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Zero-Field Ambient-Pressure Quantum Criticality in the Stoichiometric Non-Fermi Liquid System CeRhBi
Anand, Vivek K.,Adroja, Devashibhai T.,Hillier, Adrian D.,Shigetoh, Keisuke,Takabatake, Toshiro,Park, Je-Geun,McEwen, Keith A.,Pixley, Jedediah H.,Si, Qimiao Physical Society of Japan 2018 Journal of the Physical Society of Japan Vol.87 No.6
Anisotropic c − f Hybridization in the Kondo Semiconductor CeFe2Al10
Yuji Muro,Keiske Yutani,Jumpei Kajino,Takahiro Onimaru,Toshiro Takabatake 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We report a single-crystal study on the Kondo semiconductor CeFe2Al10 in which we measuredthe magnetic susceptibility, electrical resistivity, thermopower and thermal conductivity. The highlyanisotropic behavior in all measurements indicates an anisotropic electronic structure that couldoriginate from a c−f hybridization in an orthorhombic YbFe2Al10-type structure. The anisotropicc−f hybridization effect is manifested in the different peak temperatures of the electrical resistivityand the thermopower along the three principal axes.
Evidence of a Rattling Transition in the Caged Compounds LaRu2Zn20 and LaIr2Zn20: 139La NMR Studies
Hideki Tou,Kenji Asaki,Hisashi Kotegawa,Takahiro Onimaru,Keisuke T. Matsumoto,Yukihiro F. Inoue,Toshiro Takabatake 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We report a study of 139La(I=7/2) nuclear magnetic resonance (NMR) to investigate the structuralphase transition in the two caged compounds LaIr2Zn20 and LaRu2Zn20 from microscopic viewpoints. The former compound shows a second-order structural phase transition around Ts = 200 Kwhereas the latter one shows a first-order structural phase transition at Ts = 150 K. For both compounds,quite narrow La-NMR lines of less that 10 kHz without any electric field gradient (EFG) atthe La site were observed at temperatures above Ts, indicating that the local symmetry at the Lasite holds a cubic symmetry. On the other hand, an EFG at La site appears at temperatures belowTs, evidencing symmetry lowering occurs at the La site at temperatures below Ts. At temperaturesaround Ts, both the nuclear spin-lattice relaxation rate (1/T1) and the nuclear spin-spin relaxationrate (1/T2) show unusual enhancements associated with the slowing down of the EFG fluctuations. However, the temperature dependences of 1/T1T and 1/T2 are different from the typical slowingdownphenomena of the EFG fluctuations due to the classical motional narrowing. The lowering ofthe local symmetry at the La site is ascribed to a freezing of the rattling motion.