NMR study of quantum spin liquid and its phase transition in the organic spin-1/2 triangular lattice antiferromagnet EtMe3Sb[Pd(dmit) 2]2

Satoru Maegawa, Tetsuaki Itou, Akira Oyamada, Reizo Kato

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2 Citations (Scopus)

Abstract

We found by 13C-NMR experiment that a quasi-two-dimensional organic antiferromagnet with spin 1/2 on the triangular lattice, EtMe 3Sb[Pd(dmit)2]2, has no classical magnetic ordering down to 19.4mK, although the magnetic exchange interaction J is 220-250K. The quantum spin liquid state is realized in this material due to the significant spin frustration and quantum fluctuation. The 13C nuclear spin-lattice relaxation rate T1-1 under an external magnetic field of 7.65T indicates that the excitations have no spin gap in this spin liquid phase above 1.0K. Then the relaxation rate exhibits a clear kink at 1.0K, and shows a steep decrease below this temperature proportional to T 2. This clearly shows a continuous phase transition at 1.0K and the steep decrease of the spin fluctuation could show the appearance of the excitation gap in the lower spin liquid phase. The power law but not exponential law of the temperature dependence may imply a nodal gap rather than a full gap.

Original languageEnglish
Article number012032
JournalJournal of Physics: Conference Series
Volume320
DOIs
Publication statusPublished - 1 Jan 2011
EventInternational Conference on Frustration in Condensed Matter, ICFCM - Sendai, Japan
Duration: 11 Jan 201114 Jan 2011

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