 September 2015
ER -