Collapse of Ferromagnetism and Fermi Surface Instability near Reentrant Superconductivity of URhGe

A. Gourgout, A. Pourret, G. Knebel, D. Aoki, G. Seyfarth, and J. Flouquet
Phys. Rev. Lett. 117, 046401 – Published 22 July 2016
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Abstract

We present thermoelectric power and resistivity measurements in the ferromagnetic superconductor URhGe for a magnetic field applied along the hard magnetization b axis of the orthorhombic crystal. Reentrant superconductivity is observed near the spin reorientation transition at HR=12.75T, where a first order transition from the ferromagnetic to the polarized paramagnetic state occurs. Special focus is given to the longitudinal configuration, where both the electric and heat current are parallel to the applied field. The validity of the Fermi-liquid T2 dependence of the resistivity through HR demonstrates clearly that no quantum critical point occurs at HR. Thus, the ferromagnetic transition line at HR becomes first order implying the existence of a tricritical point at finite temperature. The enhancement of magnetic fluctuations in the vicinity of the tricritical point stimulates the reentrance of superconductivity. The abrupt sign change observed in the thermoelectric power with the thermal gradient applied along the b axis together with the strong anomalies in the other directions is definitive macroscopic evidence that in addition a significant change of the Fermi surface appears through HR.

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  • Received 9 March 2016

DOI:https://doi.org/10.1103/PhysRevLett.117.046401

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

A. Gourgout1,2, A. Pourret1,2,*, G. Knebel1,2, D. Aoki1,2,3, G. Seyfarth4,5, and J. Flouquet1,2

  • 1University Grenoble Alpes, INAC-PHELIQS, F-38000 Grenoble, France
  • 2CEA, INAC-PHELIQS, F-38000 Grenoble, France
  • 3Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
  • 4University Grenoble Alpes, LNCMI, F-38042 Grenoble Cedex 9, France
  • 5CNRS, Laboratoire National des Champs Magnétiques Intenses LNCMI (UJF, UPS, INSA), UPR 3228, F-38042 Grenoble Cedex 9, France

  • *alexandre.pourret@cea.fr

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Issue

Vol. 117, Iss. 4 — 22 July 2016

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