Specific heat of URu2Si2 in fields up to 42 T: Clues to the hidden order

Article

关键词: FERMION SUPERCONDUCTOR URU2SI2;    NONTRIVIAL MAGNETIC ORDER;    TEMPERATURE SPECIFIC-HEAT;    TRANSITIONS;    SYSTEM;   

DOI  :  10.1103/PhysRevB.67.014404

来源: SCIE

【 摘 要 】

The large DeltaC observed at 17.5 K in URu2Si2 is inconsistent with the small, 0.04mu(B) 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 DeltaC in single crystal URu2Si2 to magnetic field, which includes a change to DeltaC 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.

【 授权许可】

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