Anomalous superconductivity and field-induced magnetism in CeCoIn5

T. P. Murphy; Donavan Hall; E. C. Palm; S. W. Tozer; C. Petrovic; Z. Fisk; R. G. Goodrich; P. G. Pagliuso; J. L. Sarrao; J. D. Thompson

doi:10.1103/PhysRevB.65.100514

Anomalous superconductivity and field-induced magnetism in CeCoIn5

T. P. Murphy, Donavan Hall, E. C. Palm, S. W. Tozer, C. Petrovic, Z. Fisk, R. G. Goodrich, P. G. Pagliuso, J. L. Sarrao, J. D. Thompson

DOI 10.1103/PhysRevB.65.100514 · Physical Review B

T1

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Abstract

In the heavy fermion superconductor CeCoIn5 (Tc=2.3 K) the critical field is large, anisotropic, and displays hysteresis. The magnitude of the critical-field anisotropy in the a−c plane can be as large as 7 T and depends on orientation. Critical-field measurements in the (110) plane suggest two-dimensional superconductivity, whereas conventional effective-mass anisotropy is observed in the (100) plane. Two distinct field-induced magnetic phases are observed: Ha appears deep in the superconducting phase, while Hb intersects Hc2 at T=1.4 K and extends well above Tc. These observations suggest the possible realization of a direct transition from ferromagnetism to Fulde-Ferrel-Larkin-Ovchinnikov superconductivity in CeCoIn5.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.3	Pressure not reported	unknown