Magnetism

Spontaneous generation of electric voltage in a single crystal of Sm$_{0.55}$Sr$_{0.45}$MnO$_3$

D. M. Zashchirinskii^a, L. I. Koroleva^a, A. S. Morozov^a, R. Shimchak<sup>b

a</sup> Lomonosov Moscow State University
^b Institute of Physics, Polish Academy of Sciences, Warszawa, 02-668, Poland

Abstract: Spontaneous generation of electric voltage has been found in a Sm$_{0.55}$Sr$_{0.45}$MnO$_3$ single crystal grown by floating zone melting with cooling in oxygen. The maximum voltage of 60 $\mu$V has been observed in the region of temperatures corresponding, simultaneously, to destruction of the CE-type antiferromagnetic ordering and charge ordering in some clusters. The maximum voltage remains unchanged for 24 h and decreases by 45% in a magnetic field of 14.2 kOe. It has been shown that the spontaneous voltage is caused by the presence of regions with different electric charges in the sample.

Received: 11.01.2011
Accepted: 22.03.2011

 English version: Physics of the Solid State, 2011, 53:10, 2038–2041

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