Possible octupole ordering in phase II of SmRu4P12 suggested from elastic constants

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概要

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• We have studied the origin of the successive phase transitions in filled skutterudite SmRu_4P_<12> based on the results of elastic constant measurements. The temperature dependence of the elastic constants shows a sharp drop at the metal-insulator (M-I) transition of T_<MI>=16.5K in a zero field. The successive transition at T_N=14K is indistinct in a low field. The anomaly at T_<MI> disappears with increasing field. A clear softening toward T_N appears in the elastic constants in a high magnetic field. This result suggests a breakdown of the time reversal symmetry in the temperature range between T_<MI> and T_N. Such a breakdown is considered to be due to the coupling between the dipole moment and the octupole moment, which is allowed only in T_h symmetry.

• 一般社団法人日本物理学会の論文
• 2005-08-15

著者

• OIKAWA Masafumi

  Graduate School of Engineering, Iwate University

• Sugawara H

  Faculty Of Engineering Iwate University

• Sato H

  Graduate School Of Bio-applications And Systems Engineering Tokyo University Of Agriculture And Tech

• Sekine C

  Faculty Of Engineering Science Muroran Institute Of Technology

• Shirotani I

  Faculty Of Engineering Science Muroran Institute Of Technology

• Yoshizawa Masahito

  Graduate School of Engineering, Iwate University, Morioka 020-8551

• Nakanishi Yoshiki

  Graduate School of Engineering, Iwate University, Morioka 020-8551, Japan

• Saha SR

  High Energy Accelerator Research Organization (KEK-MSL)

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