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Angular dependent magnetothermal conductivity experiments on CeCoIn_5indicate that this compound is a d-wave superconductor. In this study, thelow-temperature behavior of the upper critical field is measured in a singlecrystal of CeCoIn_5 along the directions H parallel a and H parallel c. Thedata is compared with model calculations of the upper critical field in ad-wave superconductor. It is found that the observed H_c2(T) along H parallel ais consistent with a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state at lowtemperatures, T < 0.7K, whereas for H parallel c the FFLO state appears to beabsent in CeCoIn_5. Furthermore, it is predicted that the quasiparticle densityof states in the FFLO state exhibits a complex peak structure which should beobservable by scanning tunneling microscopy.Comment: 5 pages RevTex with 3 encapsulated postscript figure

physical review. b, condensed matter and materials physics

Upper critical field and Fulde-Ferrell-Larkin-Ovchinnikov state in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CeCoIn</mml:mi></mml:mrow><mml:mrow><mml:mn>5</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Upper critical field and Fulde-Ferrell-Larkin-Ovchinnikov state inCeCoIn5