Schottky Specific Heat due to the Tunneling Rotation of Methyl Groups in Deuterated (DMe-DCNQI)_2Cu System

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概要

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• In the course of studies on thermal properties of (DMe-DCNQI)_2Cu systems that exhibit a reentrant metal-insulator transition, we discovered a Schottky type of specific heat with a peak around 8 K. The peak value exceeds 25 J/mol・K. This type of anomaly is observed only on samples composed of molecules containing partially deuterated methyl groups, and was found to be originated from the rotation of deuterated methyl groups that occurs by quantum tunneling. From an analysis of the specific heat curve, we obtained information concerning the low lying energy level scheme of deuterated methyl group CH_2D. It has a non-degenerated ground state and doubly degenerated first excited states located about 20 K above the ground state.

• 社団法人日本物理学会の論文
• 2002-07-15

著者

• SAWA Hiroshi

  Photon Factory, Institute of Materials Structure Science

• Sawa H

  Institute Of Materials Structure Science Kek

• Suematsu H

  Spring-8

• Sawa Hiroshi

  Department Of Physics Aoyama-gakuin University

• NISHIO Yutaka

  Faculty of Science, Toho University

• KAJITA Koji

  Faculty of Science, Toho University

• SAWA Hiroshi

  Institute of Materials Structure Science, High Energy Accelerator Research Organization

• Nishio Y

  Department Of Physics Faculty Of Science Toho University

• Aonuma S

  Faculty Of Engineering Osaka Electro-communication University

• Aonuma Shuji

  Institute For Solid State Physics University Of Tokyo

• Aonuma Shuji

  Institute For Solid State Physics The University Of Tokyo

• KOBAYASHI Keisuke

  Japan Synchrotron Radiation Research Institute/SPring-8

• Aonuma Shuji

  Faculty Of Engineering Osaka Electro-communication University

• Koyama K

  Institute For Solid State Physics University Of Tokyo

• Kato R

  Riken (the Institute Of Physical And Chemical Research) Jst-crest

• Koyama K

  Institute For Solid State Physics University:(present)institute Of Materials Research Tohoku Univers

• Tamura Masafumi

  The Institute Of Scientific And Industrial Research Osaka University

• Tamura Masafumi

  Condensed Molecular Materials Lab. Riken

• Kato Reizo

  Condensed Molecular Materials Lab. Riken

• MORI Yuko

  Faculty of Science, Toho University

• SASAKI Sachie

  Faculty of Science, Toho University

• KATO Reizo

  The Institute of Physical and Chemical Research

• Sawa Hiroshi

  Photon Factory Institute Of Materials Structure Science

• Mori Yuko

  Faculty Of Science Toho University

• Sawa Hiroshi

  Institute For Solid State Physics University Of Tokyo

• Sasaki Sachie

  Faculty Of Science Toho University

• Kajita K

  Department Of Physics Faculty Of Science Toho University

• Kajita Koji

  Faculty Of Science Toho University

• Koyama Keiichi

  Tohoku Univ. Sendai Jpn

• Sato Hirohiko

  Department Of Chemistry Graduate School Of Science And Engineering Tokyo Institute Of Technology

• Nishio Y

  Osaka Univ. Toyonaka

• Koyama Keiichi

  High Field Laboratory For Superconducting Materials Institute For Materials Research Tohoku Universi

• Nishio Y

  Toho Univ. Chiba

• Nishio Yuko

  Faculty of Science, Toho University

• Nishino Yutaka

  Department of Physics, Faculty of Science, Toho University

• Koyama Keiichi

  Department of Physics, Faculty of Science, Toho University

• Tamura Masafumi

  Condensed Molecular Materials Lab., RIKEN

• Kato Reizo

  Condensed Molecular Materials Lab., RIKEN

• KOYAMA Keiichi

  High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University

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