Fingerprints of field-induced Berezinskii-Kosterlitz-Thouless transition in quasi-two-dimensional S=1/2 Heisenberg magnets Cu(en)(H2O)2SO4 and Cu(tn)Cl2

被引：10
|
作者：
Baranova, Lucia [1 ]
Orendacova, Alzbeta [2 ]
Cizmar, Erik [2 ]
Tarasenko, Robert [2 ,3 ]
Tkac, Vladimir [2 ,3 ]
Orendac, Martin [2 ]
Feher, Alexander [2 ]
机构：
[1] Tech Univ Kosice, Fac Civil Engn, Dept Appl Math, SK-04200 Kosice, Slovakia
[2] Safarik Univ, Fac Sci, Ctr Low Temp Phys, SK-04154 Kosice, Slovakia
[3] Charles Univ Prague, Fac Math & Phys, CR-12116 Prague, Czech Republic
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2016年 / 404卷
关键词：
Specific heat; Two-dimensional; Heisenberg square lattice; Berezinskii-Kosterlitz-Thouless transition; CRITICAL-BEHAVIOR; ANTIFERROMAGNETISM;
D O I：
10.1016/j.jmmm.2015.12.025
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Organo-metallic compounds Cu(en)(H2O)(2)SO4 (en=C2H8N2) and Cu(tn)Cl-2 (tn=C3H10N2) representing S = 1/2 quasi-two-dimensional Heisenberg antiferromagnets with an effective intra-layer exchange coupling J/k(B) approximate to 3 K, have been examined by specific heat measurements at temperatures down to nominally 50 mK and magnetic fields up to 14 T. A comparative analysis of magnetic specific heat in zero magnetic field revealed nearly identical contribution of short-range magnetic correlations and significant differences were observed at lowest temperatures. A phase transition to long-range order was observed in Cu(en)(H2O)(2)SO4 at T-c=0.9 K while hidden in Cu(tn)Cl-2. A response of both compounds to the application of magnetic field has rather universal features characteristic for a field-induced Berezinskii-Kosterlitz-Thouless transition theoretically predicted for ideal two-dimensional magnets. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：53 / 57
页数：5
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