Specific heat of S=1 quasi-1D antiferromagnet NDMAP in magnetic fields

被引：2
作者：
Tsujii, H
Honda, Z
Andraka, B
Katsumata, K
Takano, Y
机构：
[1] Univ Florida, Dept Phys, Gainesville, FL 32611 USA
[2] Saitama Univ, Fac Engn, Urawa, Saitama 3388570, Japan
[3] RIKEN, Harima Inst, Sayo, Hyogo 6795148, Japan
来源：
PHYSICA B-CONDENSED MATTER | 2003年 / 329卷
关键词：
haldane gap; low-dimensional magnetism; magnetic ordering;
D O I：
10.1016/S0921-4526(02)02041-0
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
NDMAP, Ni(C5H14N2)(2)N-3(PF6), is a quasi-one-dimensional S = 1 Heisenberg antiferromagnet with Haldane-gap energies of 22 and 5.5 K for excitations polarized parallel and perpendicular to the chain c-axis, respectively. We have extended the specific-heat measurements by Honda et al. in this compound to 150 mK in temperature and 18 T in magnetic field, employing a novel relaxation calorimeter. The experiment provides an accurate determination of the exponent for the transition line for the field-assisted ordered phase. In addition, a new feature has been found in the phase diagram at around 14 T. (C) 2003 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：975 / 976
页数：2
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