Orbital frustration and resonating valence bond state in the spin-1/2 triangular lattice LiNiO2

被引：88

作者：

Kitaoka, Y ^{[1
]}

Kobayashi, T

Koda, A

Wakabayashi, H

Niino, Y

Yamakage, H

Taguchi, S

Amaya, K

Yamaura, K

Takano, M

Hirano, A

Kanno, R

机构：

[1] Osaka Univ, Grad Sch Engn Sci, Dept Phys Sci, Toyonaka, Osaka 5608531, Japan

[2] Osaka Univ, Res Ctr Mat Sci Extreme Condit, Toyonaka, Osaka 5608531, Japan

[3] Kyoto Univ, Inst Chem Res, Uji, Kyoto 6110011, Japan

[4] Kobe Univ, Fac Sci, Dept Chem, Kobe, Hyogo 6578501, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1998年 / 67卷 / 11期

关键词：

orbital degree of freedom; quantum spin system; triangular lattice; resonating valence bond; NMR; specific heat;

D O I：

10.1143/JPSJ.67.3703

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

From the Li-7 nuclear magnetic resonance (NMR) and specific heat measurements of LiNiO2, consisting of a spin-1/2 triangular lattice, it is demonstrated that the previously suggested spin-glass-like freezing below T-sg = 8 K; which is caused by defects of Li ions; is not the true ground state, but rather a quantum disordered state is realized without a spin gap. This state is characterized by power-law behavior of the temperature dependence of the specific heat below 0.5 K. A spin-liquid state with short-range ferromagnetic correlations is suggested from new insight into the frustration of orbital ordering for doubly degenerate e(g) shells in the triangular lattice.

引用

页码：3703 / 3706

页数：4

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