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Anomalous superconductivity and field-induced magnetism in CeCoIn5

Phys. Rev. B 65, 100514(R) – Published 1 March 2002
T. P. Murphy, Donavan Hall, E. C. Palm, S. W. Tozer, C. Petrovic, Z. Fisk, R. G. Goodrich, P. G. Pagliuso, J. L. Sarrao, and J. D. Thompson

Abstract

In the heavy fermion superconductor CeCoIn5 (Tc=2.3K) 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=1.4K 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.

DOI: http://dx.doi.org/10.1103/PhysRevB.65.100514

  • Received 27 December 2001
  • Published 1 March 2002

© 2002 The American Physical Society

Authors & Affiliations

T. P. Murphy, Donavan Hall, E. C. Palm, S. W. Tozer, C. Petrovic*, and Z. Fisk

  • National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310

R. G. Goodrich

  • Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803-4001

P. G. Pagliuso, J. L. Sarrao, and J. D. Thompson

  • Los Alamos National Laboratory, Los Alamos, New Mexico 87545

  • *Present address: Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, IA 50011.

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