Experimental Studies of S=1 Heisenberg Planar Antiferromagnetic Chain Ni(C_{11}H_{10}N_{2}O)_{2}Ni(CN)_{4}

• Authors: E. Čizmár , J. Černák , M. Orendáč , T. Herrmannsdörfer , A. Feher
• Languages of publication: EN

Abstracts

EN

In this paper we discuss the results of experimental studies of specific heat and magnetic susceptibility of chain compound Ni(C_{11}H_{10}N_{2}O)_{2}Ni(CN)_{4}. We have observed a Schottky type anomaly at T=2.2 K in a temperature dependence of specific heat and the compound was identified as a S=1 Heisenberg antiferromagnetic chain with the subcritical exchange coupling D/k_{B}=5 K, D/|J|=5.2 and the strong in-plane anisotropy E/k_{B}=2.8 K. It has been found that the in-plane anisotropy affects the region of validity of a diluted exciton model [1] and a strong coupling model [2] for S=1 Heisenberg chains with the strong planar anisotropy. The analysis suggests that the in-plane anisotropy should be considered in any attempt to find a compound potentially located in the boundary of Haldane and "large-D" phases.

Keywords

EN

75.40.Cx; 71.20.Be; 75.50.Ee

Discipline

• 75.50.Ee: Antiferromagnetics
• 75.40.Cx: Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
• 71.20.Be: Transition metals and alloys

• Journal: Acta Physica Polonica A
• Year: 2000
• Volume: 97
• Issue: 3
• Pages: 579-582

Dates

published

2000-03

Contributors

author

E. Čizmár

• Faculty of Science, P.J. Šafárik University, Park Angelinum 9, 04154 Košice, Slovakia

author

J. Černák

• Faculty of Science, P.J. Šafárik University, Park Angelinum 9, 04154 Košice, Slovakia

author

M. Orendáč

• Faculty of Science, P.J. Šafárik University, Park Angelinum 9, 04154 Košice, Slovakia

author

T. Herrmannsdörfer

• Physikalisches Institut, Universität Bayreuth, 95440 Bayreuth, Germany

author

A. Feher

• Faculty of Science, P.J. Šafárik University, Park Angelinum 9, 04154 Košice, Slovakia

Identifiers

DOI

10.12693/APhysPolA.97.579