Chin. Phys. Lett.  2010, Vol. 27 Issue (9): 097504    DOI: 10.1088/0256-307X/27/9/097504
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Modulation of Insulator-Metal Transition Temperature by Visible Light in La7/8Sr1/8MnO3 Thin Film

HU Ling1, SUN Yu-Ping1,2, WANG Bo1, LUO Xuan1, SHENG Zhi-Gao1, ZHU Xue-Bin1, SONG Wen-Hai1, YANG Zhao-Rong1, DAI Jian-Ming1

1Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 2High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031
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HU Ling, SUN Yu-Ping, WANG Bo et al  2010 Chin. Phys. Lett. 27 097504
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Abstract

Effects of magnetic field and light illumination on the electrical transport properties of La7/8Sr1/8MnO3 thin film grown on a Si substrate are investigated. The film shows an insulator-metal transition at TP≈191.9 K and a low-temperature resistance minimum at Tmin48 K in darkness. Both magnetic field and light illumination shift the insulator-metal transition temperature TP to be higher, while the low-temperature transport properties of the film induced by them show different trends. That is, the magnetic field and light illumination make the Tmin shift to lower and higher temperatures, respectively. The enhancement of both TP and Tmin under light illumination could be explained in terms of photoinduced hole-doping and demagnetization effects of La7/8Sr1/8MnO3.

Keywords: 75.47.Lx      72.40.+w      73.50.-h     
Received: 22 March 2010      Published: 25 August 2010
PACS:  75.47.Lx (Magnetic oxides)  
  72.40.+w (Photoconduction and photovoltaic effects)  
  73.50.-h (Electronic transport phenomena in thin films)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/27/9/097504       OR      https://cpl.iphy.ac.cn/Y2010/V27/I9/097504
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HU Ling
SUN Yu-Ping
WANG Bo
LUO Xuan
SHENG Zhi-Gao
ZHU Xue-Bin
SONG Wen-Hai
YANG Zhao-Rong
DAI Jian-Ming
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