Low temperature specific heat of molecular nanomagnets and the contribution of the internal fields

Authors
Gomes, AM Novak, MA Nunes, WC Rapp, RE
Citation
Am. Gomes et al., Low temperature specific heat of molecular nanomagnets and the contribution of the internal fields, J MAGN MAGN, 226, 2001, pp. 2015-2017
Citations number
7
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
ISSN journal
03048853 → ACNP
Volume
226
Year of publication
2001
Part
2
Pages
2015 - 2017
Database
ISI
SICI code
0304-8853(200105)226:<2015:LTSHOM>2.0.ZU;2-S
Abstract
We present the specific heat measurements at very low temperatures of the s ingle molecule magnets Mn(12)ac and Fe-8. Below 3 K, both systems present s uperparamagnetic blocking effects in zero external magnetic field and an ex cess specific heat contribution around 1 K. The experimental results are ex plained considering a distribution of internal fields of dipolar and hyperf ine origin as well as quantum tunneling of the magnetization. (C) 2001 Else vier Science B.V. All rights reserved.