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Angular Dependent Magnetorestriction Study Of Cecoin5, Catalin Martin, Victor Correa, Kenneth Purcell, Timothy Timothy, Eric Palm, Stanley Tozer, George Schmiedeshoff, J Cooley

George Schmiedeshoff

Using a capacitive dilatometer designed to operate on the rotating stage of a top loading dilution refrigerator probe, we measured the magnetorestriction ( L(H)-L(0))/L(0), of the Heavy Fermion Superconductor CeCoIn5, along all three crystallographic direction, and with the magnetic field applied parallel both to the superconducting ab-planes and to the c-axis. When B||ab, the c-axis magnetorestriction features, besides a sharp jump at the upper critical field, a continuous, second-order like, transition at a lower field, which is consistent with previous observations from specific heat measurements. Our results are consistent with a field induced modulation of the superconducting order parameter (FFLO …