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The Influence of Magnetic Inhomogeneous State on Thermopower and Magnetothermopower in Sm0.55Sr0.45MnO3 Manganites

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Abstract:

Thermopower α and magnetothermopower α/α were studied in the single-crystal Sm0.55Sr0.45MnO3 samples, containing clusters of three types: ferromagnetic clusters with the Curie temperature TC = 134 K, A-type antiferromagnetic clusters with the Neel temperature TNA TC and CE-type antiferromagnetic clusters with the TNCE = 240 K. The curves of temperature dependence of α (T) and {α/α}(T) have extrema in the TNCE-region: large maximum on the first and sharp minimum on the second. Negative magnetothermopower in minimum achieves the giant value 50% in magnetic field 13,2 kOe. It is shown that thermopower is essentially caused by the presence of CE-type antiferromagnetic clusters, in which exists charge order, displacing oxygen ions

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Periodical:

Solid State Phenomena (Volume 215)

Pages:

320-324

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.215.320

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Online since:

April 2014

Authors:

Liudmila I. Koroleva, Artiom S. Morozov*, Elina S. Zhakina

Keywords:

Charge Inhomogeneous, Magnetic Inhomogeneous, Magnetization, Magnetothermopower, Manganite, Paramagnetic Susceptibility, Thermopower

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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