Volume 70, Number 3, May 2005
|Page(s)||369 - 375|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||13 April 2005|
Anisotropic spin-Peierls state in the inorganic compound
Institute of Physics - Bijenička c. 46, 10000 Zagreb, Croatia
2 Laboratoire de Phisico-Chimie de l'Etat Solide, Université de Paris Sud Bâtiment 414, 91405 Orsay, France
Corresponding author: email@example.com
Accepted: 15 March 2005
The static susceptibility and susceptibility anisotropy of the single-crystalline were measured. Combined results of both techniques reveal the following experimental facts: i) The low-temperature susceptibility upturn obeys a power law temperature dependence of the form with α an anisotropic exponent. This is, to our knowledge, the first observation of the anisotropic exponent α. ii) In the paramagnetic region above the spin-Peierls transition temperature the measurements reveal the anisotropic and temperature-dependent exchange interaction, J. iii) The anisotropic exchange interaction results in the anisotropy of the excitation energy gap Δ. iv) The paramagnetic defects causing a low-temperature susceptibility upturn are ions, but of different oxygen surroundings than the rest of the moments.
PACS: 75.30.Gw – Magnetic anisotropy / 75.30.Hx – Magnetic impurity interactions / 75.30.Et – Exchange and superexchange interactions
© EDP Sciences, 2005
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