| Original Articles |
|
|
|
|
Substantial Enhancements of Low-Field Magnetoresistance at Temperatures near 77 K with Doping 4% Cu at Mn Sites of La2/3Ca1/3MnO3 Synthesized at 1000°C |
| YUAN Song-Liu;ZHANG Guo-Hong;LIU Li;TANG Jie;ZHANG Li-Jiang;ZHONG Qiang-Hua;YANG Ying-Ping;FENG Wen;LIU Sheng;CHEN Wei;XIA Zheng-Cai |
| Department of Physics, Huazhong University of Science and Technology, Wuhan 430074 |
|
| Cite this article: |
|
YUAN Song-Liu, ZHANG Guo-Hong, LIU Li et al 2002 Chin. Phys. Lett. 19 1866-1869 |
|
|
|
|
Abstract We report on investigations of magnetoresistance (MR) in polycrystalline La2/3Ca1/3Mn1-xCuxO3 (x = 0 and 4%) samples prepared by the sol-gel method followed a sintering treatment at 1000°C. For the x = 4% sample, the most remarkable MR effect appears at temperatures near 77 K and for magnetic fields lower than 1 T. For fields ～ 0.3 T and at temperatures ～ 77 K, the x = 4% sample exhibits giant MR effect with M0 (≡ Δρ/ρ (H = 0)) between ～ 50 and ～ 70%, comparable to the so-called colossal MR response observed in the x = 0 sample for the 3 T field.
|
| Keywords:
75.30.Vn
72.25.-b
71.30.+h
|
|
|
Published: 01 December 2002
|
|
| PACS: |
75.30.Vn
|
|
| |
72.25.-b
|
(Spin polarized transport)
|
| |
71.30.+h
|
(Metal-insulator transitions and other electronic transitions)
|
|
|
|
|
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
