Trimer V<SUP>3+</SUP> Spin Singlet State and Pseudo Gap in LiVS<SUB>2</SUB> Studied by <SUP>51</SUP>V and <SUP>7</SUP>Li Nuclear Magnetic Resonance

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  • Tanaka Tetsu
    Department of Quantum Materials Science, University of Tokushima
  • Kawasaki Yu
    Department of Quantum Materials Science, University of Tokushima
  • Endou Shigeki
    Department of Quantum Materials Science, University of Tokushima
  • Kimura Satoshi
    Department of Quantum Materials Science, University of Tokushima
  • Ideta Yukiichi
    Department of Quantum Materials Science, University of Tokushima
  • Kishimoto Yutaka
    Department of Quantum Materials Science, University of Tokushima
  • Ohno Takashi
    Department of Quantum Materials Science, University of Tokushima
  • Katayama Naoyuki
    Department of Advanced Materials Science, University of Tokyo CREST, Japan Science and Technology Agency
  • Nohara Minoru
    Department of Advanced Materials Science, University of Tokyo CREST, Japan Science and Technology Agency
  • Takagi Hidenori
    Department of Advanced Materials Science, University of Tokyo CREST, Japan Science and Technology Agency The Institute of Physical and Chemical Research (RIKEN)

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  • Trimer V[3+] spin singlet state and pseudo gap in LiVS2 studied by 51V and 7Li nuclear magnetic resonance

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To clarify the electronic state in a two-dimensional triangular lattice LiVS2, we have performed 51V- and 7Li-NMR measurements. Below the phase transition temperature Tc of about 310 K from the paramagnetic state to a nonmagnetic state, the Knight shift of both 51V and 7Li does not depend on temperature. The 51V and 7Li spin–lattice relaxation rates 1⁄T1 show the exponential temperature dependence below Tc, which indicates a gap structure of the electronic state. These results are in agreement with a trimer singlet of V3+ spins below Tc. The increase in 7Li 1⁄T1 above Tc indicates the existence of the pseudo gap and agrees with the increase in paramagnetic susceptibility with increasing temperature and with the small entropy change at Tc compared with that in LiVO2.

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