LOW-TEMPERATURE THERMAL AND MAGNETIC-PROPERTIES OF CU-DOPED HALDANE-GAP ANTIFERROMAGNET NENP

Authors
KOBAYASHI TC HONDA H KODA A AMAYA K
Citation
Tc. Kobayashi et al., LOW-TEMPERATURE THERMAL AND MAGNETIC-PROPERTIES OF CU-DOPED HALDANE-GAP ANTIFERROMAGNET NENP, Journal of the Physical Society of Japan, 64(7), 1995, pp. 2609-2613
Citations number
15
Categorie Soggetti
Physics
Journal title
Journal of the Physical Society of Japan → ACNP
ISSN journal
00319015
Volume
64
Issue
7
Year of publication
1995
Pages
2609 - 2613
Database
ISI
SICI code
0031-9015(1995)64:7<2609:LTAMOC>2.0.ZU;2-D
Abstract
Effects of Cu-impurity are studied by heat capacity and susceptibility measurements down to 30 mK on the Haldane-gap antiferromagnet Ni(C2H8 N2)(2)NO2(ClO4) (NENP). We have observed the characteristic heat capac ity and susceptibility which show contributions from free spins of the Cu2+-impurities with S = 1/2 and the fractional spin S = 1/2 states a t the ends of the Ni2+ (S = 1)-chain adjacent to the CU2+-impurities. The present results are explained completely by the phenomenological H amiltonian for a trimmer of S = 1/2 proposed by the ESR study on this system.