Possible Octupole Ordering in Phase II of SmRu_4P_<12> Suggested from Elastic Constants(Condensed Matter : Structure, Mechanical and Thermal Properties)

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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.

• 社団法人日本物理学会の論文
• 2005-08-15

著者

• SUGAWARA Hitoshi

  Faculty of Integrated Arts and Sciences, The University of Tokushima

• 山田 道夫

  京都大学数理解析研究所

• SATO Hideyuki

  Graduate School of Tokyo Metropolitan University

• Sanada Shotaro

  Department Of Physics Tokyo Metropolitan University

• Saha S

  Tokyo Metropolitan Univ. Tokyo

• SHIROTANI Ichimin

  Faculty of Engineering Science, Muroran Institute of Technology

• Sekine Chihiro

  Faculty Of Engineering Muroran Institute Of Technology

• Sekine Chihiro

  Muroran Institute Of Technology

• NAKANISHI Yoshiki

  Graduate School of Frontier Materials Function Engineering, Iwate University

• YOSHIZAWA Masahito

  Graduate School of Frontier Materials Function Engineering, Iwate University

• Sugawara H

  Faculty Of Integrated Arts And Sciences The University Of Tokushima

• OIKAWA Masafumi

  Graduate School of Engineering, Iwate University

• SAHA Shanta

  High Energy Accelerator Research Organization (KEK-MSL)

• Oikawa Masafumi

  Department Of Materials Science And Engineering Iwate University

• Nakanishi Yoshiki

  Graduate School Of Frontier Materials Function Engineering Iwate University

• Yoshizawa Masahito

  Graduate School Of Frontier Materials Function Engineering Iwate University

• Sugawara Hitoshi

  Faculty Of Engineering Iwate University

• Shirotani I

  Department Of Electric And Electronic Engineering Muroran Institute Of Technology

• Shirotani Ichimin

  Faculty Of Engineering Muroran Institute Of Technology

• Sakata H

  Department Of Physics Tokyo Institute Of Technology

• Yoshizawa Masahito

  Department Of Materials Science And Engineering Iwate University

• Oikawa M

  Department Of Applied Chemistry National Defense Academy

• Sato Hideyuki

  Graduate School Of Science Tokyo Metropolitan University

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