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Description of the Colossal Magnetoresistance of La1.2Sr1.8Mn2O7 Based on Spin-Polaron and Orientation Conductivity Mechanisms in the Paramagnetic Temperature Region

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Abstract

The resistance of single-crystal La1.2Sr1.8Mn2(1 – z)O7 is studied experimentally and theoretically in the 75–300 K temperature range in magnetic fields varying in intensity from 0 to 90 kOe. The magnetoresistance is governed by spin-polaron and orientation conductivity mechanisms. The observed magnetoresistance of La1.2Sr1.8Mn2O7 at 75–300 K is characterized using the method of separation of contributions from different conductivity mechanisms. The calculated and experimental data agree closely. Temperature dependences of the spin-polaron size (in relative units) are calculated in the 75–300 K interval in zero magnetic field and in a 90 kOe field. It is demonstrated that the increasing (along the magnetic field) spin-polaron linear size gives rise to colossal magnetoresistance. In other words, the size change of magnetic inhomogeneities produces the primary contribution to the colossal magnetoresistance value.

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ACKNOWLEDGMENTS

The authors wish to thank K.I. Kugel’ for insightful remarks made in discussing the obtained results.

Funding

This study was conducted as part of state task “Kvant” no. АААА-А18-118020190095-4 from the Ministry of Education and Science of the Russian Federation with partial support from the Russian Foundation for Basic Research (project no. 19-02-01000) and the Ural Branch of the Russian Academy of Sciences (project no. 18-2-2-11).

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  1. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, 620108, Yekaterinburg, Russia

    S. A. Gudin & N. I. Solin

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  1. S. A. Gudin
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  2. N. I. Solin
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Correspondence to S. A. Gudin.

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Translated by D. Safin

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Gudin, S.A., Solin, N.I. Description of the Colossal Magnetoresistance of La1.2Sr1.8Mn2O7 Based on Spin-Polaron and Orientation Conductivity Mechanisms in the Paramagnetic Temperature Region. Phys. Solid State 62, 756–760 (2020). https://doi.org/10.1134/S1063783420050091

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