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
E-mail: gnezdilov@ilt.kharkov.ua

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

Аннотация

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.);
PACS: 63.20.–e Phonons in crystal lattices;
PACS: 78.30.–j Infrared and Raman spectra;
PACS: 75.50.–y Studies of specific magnetic materials.

Ключевые слова: Raman scattering, low-dimensional magnetic systems, phononic and magnetic excitations.