Study of spin-gap formation in quasi-two-dimensional S=1/2 system CaV4O9: Neutron scattering and NMR

被引：55

作者：

Kodama, K ^{[1
]}

Harashina, H ^{[1
]}

Sasaki, H ^{[1
]}

Kobayashi, Y ^{[1
]}

Kasai, M ^{[1
]}

Taniguchi, S ^{[1
]}

Yasui, Y ^{[1
]}

Sato, M ^{[1
]}

Kakurai, K ^{[1
]}

Mori, T ^{[1
]}

Nishi, M ^{[1
]}

机构：

[1] UNIV TOKYO, INST SOLID STATE PHYS, MINATO KU, TOKYO 106, JAPAN

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1997年 / 66卷 / 03期

关键词：

CaV4O9; spin gap; neutron inelastic scattering; NMR relaxation rate;

D O I：

10.1143/JPSJ.66.793

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Neutron inelastic scattering study has been performed on aligned single crystals of quasi-two-dimensional spin-gap system CaV4O9. By analyzing the dispersion curves and the structure factor of the triplet excitation, a physical picture of the present spin system has been constructed: The plaquette singlet units of four S = 1/2 V-atoms within four ''corner-linked'' VO5 pyramids form the two-dimensional linkage of the spins by the interactions between the V-spins within the ''edge-linked'' VO5 pyramids. We have remeasured the NMR relaxation rates and obtained the spin-gap behavior consistent with the neutron results.

引用

页码：793 / 802

页数：10

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