OBSERVATION OF EDGE MOMENT S=1/2 IN THE DILUTED HALDANE SYSTEM (CH3)(4)NNI1-XZNX(NO2)(3)

被引：18

作者：

DEGUCHI, H ^{[1
]}

TAKAGI, S ^{[1
]}

ITO, M ^{[1
]}

TAKEDA, K ^{[1
]}

机构：

[1] KYUSHU UNIV, FAC ENGN, DEPT APPL SCI, FUKUOKA 812, JAPAN

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1995年 / 64卷 / 01期

关键词：

HALDANE SYSTEM; VALENCE BOND SOLID MODEL; TMNIN; ESR; MAGNETIZATION; DILUTION EFFECT;

D O I：

10.1143/JPSJ.64.22

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Electron spin resonance (ESR) and magnetization measurements have been performed on the diluted Haldane system (CH3)(4) NNi1-xZnx(NO2)(3) (Zn2+:TMNIN). We observed ESR absorption from the S = 1/2 moment at the end of the Ni2+ chains at low temperatures. The dependence of the ESR absorption intensity on temperature and the concentration of Zn2+ are compared to the theory derived from the valence bond solid (VBS) model by Mitra, Halperin and Affleck (Phys. Rev, B 45 (1992) 5299). The paramagnetic contribution to the magnetization of Zn2+:TMNIN increases with Zn2+ concentration. We find that on average, one S = 1/2 moment appears on each segment of finite chains at low temperatures.

引用

页码：22 / 25

页数：4

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