Magnetoresistance induced by low-field control of phase separation in La0.5Ca0.5MnO3 -: art. no. 144419

被引：38

作者：

Parisi, F

Levy, P

Ghivelder, L

Polla, G

Vega, D

机构：

[1] Comis Nacl Energia Atom, Dept Fis, RA-1650 Buenos Aires, DF, Argentina

[2] Univ Fed Rio de Janeiro, Inst Fis, BR-21945970 Rio De Janeiro, Brazil

[3] Univ Nacl Gral San Martin, EcyT, San Martin, Argentina

[4] Consejo Nacl Invest Cient & Tecn, CIC, RA-1033 Buenos Aires, DF, Argentina

来源：

PHYSICAL REVIEW B | 2001年 / 63卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.63.144419

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of low magnetic fields on the transport properties of a manganite compound with magnetic phase separation is studied. The different behavior obtained in samples of La0.5SCa0.5MnO3 related to the way in which the low field is applied is consistent with a picture of changes in the metallic fraction induced by the magnetic field in a field-cooled cycle. Using a simple model of conduction through a binary mixture, the interrelation between magnetoresistance, metallic fraction, and percolation temperature is accounted for. A different physical coefficient relating magnetic field and metallic fraction emerges as the relevant parameter in the description of phase separated manganites.

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页数：5

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