Low Temperature Physics: 38, 559 (2012); https://doi.org/10.1063/1.4734010 (11 pages)
Физика Низких Температур: Том 38, Выпуск 7 (Июль 2012), c. 715-727 ( к оглавлению , назад )
Low-dimensional magnetism of spin-½ chain systems α- and β-TeVO4: a comparative study
V. Gnezdilov1,2, P. Lemmens2, D. Wulferding2, Yu. Pashkevich3, K. Lamonova3, K.-Y. Choi4, O. Afanasiev1, S. Gnatchenko1, and H. Berger5
1B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
2Institute for Condensed Matter Physics, Braunschweig University of Technology Braunschweig D-38106, Germany
3Donetsk O.O. Galkin Institute of Physics and Engineering of National Academy of Sciences of Ukraine 72 R. Luxemburg Str., Donetsk 83114, Ukraine
4Department of Physics, Chung-Ang University, 221 Huksuk-Dong, Dongjak-Gu, Seoul 156–756, Republic of Korea
5Inst. Phys. Mat. Complexe, EPFL, Lausanne CH–1015, Switzerland
Received April 4, 2012
We present a comparative study of the low-dimensional compounds α- and β-TeVO4. Our data clearly show that the change in the local coordination geometry of V4+ ions comparing α- and β-TeVO4 leads to a drastic differences in the magnetic properties. Despite sharing the same crystal structure, the two compounds realize different magnetic exchange topologies. Both compounds exhibit a transition from ferro- to antiferromagnetic correlations with decreasing temperature. This effect however is driven by different mechanisms for both compounds. Additionally, a dimensional crossover is found in β-TeVO4.
PACS: 75.40.Gb Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.);
Ключевые слова: Raman scattering, low-dimensional magnetic systems, phononic and magnetic excitations.