^<101>Ru NQR and Hidden Order in URu_2Si_2(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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The still unclarified hidden order phase below T_0=17.5K in the heavy-electron system URu_2Si_2 has been studied by ^<101>Ru NQR on a single crystal under H_<ext>=0 and ambient P. Considering an invariant form of the quadrupole coupling between a ^<101>Ru nucleus and U 5f electrons, which is compatible with the symmetry of the U-Ru bonds, it is shown that U 5f quadrupoles can be probed by ^<101>Ru NQR and that the singlet ground-state models for the (5f)^2 configuration of U can naturally explain the observed large T-dependence of the NQR frequency ^<101>ν_<2_Q>(T) above T_0. ^<101>ν_<2_Q>(T) shows a slight but significant increase below T_Q≅13.5K. Combining with general considerations on the effects on ^<101>Ru NQR of a possible symmetry-breaking electric field gradient (EFG) or hyperfine field due to hidden order, we discuss that the increase can be interpreted as arising from symmetry-breaking EFG components of V_<yz> and/or V_<zx> due to quadrupole order. In this interpretation the onset of the quadrupole order is retarded by about 4K below T_0, which is discussed in connection with related measurements.
- 社団法人日本物理学会の論文
- 2005-08-15
著者
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TAKAGI Shigeru
Physics Department, Graduate School of Science, Tohoku University
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Yokoyama Makoto
Faculty Of Science Ibaraki University
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Takagi Shigeru
Physics Department Graduate School Of Science Tohoku University
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AMITSUKA Hiroshi
Division of Physics,Graduate School of Science,Hokkaido University
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SAITOH Satoru
Physics Department, Graduate School of Science, Tohoku University
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Amitsuka Hiroshi
Division Of Physics Graduate School Of Science Hokkaido University
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Saitoh Satoru
Physics Department Graduate School Of Science Tohoku University
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AMITSUKA Hiroshi
Division of Physics, Graduate School of Science, Hokkaido University
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