Nuclear Magnetic Relaxation of ^1H in the Organic Radical Salts m-MPYNN^+・ClO^-_4 and m-MPYNN^+・BF^-_4 : Condensed Matter: Electronic Properties, etc.

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概要

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• We have measured nuclear spin-lattice relaxation times T_1 of ^1H in the organic salts m-MPYNN^+・ClO^-_4 and m-MPYNN^+・BF^-_4 in the temperature range between 2 K and 100 K under external fields up to 70 kOe. In these salts, two cationic (spin-1/2) radicals constitute a dimer due to the ferromagnetic interaction J_1. We interpreted the experimental results of T^<-1>_1 below about 10K (〜 J_1/k_B ) in terms of two relaxation processes based on the energy levels of the ferromagnetic dimer. The flip-flop and the direct processes which are due to longitudinal and transverse spin fluctuations become dominant at higher and lower fields, respectively, the crossover field being around 10kOe. For the field dependence of T^<-1>_1 at higher temperatures, the spin diffusive model of spin-1/2 in a two-dimensional system is satisfactorily applied.

• 社団法人日本物理学会の論文
• 2000-05-15

著者

• OYAMADA Akira

  Graduate School of Human and Environmental Studies, Kyoto University

• Awaga K

  Graduate School Of Science Nagoya University

• Awaga Kunio

  Department Of Chemistry Graduate School Of Science University Of Nagoya

• Awaga Kunio

  Department Of Basic Science Graduate School Of Arts And Sciences The University Of Tokyo

• Goto Tetsuya

  Plasma Research Center University Of Tsukuba

• Gotoh Takayuki

  Institute For Materials Research Tohoku University

• Goto T

  Nagoya Inst. Technol. Nagoya Jpn

• Goto Takao

  Graduate School Of Human And Environmental Studies Kyoto University

• Goto T

  Univ. Tokyo Tokyo Jpn

• Goto T

  Univ. Tokyo Chiba

• Goto Tsuneaki

  Institute For Solid State Physics University

• Oyamada Akira

  Graduate School Of Human And Environmental Studies Kyoto University

• Goto T

  Institute For Solid State Physics The University Of Tokyo

• Goko T

  Institute For Solid State Physics University Of Tokyo

• OKUNO Tsuyoshi

  Institute of Physics, University of Tsukuba

• Goto Tsuneaki

  The Institute Of Solid State Physics Tokyo University

• Okuno Tsunehisa

  Basic Science Graduate School Of Arts And Sciences University Of Tokyo

• Okuno Tsunehisa

  Department Of Basic Science Graduate School Of Arts And Sciences The University Of Tokyo:(prescnt)dc

• Goto Takao

  Graduate School Fo Human And Environmental Studies Kyoto University

• Oyamada A

  Graduate School Of Human And Environmental Studies Kyoto University

• FUJII Yutaka

  Graduate School of Human and Environmental Studies, Kyoto University

• Goto T

  新潟大院自然

• AWAGA Kunio

  Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo

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