Trimer v 3+ spin singlet state and pseudo gap in LiVS 2 studied by 51v and 7Li nuclear magnetic resonance

Tetsu Tanaka; Yu Kawasaki; Shigeki Endou; Satoshi Kimura; Yukiichi Ideta; Yutaka Kishimoto; Takashi Ohno; Naoyuki Katayama; Minoru Nohara; Hidenori Takagi

doi:10.1143/JPSJ.78.054709

Trimer v ³⁺ spin singlet state and pseudo gap in LiVS ₂ studied by ⁵¹v and ⁷Li nuclear magnetic resonance

Tetsu Tanaka, Yu Kawasaki, Shigeki Endou, Satoshi Kimura, Yukiichi Ideta, Yutaka Kishimoto, Takashi Ohno, Naoyuki Katayama, Minoru Nohara, Hidenori Takagi

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

To clarify the electronic state in a two-dimensional triangular lattice LiVS ₂, we have performed ⁵¹V- and ⁷Li-NMR measurements. Below the phase transition temperature T _c 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/T ₁ show the exponential temperature dependence below T _c, which indicates a gap structure of the electronic state. These results are in agreement with a trimer singlet of V ³⁺ spins below T _c. The increase in ₇Li 1/T ₁ above T _c 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 T _c compared with that in LiVO ₂.

Original language	English
Article number	054709
Journal	journal of the physical society of japan
Volume	78
Issue number	5
DOIs	https://doi.org/10.1143/JPSJ.78.054709
Publication status	Published - May 2009
Externally published	Yes

Keywords

Knight shift
Livs
Spin-lattice relaxation
Trimer spin singlet
Two-dimensional triangular lattice

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.78.054709

Cite this

@article{cbe7953754b7439fabc6403fa418acd1,

title = "Trimer v 3+ spin singlet state and pseudo gap in LiVS 2 studied by 51v and 7Li nuclear magnetic resonance",

abstract = "To clarify the electronic state in a two-dimensional triangular lattice LiVS 2, we have performed 51V- and 7Li-NMR measurements. Below the phase transition temperature T c 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/T 1 show the exponential temperature dependence below T c, which indicates a gap structure of the electronic state. These results are in agreement with a trimer singlet of V 3+ spins below T c. The increase in 7Li 1/T 1 above T c 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 T c compared with that in LiVO 2.",

keywords = "Knight shift, Livs, Spin-lattice relaxation, Trimer spin singlet, Two-dimensional triangular lattice",

author = "Tetsu Tanaka and Yu Kawasaki and Shigeki Endou and Satoshi Kimura and Yukiichi Ideta and Yutaka Kishimoto and Takashi Ohno and Naoyuki Katayama and Minoru Nohara and Hidenori Takagi",

year = "2009",

month = may,

doi = "10.1143/JPSJ.78.054709",

language = "English",

volume = "78",

journal = "journal of the physical society of japan",

issn = "0031-9015",

publisher = "Physical Society of Japan",

number = "5",

}

TY - JOUR

T1 - Trimer v 3+ spin singlet state and pseudo gap in LiVS 2 studied by 51v and 7Li nuclear magnetic resonance

AU - Tanaka, Tetsu

AU - Kawasaki, Yu

AU - Endou, Shigeki

AU - Kimura, Satoshi

AU - Ideta, Yukiichi

AU - Kishimoto, Yutaka

AU - Ohno, Takashi

AU - Katayama, Naoyuki

AU - Nohara, Minoru

AU - Takagi, Hidenori

PY - 2009/5

Y1 - 2009/5

N2 - To clarify the electronic state in a two-dimensional triangular lattice LiVS 2, we have performed 51V- and 7Li-NMR measurements. Below the phase transition temperature T c 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/T 1 show the exponential temperature dependence below T c, which indicates a gap structure of the electronic state. These results are in agreement with a trimer singlet of V 3+ spins below T c. The increase in 7Li 1/T 1 above T c 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 T c compared with that in LiVO 2.

AB - To clarify the electronic state in a two-dimensional triangular lattice LiVS 2, we have performed 51V- and 7Li-NMR measurements. Below the phase transition temperature T c 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/T 1 show the exponential temperature dependence below T c, which indicates a gap structure of the electronic state. These results are in agreement with a trimer singlet of V 3+ spins below T c. The increase in 7Li 1/T 1 above T c 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 T c compared with that in LiVO 2.

KW - Knight shift

KW - Livs

KW - Spin-lattice relaxation

KW - Trimer spin singlet

KW - Two-dimensional triangular lattice

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