Heat capacity of URu<sub>2-x</sub>Os<sub>x</sub>Si<sub>2</sub> at low temperatures

ORAL

Abstract

We will present the results of the measurements of the heat capacity as a function of temperature on URu2-xOsxSi2 alloys.  Our experimental results show that the critical temperature of the second-order phase transition increases while the value of the Sommerfeld coefficient in the ordered state decreases with 

an increase in osmium concentration. We also observe the increase in the values of the heat capacity at the critical temperature as well as a broadening

of the critical fluctuations region with an increase in x. We analyze the experimental data using the Haule-Kotliar model which, in particular, identifies the 

'hidden order' transition in the parent material URu2Si2 as a transition to a state with nonzero hexadecapole moment. We will demonstrate that our experimental 

results are consistent with the predictions of that model.

*The work at Kent State University was financially supported by the National Science Foundation under grants DMR-1904315 (D.L.K. and C.C.A.) and NSF-DMR-2002795 (S.R.P. and M.D.). Research at the University of California, San Diego was supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), under Grant No. DE-FG02-04ER46105 (single crystal growth), and by the National Science Foundation (NSF) under Grant No. DMR-1810310 (physical properties measurements). Research at the National High Magnetic Field Laboratory was supported by NSF Cooperative Agreement DMR-1157490, the State of Florida, and the DOE. R.E.B. was supported by the Center for Actinide Science and Technology (CAST), an Energy Frontier Research Center (EFRC) funded by the U.S. DOE, BES, under grant no. DE-SC0016568

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Presenters

  • Dom L Kunwar

    • Kent State University

Authors

  • Dom L Kunwar

    • Kent State University

  • Suman R Panday

    • Kent State University

  • Yuhang Deng

    • University of California, San Diego

  • Sheng Ran

    • Washington University, St. Louis

  • Ryan Baumbach

    • National High Magnetic Field Laboratory
    • NHFML; Florida State University
    • NHMFL; Florida State University

  • M Brian Maple

    • Department of Physics, University of California, San Diego
    • University of California, San Diego
    • University of California - San Diego
    • University of California San Diego

  • Carmen C Almasan

    • Kent State University