Muon spin spectroscopy study of hidden order state of URu2Si2

2014 Fiscal Year Final Research Report

• Project/Area Number: 25800211
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II
• Research Institution: University of Hyogo (2014); Institute of Physical and Chemical Research (2013)
• Principal Investigator: KAWASAKI IKUTO 兵庫県立大学, 物質理学研究科, 助教 (90552307)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 重い電子系 / 隠れた秩序 / 異方的超伝導 / ウラン化合物

Outline of Final Research Achievements

The heavy-fermion compound URu2Si2 shows a mysterious second-order transition at 17.5 K. Despite intensive studies for about three decades, the order parameter of the transition at 17.5 K has not yet been identified, and thus the ordered phase is referred to as the hidden order. In the present study, we have performed muon spin relaxation experiments in order to investigate the presence of a time-reversal symmetry-breaking field in the hidden order and superconducting states of URu2Si2. The development of a tiny static internal magnetic field is observed in the hidden order state. We also found that the internal field is further enhanced in the superconducting phase. These findings provide the basis for the understanding of the hidden order and superconducting states.

Free Research Field

数物系科学