2003/01/13 by J. S. Kim, D. Hall, P. Kumar +1 · 2 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Iron-based superconductors research #Rare-earth and actinide compounds #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.67.014404
published as Phys. Rev. B 67, 014404 (2003)
openalex publication_date 2003/01/13 · arxiv created 2003/01/14 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The large \ensuremathΔC observed at 17.5 K in URu2Si2 is inconsistent with the small, 0.04\ensuremathμB moment measured for the antiferromagnetism observed starting (perhaps coincidentally) at the same temperature. We report measurements of this specific-heat transition, thought to be due to some hidden order, in magnetic fields between 24 and 42 T, i.e., through the field-region where three metamagnetic transitions are known to occur at 35.8, 37.3, and 39.4 T. The response of \ensuremathΔC in single crystal URu2Si2 to magnetic field, which includes a change to \ensuremathΔC being possibly associated with a first-order phase transition for high fields, is analyzed to shed further light on the possible explanations of this unknown ordering process. At fields above 35 T, a new high-field phase comes into being; the connection between this high-field phase revealed by the specific heat and earlier magnetization data is discussed.