Thermal expansion near the bicritical point in YbAgGe

ORAL

Abstract

A flexible-plate capacitive dilatometer, designed to operate while immersed in the liquid helium ``mash'' of a top-loading dilution refrigerator, was used to measure the thermal expansion of the heavy-fermion antiferromagnet YbAgGe near the bicritical point reported near 0.3 K in a magnetic field of 4.5 T applied parallel to the ab-axis [1]. We will discuss the phase diagram and quantum bicriticality of YbAgGe and the new dilatometer.

[1] Y. Tokiwa et al. Phys. Rev. Lett. 111, 116401 (2013).

*Work at Occidental College was supported by the National Science Foundation under DMR-1408598. A portion of this work was performed at the National High Magnetic Field Laboratory, which is supported by the National Science Foundation Cooperative Agreement No. DMR-1157490 and the State of Florida. Work at Ames Laboratory was supported by the Department of Energy, Basic Energy Sciences under Contract No. DE-AC02-07CH11358.

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Presenters

  • George Schmiedeshoff

    • Department of Physics, Occidental College
    • Physics, Occidental College

Authors

  • George Schmiedeshoff

    • Department of Physics, Occidental College
    • Physics, Occidental College

  • J.-H. Park

    • National High Magnetic Field Laboratory

  • D. Graf

    • National High Magnetic Field Laboratory

  • S.L. Bud'ko

    • Physics and Astronomy, Ames Laboratory and Iowa State University

  • P.C. Canfield

    • Iowa State University
    • Physics and Astronomy, Ames Laboratory and Iowa State University