HEAT-CAPACITY ANOMALY OF HALDANE-GAP ANTIFERROMAGNET NENP BELOW 1K

Authors
KODA A KOBAYASHI T TABUCHI Y AMAYA K YOSIDA T
Citation
A. Koda et al., HEAT-CAPACITY ANOMALY OF HALDANE-GAP ANTIFERROMAGNET NENP BELOW 1K, Physica. B, Condensed matter, 194, 1994, pp. 1261-1262
Citations number
3
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physica. B, Condensed matter → ACNP
ISSN journal
09214526
Volume
194
Year of publication
1994
Part
1
Pages
1261 - 1262
Database
ISI
SICI code
0921-4526(1994)194:<1261:HAOHAN>2.0.ZU;2-6
Abstract
Heat capacity measurements of Haldane-gap antiferromagnetic NENP are p erformed. An anomalous broad peak was observed below 1K besides Schott ky anomaly corresponding to Haldane-gap. This broad peak exists under zero magnetic field and disappears under external magnetic field of 3T . We have also measured the heat capacities of both Cu-doped and Zn-do ped samples, because impurity and end-chain spins may be responsible f or the observed anomaly as well as the possibility of long range order .