In-plane angular dependence of the upper critical field in CeCoIn5

Franziska Weickert, Philipp Gegenwart, Hyekyung Won, David Parker, Kazumi Maki

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22 Scopus citations

Abstract

The tetragonal CeCoIn5 is an unconventional d -wave heavy-fermion superconductor with Tc =2.3 K. Strong Pauli limiting causes a first-order superconducting transition for fields close to Hc2 (0) and evidence for a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state has been found at low temperatures. Here, we present a study of the in-plane angular dependence of the upper critical field. At T=0.1 K a fourfold oscillation of 1.2% amplitude with maxima along the [100] direction is observed. This points toward a d x2 - y2 order-parameter symmetry. The data are compared with theoretical calculations including the FFLO state and a tiny anisotropy of the g factor.

Original languageEnglish
Article number134511
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume74
Issue number13
DOIs
StatePublished - 2006
Externally publishedYes

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