Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 15    No. 2    April 2005

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Structure and magnetic properties of Mn-doped CuO solids
FAN Chong-fei(范崇飞)1, PAN Li-qing(潘礼庆)1,3, ZHU Hao(朱 浩)3
QIU Hong-mei(邱红梅)1, WANG Feng-ping(王风平)1
WU Ping(

1. Department of Physics, University of Science and Technology Beijing, 
Beijing 100083, China; 
2. Department of Materials Physics and Chemistry, 
University of Science and Technology Beijing, Beijing 100083, China; 
3. Department of Physics and Astronomy, University of Delaware, 
Newark 19716, USA

Abstract: The CuO doped with 5%-20% Mn(molar fraction) solids were sintered from CuO and MnO2 powder at high temperature(1273K) for 8h. X-ray diffraction was used to determine the solid crystallinity and to address the formation of secondary phases. It is found that it is difficult to achieve pure Cu1-xMnxO phase using standard solid phase reaction. However, sintering under a pressure of 27.7MPa significantly reduces the undesirable second phase CuMn2O4, providing a route to achieve pure Cu1-xMnxO phase. SQUID magnetometry was employed to characterize the magnetic properties. Mn-doped CuO presents ferromagnetic characteristics below 70K. Electrical transport properties were measured in a current-perpendicular-to-plane(CPP) geometry using the PPMS, which suggests variable-range hopping mechanism.

 

Key words: Mn-doped CuO; diluted magnetic semiconductor; solid crystallinity; hopping mechanism

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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