Exploring the fragile antiferromagnetic superconducting phase in CeCoIn5

Details Exploring the fragile antiferromagnetic superconducting phase in CeCoIn5 Exploring the fragile antiferromagnetic superconducting phase in CeCoIn5

2010-09-15

arxiv.org/abs/1009.2883v1

Physical Review Letters 105, 187001 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

Accepted Physical Review Letters, September 2010. 4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.105.187001

CeCoIn5 is a heavy fermion Type-II superconductor which exhibits clear indications of Pauli-limited superconductivity. A variety of measurements give evidence for a transition at high magnetic fields inside the superconducting state, when the field is applied either parallel to or perpendicular to the c axis. When the field is perpendicular to the c axis, antiferromagnetic order is observed on the high-field side of the transition, with a magnetic wavevector of (q q 0.5), where q = 0.44 reciprocal lattice units. We show that this order remains as the magnetic field is rotated out of the basal plane, but the associated moment eventually disappears above 17 degrees, indicating that the anomalies seen with the field parallel to the c axis are not related to this magnetic order. We discuss the implications of this finding.

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