Magnetic properties of the Haldane-gap material [Ni(C2H8N2)2NO2](BF4)

被引：15

作者：

Cizmar, E. ^{[1
]}

Ozerov, M. ^{[1
]}

Ignatchik, O. ^{[1
]}

Papageorgiou, T. P. ^{[1
]}

Wosnitza, J. ^{[1
]}

Zvyagin, S. A. ^{[1
]}

Krzystek, J. ^{[2
]}

Zhou, Z. ^{[3
]}

Landee, C. P. ^{[4
,5
]}

Landry, B. R. ^{[4
,5
]}

Turnbull, M. M. ^{[4
,5
]}

Wikaira, J. L. ^{[6
]}

机构：

[1] Forschungszentrum Dresden Rossendorf, Dresden High Magnet Field Lab, D-01314 Dresden, Germany

[2] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA

[3] Wayne State Univ, Dept Phys & Astron, Detroit, MI 48201 USA

[4] Clark Univ, Dept Phys, Worcester, MA 01060 USA

[5] Clark Univ, Carlson Sch Chem, Worcester, MA 01060 USA

[6] Univ Canterbury, Dept Chem, Christchurch 1, New Zealand

来源：

NEW JOURNAL OF PHYSICS | 2008年 / 10卷

基金：

美国国家科学基金会;

关键词：

D O I：

10.1088/1367-2630/10/3/033008

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Results of magnetization and high-field electron spin resonance (ESR) studies of the new spin-1 Haldane-chain material [Ni(C(2)H(8)N(2))(2)NO(2)](BF(4)) (NENB) are reported. A definite signature of the Haldane state in NENB was obtained. From the analysis of the frequency-field dependence of magnetic excitations in NENB, the spin-Hamiltonian parameters were calculated, yielding Delta/k(B) = 17.4 K, g(parallel to) = 2(14, D/k(B) = 7.5 K and vertical bar E/k(B)vertical bar = 0.7K for the Haldane gap, g factor and the crystal-field anisotropy constants, respectively. The presence of fractional S = 1/2 chain-end states, revealed by ESR and magnetization measurements, is found to be responsible for spin-glass freezing effects. In addition, extra states in the excitation spectrum of NENB have been observed in the vicinity of the Haldane gap; their origin is discussed.

引用

页数：9

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