1H-NMR spin-lattice relaxation rate of the quantum spin system (CH 3) 2CHNH 3Cu(Cl xBr 1-x) 3 with x = 0 and 0.35

Akira Oosawa, Takao Suzuki, Keishi Kanada, Satoshi Kojima, Takayuki Goto, Hirotaka Manaka

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5 Citations (Scopus)

Abstract

The spin-lattice relaxation rate T 1 -1 of 1H-NMR has been measured in (CH 3 ) 2CHNH 3Cu(Cl xBr l-x) 3 with x - 0 and 0.35, in order to investigate their microscopic magnetism. Previous macroscopic magnetization and specific heat measurements suggested that these two exist in a singlet-dimer phase. The temperature dependence of T 1 -1 in an x - 0 system decreased exponentially toward zero, providing microscopic evidence of a gapped singlet ground state, which is consistent with results of macroscopic experiments. At the same time, in the x = 0.35 system, T 1 -1 showed a sharp peak structure at approximately 7.5 K but no splitting of 1H-NMR spectra, indicative of magnetic ordering. We discuss the observed sharp peak structure in the x - 0.35 system with the soft mode toward the exotic magnetic ground state suggested by recent μSR experiments.

Original languageEnglish
Article number053702
JournalJournal of the Physical Society of Japan
Volume78
Issue number5
DOIs
Publication statusPublished - 2009 May 1

Keywords

  • (CH ) CHNH Cu(Cl Br, )
  • Bond randomness
  • H-NMR
  • Quantum spin system
  • Spin gap
  • Spin-lattice relaxation rate T

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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