Abstract
By analyzing the NMR line shape, the transformation of a spatially spin-modulated magnetic structure in BiFeO3 into an ordinary spatially uniform structure of the LaFeO3 orthoferrite in Bi1−x LaxFeO3 solid solutions is studied. The measurements are made using a spin-echo technique at temperatures of 77 and 4.2 K on ceramics with compositions x=0, 0.1, 0.2, 0.61, 0.9, and 1.0 enriched by the 57Fe isotope. It is shown that the spin-modulated structure disappears near the concentration x=0.2, which corresponds, according to the published data, to the phase transition with a change in the unit-cell symmetry R3c → C222. A formula is obtained describing the NMR absorption line shape for the spin-modulated structure with account of local line-width. Theoretical spectra adequately describe the evolution of the experimental spectrum in the concentration range 0≤x≤0.2. Highly nonuniform local magnetic fields in the intermediate compositions make it impossible to detect NMR signals in a sample with x=0.61. A uniform magnetic structure characterized by a single narrow line arises in the range of existence of a phase with the symmetry Pnma typical of the pure orthoferrite LaFeO3.
Similar content being viewed by others
References
Yu. N. Venevtsev, V. V. Gagulin, and V. R. Lyubimov, Magnetoelectrics (Nauka, Moscow, 1982).
I. Sosnowska, T. Peterlin-Neumaier, and E. Steichele, J. Phys. C 15, 4835 (1982).
I. Sosnowska and A. K. Zvezdin, J. Magn. Magn. Mater. 140–144, 167 (1995).
M.-M. Tehranchi, N. F. Kubrakov, and A. K. Zvezdin, Ferroelectrics 204, 181 (1997).
Yu. F. Popov, A. K. Zvezdin, G. P. Vorob’ev, et al., Pis’ma Zh. Éksp. Teor. Fiz. 57(1), 65 (1993) [JETP Lett. 57, 69 (1993)].
Yu. F. Popov, A. M. Kadomtseva, G. P. Vorob’ev, and A. K. Zvezdin, Ferroelectrics 162, 135 (1994).
A. M. Kadomtseva, Yu. F. Popov, G. P. Vorob’ev, and A. K. Zvezdin, Physica B (Amsterdam) 211, 327 (1995).
A. V. Zalessky, A. A. Frolov, T. A. Khimich, et al., Europhys. Lett. 50(4), 547 (2000).
A. V. Zalesskii, A. K. Zvezdin, A. A. Frolov, and A. A. Bush, Pis’ma Zh. Éksp. Teor. Fiz. 71(11), 682 (2000) [JETP Lett. 71, 465 (2000)].
Yu. E. Roginskaya, Yu. N. Venevtsev, S. A. Fedulov, and G. S. Zhdanov, Kristallografiya 8(4), 610 (1963) [Sov. Phys. Crystallogr. 8, 490 (1963)].
Yu. E. Roginskaya, Yu. N. Venevtsev, and G. S. Zhdanov, Zh. Éksp. Teor. Fiz. 44(4), 1418 (1963) [Sov. Phys. JETP 17, 955 (1963)].
M. Polomska, W. Kaczmarek, and Z. Pajak, Phys. Status Solidi A 23, 567 (1974).
V. A. Murashov, D. N. Rakov, I. S. Dubenko, et al., Kristallografiya 35(4), 912 (1990) [Sov. Phys. Crystallogr. 35, 538 (1990)].
Z. V. Gabbasova, M. D. Kuz’min, A. K. Zvezdin, et al., Phys. Lett. A 158, 491 (1991).
I. Sosnovska, R. Przenioslo, F. Fisher, and V. A. Murashov, J. Magn. Magn. Mater. 160, 384 (1996).
M. A. Butler, Int. J. Magn. 4, 131 (1973).
Author information
Authors and Affiliations
Additional information
__________
Translated from Fizika Tverdogo Tela, Vol. 45, No. 1, 2003, pp. 134–138.
Original Russian Text Copyright © 2003 by Zalesskii, Frolov, Khimich, Bush.
Rights and permissions
About this article
Cite this article
Zalesskii, A.V., Frolov, A.A., Khimich, T.A. et al. Composition-induced transition of spin-modulated structure into a uniform antiferromagnetic state in a Bi1−x LaxFeO3 system studied using 57Fe NMR. Phys. Solid State 45, 141–145 (2003). https://doi.org/10.1134/1.1537425
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1134/1.1537425