High-field superconducting transition of CeCoIn5 studied by local magnetic induction measurements

R. Okazaki, H. Shishido, T. Shibauchi, M. Konczykowski, A. Buzdin, and Y. Matsuda
Phys. Rev. B 76, 224529 – Published 28 December 2007

Abstract

To investigate the unusual normal-superconducting phase transition near the upper critical fields at low temperatures of the quasi-two-dimensional heavy fermion compound CeCoIn5, local magnetic induction measurements have been performed by using a micro Hall probe for both Hc and Ha. The local magnetic induction as a function of temperature displays a discontinuous jump at the superconducting phase boundary below the critical temperature T0 approximate to 0.8K for both field directions, indicating a change from the second- to first-order transition and confirming previously reported bulk measurements on CeCoIn5. The magnetic induction data display an unexpected undershoot behavior just below the jump down, which has never been reported in the bulk measurements. This undershoot is observed at the phase boundary between the normal state and the high-field superconducting phase, which has been attributed to the spatially inhomogeneous Fulde-Ferrell-Larkin-Ovchinnikov state. Possible origins of this unusual undershoot behavior are discussed.

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  • Received 16 October 2007

DOI:https://doi.org/10.1103/PhysRevB.76.224529

©2007 American Physical Society

Authors & Affiliations

R. Okazaki1, H. Shishido1, T. Shibauchi1, M. Konczykowski2, A. Buzdin3, and Y. Matsuda1,4

  • 1Department of Physics, Kyoto University, Kyoto 606-8502, Japan
  • 2Laboratorie des Solides Irradiés, CNRS-UMR 7642, and CEA/DSM/DRECAM, Ecole Polytechnique, 91128 Palaiseau, France
  • 3Institut Universitaire de France, Boulevard Saint-Michel, 75005 Paris, France and Université Bordeaux I, CPMOH, UMR 5798, 33405 Talence, France
  • 4Institute for Solid State Physics, University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581, Japan

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Issue

Vol. 76, Iss. 22 — 1 December 2007

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