Chin. Phys. Lett.  2001, Vol. 18 Issue (4): 604-607    DOI:
Original Articles |
Delocalizing Effect of Polarons in Colossal Magnetoresistance Material FeCr2S4
YANG Zhao-Rong;TAN Shun;CHEN Zhi-Wen;ZHANG Yu-Heng
Structure Research Laboratory, University of Science and Technology of China, Hefei 230026
Cite this article:   
YANG Zhao-Rong, TAN Shun, CHEN Zhi-Wen et al  2001 Chin. Phys. Lett. 18 604-607
Download: PDF(466KB)  
Export: BibTeX | EndNote | Reference Manager | ProCite | RefWorks
Abstract The electrical transport and magnetic properties of colossal
magnetoresistance material FeCr2S4 are studied. The temperature dependence of resistivity ρ and thermoelectric power S are investigated from 5 to 300 K and from 77 to 300 K, respectively. The activation energy Eρ obtained from ρ-T is larger than the activation energy ES, obtained from S-T. This indicates that magnetic polarons dominate the conduction behaviour at temperatures above Tc. The M-T curve and electron spin resonance spectra show that the paramagnetic-ferromagnetic transition is incomplete, and that a paramagnetic phase coexists with a ferromagnetic phase in a certain temperature range below Tc. It is proposed that the insulator-metal transition near Tc could be attributed to the gradual delocalizing effect from magnetic polarons to naked carriers. The resistivity in the presented temperature range can be described by considering the coexistence of magnetic polarons and naked carriers.

Keywords: 75.50.Gg      75.70.Pa      72.20.-i     
Published: 01 April 2001
PACS:  75.50.Gg (Ferrimagnetics)  
  75.70.Pa  
  72.20.-i (Conductivity phenomena in semiconductors and insulators)  
TRENDMD:   
URL:  
https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2001/V18/I4/0604
Service
E-mail this article
E-mail Alert
RSS
Articles by authors
YANG Zhao-Rong
TAN Shun
CHEN Zhi-Wen
ZHANG Yu-Heng
Related articles from Frontiers Journals
[1] LIU Chun-Ming**, XIANG Xia, ZHANG Yan, JIANG Yong, ZU Xiao-Tao . Magnetism of a Nitrogen-Implanted TiO2 Single Crystal[J]. Chin. Phys. Lett., 2011, 28(12): 604-607
[2] QI Xin, ZHOU Xin, SHU Di, ZHAO Jing-Jing, WANG Wei, CHEN Juan** . Effect of Porous Structure on the Magnetic Properties of NixMgyZn1−x-yFe2O4 Magnetic Materials[J]. Chin. Phys. Lett., 2011, 28(10): 604-607
[3] FAN Ping, ZHENG Zhuang-Hao, LIANG Guang-Xing, CAI Xing-Min, ZHANG Dong-Ping. Composition-Dependent Characterization of Sb2Te3 Thin Films Prepared by Ion Beam Sputtering Deposition[J]. Chin. Phys. Lett., 2010, 27(8): 604-607
[4] CUI Xiao-Yan, HU Ting-Jing, HAN Yong-Hao, GAO Chun-Xiao, PENG Gang, LIU Cai-Long, WU Bao-Jia, WANG Yue, LIU Bao, REN Wan-Bin, LI Yan, SU Ning-Ning, ZOU Guang-Tian, DU Fei, CHEN Gang. Phase Transition Behavior of LiCr 0.35 Mn0.65O2 under High Pressure by Electrical Conductivity Measurement[J]. Chin. Phys. Lett., 2010, 27(3): 604-607
[5] ZHOU Xin, HOU Zhi-Ling, LI Feng, QI Xin** . Magnetic Properties of Ni-Zn Ferrite Prepared with the Layered Precursor Method[J]. Chin. Phys. Lett., 2010, 27(11): 604-607
[6] XIANG Jun, SHEN Xiang-Qian, SONG Fu-Zhan, MENG Xian-Feng. Fabrication and Characterization of Mn0.5Zn0.5Fe2O4 Magnetic Nanofibers[J]. Chin. Phys. Lett., 2010, 27(1): 604-607
[7] XUE Gang, PENG Long, ZHANG Huai-Wu. Crystal Structure and Magnetic Properties of Sm2Fe17Nδ Thin Films Deposited on Si (100) Substrates[J]. Chin. Phys. Lett., 2009, 26(9): 604-607
[8] SU Hua, ZHANG Huai-Wu, TANG Xiao-Li, JING Yu-Lan, ZHONG Zhi-Yong. Influences of Bi2O3/V2O5 Additives on the Microstructure and Magnetic Properties of Lithium Ferrite[J]. Chin. Phys. Lett., 2009, 26(5): 604-607
[9] SHE Sheng-Xian, WEI Dan, ZHENG Yang, QU Bing-Jun, REN Tian-Ling, LIU Xi, WEI Fu-Lin. Micromagnetic Simulation of Transfer Curve in Giant-Magnetoresistive Head[J]. Chin. Phys. Lett., 2009, 26(12): 604-607
[10] LI Chang-Hui, LIU Yi, WANG Fen, LUO Xuan, SUN Yu-Ping, ZHANG Xiang-Qun, CHENG Zhao-Hua, SUN Yang. Photoinduced Magnetization Change in Multiferroic YbFe2O4[J]. Chin. Phys. Lett., 2009, 26(12): 604-607
[11] LUO Wei, ZHU Lin-Li, ZHENG Xiao-Jing. Grain Size Effect on Electrical Conductivity and Giant Magnetoresistance of Bulk Magnetic Polycrystals[J]. Chin. Phys. Lett., 2009, 26(11): 604-607
[12] SUN Hui-Yuan, HU Yun-Zhi, LIU Li-Hu. Influence of Temperature on Equilibrium Separation Between Vertical Bloch Lines in OHBs in Garnet Bubble Films[J]. Chin. Phys. Lett., 2009, 26(1): 604-607
[13] ZHENG Hong, YANG Yong, WEN Fu-Sheng, YI Hai-Bo, ZHOU Dong, LI Fa-Shen. Microwave Magnetic Permeability of Fe3O4 Nanoparticles[J]. Chin. Phys. Lett., 2009, 26(1): 604-607
[14] ZHANG Tao, LU Hong-Liang, ZHANG Yi-Men, ZHANG Yu-Ming, YE Li-Hui. Sinusoidal Steady State Analysis on 4H--SiC Buried Channel MOSFETs[J]. Chin. Phys. Lett., 2008, 25(5): 604-607
[15] TU Tao, ZHAO Yong-Jie, HAO Xiao-Jie, WANG Cheng-You, GUO Guang-Can, GUO Guo-Ping. Localization Exponent for the Second Landau Level in the Quantum Hall Effect[J]. Chin. Phys. Lett., 2008, 25(3): 604-607
Viewed
Full text


Abstract