Interplay of structural distortions, dielectric effects and magnetic order in multiferroic GdMnO3
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- 作者：Mathias Doerr (1)
Michael Loewenhaupt (1)
Aditya A. Wagh (2)
P. S. Anil Kumar (2)
Suja Elizabeth (2)
Sahana Roessler (3)
Martin Rotter (3)
Steffen Wirth (3) - 关键词：Manganites ; Magnetostriction ; Dielectric properties ; Dilatometry
- 刊名：Journal of the Korean Physical Society
- 出版年：2013
- 出版时间：May 2013
- 年：2013
- 卷：62
- 期：10
- 页码：1449-1452
- 全文大小：261KB
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Michael Loewenhaupt (1)
Aditya A. Wagh (2)
P. S. Anil Kumar (2)
Suja Elizabeth (2)
Sahana Roessler (3)
Martin Rotter (3)
Steffen Wirth (3)
1. Institut f眉r Festk枚rperphysik, Technische Universit盲t Dresden, D-01062, Dresden, Germany
2. Department of Physics, Indian Institute of Science, Bangalore, 560012, India
3. Max-Planck-Institut f眉r Chemische Physik fester Stoffe, D-01187, Dresden, Germany - ISSN：1976-8524
文摘
Multiferroic materials are characterized by simultaneous magnetic and ferroelectric ordering making them good candidates for magneto-electrical applications. We conducted thermal expansion and magnetostriction measurements in magnetic fields up to 14 T on perovskitic GdMnO3 by highresolution capacitive dilatometry in an effort to determine all longitudinal and transversal components of the magnetostriction tensor. Below the ordering temperature T N = 42 K, i.e., within the different complex (incommensurate or complex) antiferromagnetic phases, lattice distortions of up to 100 ppm have been found. Although no change of the lattice symmetry occurs, the measurements reveal strong magneto-structural phenomena, especially in the incommensurate sinusoidal antiferromagnetic phase. A strong anisotropy of the magnetoelastic properties was found, in good agreement with the type and propagation vector of the magnetic structure. We demonstrate that our capacitive dilatometry can detect lattice expansion effects and changes of the dielectric permittivity simultaneously because the sample is housed inside the capacitor. A separation of both effects is possible by shielding the sample. Dielectric transitions could be detected by this method and compared to the critical values of H and T in the magnetic phase diagram. Dielectric changes measured at 1 kHz excitation frequency are detected in GdMnO3 at about 180 K, and between 10 K and 25 K in the canted antiferromagnetic structure which is characterized by a complex magnetic order on both the Gd- and Mn-sites.