Colossal Magnetoresistance of Layered Manganite La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7} and Its Description by a “Spin–Polaron” Conduction Mechanism
Journal Article
·
· Physics of the Solid State
- Russian Academy of Sciences, Mikheev Institute of Metal Physics, Ural Branch (Russian Federation)
The resistance of a La{sub 1.2}Sr{sub 1.8}Mn{sub 2(1–z)}O{sub 7} single crystal has been studied in magnetic fields from 0 to 90 kOe. The magnetoresistance at temperature T = 75 K, near which a colossal magnetoresistance maximum is observed, has been successfully described in terms of the “spin–polaron” electric conduction mechanism. This value of the colossal magnetoresistance is due to a three-fold increase in the polaron size. The method of separating contributions of various conduction mechanisms to the magnetoresistance developed for materials with activation type of conduction is generalized to compounds in which a metal–insulator transition is observed. It is found that, at a temperature of 75 K, the contribution of the “orientation” mechanism is maximum (≈20%) in a magnetic field of 5 kOe and almost disappears in fields higher than 50 kOe.
- OSTI ID:
- 22770971
- Journal Information:
- Physics of the Solid State, Journal Name: Physics of the Solid State Journal Issue: 6 Vol. 60; ISSN 1063-7834
- Country of Publication:
- United States
- Language:
- English
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