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This article is cited in 5 scientific papers (total in 5 papers)
International conference ''Phase transitions, critical and nonlinear phenomena in condensed matter'', Makhachkala, September 15-20, 2019
Semiconductors
Description of the colossal magnetoresistance of La$_{1.2}$Sr$_{1.8}$Mn$_{2}$O$_{7}$ based on spin-polaron and orientation conductivity mechanisms in the paramagnetic temperature region
S. A. Gudin, N. I. Solin Institute of Metal Physics, Ural Division of the Russian Academy of Sciences, Ekaterinburg
Abstract:
The resistance of single-crystal La$_{1.2}$Sr$_{1.8}$Mn$_{2}$O$_{7}$ 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 La$_{1.2}$Sr$_{1.8}$Mn$_{2}$O$_{7}$ 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.
Keywords:
colossal magnetoresistance, spin polaron, layered manganites.
Received: 30.12.2019 Revised: 30.12.2019 Accepted: 10.01.2020
Citation:
S. A. Gudin, N. I. Solin, “Description of the colossal magnetoresistance of La$_{1.2}$Sr$_{1.8}$Mn$_{2}$O$_{7}$ based on spin-polaron and orientation conductivity mechanisms in the paramagnetic temperature region”, Fizika Tverdogo Tela, 62:5 (2020), 669–673; Phys. Solid State, 62:5 (2020), 756–760
Linking options:
https://www.mathnet.ru/eng/ftt8419 https://www.mathnet.ru/eng/ftt/v62/i5/p669
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