Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 79, Issue 3, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.79.033705
Keywords
URu2Si2; hidden order; quadrupole ordering; Kondo effect
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Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan [20102002]
- Grants-in-Aid for Scientific Research [20102002] Funding Source: KAKEN
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For more than two decades, the nonmagnetic anomaly observed around 17.5K in URu2Si2, has been investigated intensively. However, any kind of fingerprint for the lattice anomaly has not been observed in the low-temperature ordered phase. Therefore, the order has been called the hidden order''. One simple answer to why the hidden order is still hidden is presented from the space group analysis. The second-order phase transition from I4/mmm (No. 139) to P4(2)/mnm (No. 136) does not require any kind of lattice distortion in this system and allows the NQR frequency at a Ru site unchanged. It is compatible with O-xy-type antiferro-quadrupole ordering with Q=(0,0,1). The characteristics of the hidden order are discussed based on the local 5f(2) electron picture.
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