Large Low-Field Magnetoresistance Observed in Polycrystalline La0.7Ca0.3MnO3 Films

Chin. Phys. Lett.

1999, Vol. 16

Issue (1): 59-61 DOI:

Original Articles

Large Low-Field Magnetoresistance Observed in Polycrystalline La_0.7Ca_0.3MnO₃ Films

WANG Zhi-hai¹;LIAN Gui-jun¹;GAO Ju²;ZHOU Ya-qin¹;KANG Jin-feng¹;LI Mei-ya^1,3;XIONG Guang-cheng¹

¹Department of Physics, Peking University, Beijing 100871 ²Department of Physics, University of Hong Kong, Pokfulam Road, Hong Kong ³Department of Physics, Shantou University, Shantou 515063

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WANG Zhi-hai, LIAN Gui-jun, GAO Ju et al 1999 Chin. Phys. Lett. 16 59-61

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Abstract Large low-field magnetoresistance (LFMR) of ∆p/pH = 40% is obtained at 163 K within ±3000 Oe in a polycrystalline La_0.7Ca_0.3MnO₃ (LCMO) films prepared by pulsed laser deposition. The ratio ∆p/pH increases almost linearly with H in the measuring magnetic field range and the peak of LFMR ratios is observed near the resistivity peak temperature, which is different from the observation of spin-polarized intergrain tunnels. This experiment suggests that grain boundaries have large influences on the LFMR. The results indicate that a suitable film process can be used to increase the LFMR of LCMO films.

Keywords: 75.70.Ak 73.50.Jt

Published: 01 January 1999

PACS:	75.70.Ak	(Magnetic properties of monolayers and thin films)
	73.50.Jt	(Galvanomagnetic and other magnetotransport effects)

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https://cpl.iphy.ac.cn/ OR https://cpl.iphy.ac.cn/Y1999/V16/I1/059

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	WANG Zhi-hai
	LIAN Gui-jun
	GAO Ju
	ZHOU Ya-qin
	KANG Jin-feng
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	XIONG Guang-cheng

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