Existence of Anisotropic Spin Fluctuations at Low Temperature in the Normal Phase of the Superconducting Ferromagnet UCoGe

Abstract

Thermal conductivity measurements have been performed on the superconducting ferromagnet UCoGe down to very low temperature and under magnetic field. In addition to the electronic quasiparticle thermal conductivity, additional contributions to the thermal transport are detected: they are sensitive to the amplitude and direction of the magnetic field, and at low temperature, they display a strong anisotropy with the heat current direction. We identify these contributions as arising from magnetic fluctuations. Detection of such fluctuations on the thermal transport in 3D weak ferromagnets is very rare if not unique, and pledges for a strongly itinerant character of the magnetism of UCoGe.

References in corpus (4)

• Superconductivity on the border of weak itinerant ferromagnetism in UCoGe
• Thermal and Electrical Transport across a Magnetic Quantum Critical Point
• Antiferromagnetic criticality at a heavy-fermion quantum phase transition
• Anisotropic magnetic fluctuations in the ferromagnetic superconductor UCoGe studied by angle-resolved ^{59}Co NMR

Cited by in corpus (8)

• Review of U-based Ferromagnetic Superconductors: Comparison between UGe2, URhGe, and UCoGe
• $c$-axis transport in UTe${}_2$: Evidence of Three Dimensional Conductivity Component
• Quantum Criticality in the Ferromagnetic Superconductor UCoGe under Pressure and Magnetic Field
• Thermal conductivity through the quantum critical point in YbRh2Si2 at very low temperature
• Superconducting Gap of UCoGe probed by Thermal Transport
• Low-temperature thermal conductivity of Co${}_{1-x}$M${}_x$Si (M=Fe, Ni) alloys
• Angular variation of the magnetoresistance of the superconducting ferromagnet UCoGe
• Multigap Superconductivity in the Ferromagnetic Superconductor UCoGe Revealed by Thermal Conductivity Measurements