Magnetic polaron conductivity in FeCr2S4 with the colossal magnetoresistance effect
Magnetic polaron conductivity in FeCr2S4 with the colossal magnetoresistance effect
复制标题
DOI：
10.1103/physrevb.62.13872
复制
发表时间：
2000-12
影响因子：
3.7
通讯作者：
Zhaorong Yang;S. Tan;Z. Chen;Yuheng Zhang
中科院分区：
文献类型：
--
作者：
Zhaorong Yang;S. Tan;Z. Chen;Yuheng Zhang
研究了巨磁阻材料FeCr2S4的磁电输运特性。低温热电势和电阻率测量表明，磁极化子在高于 T-c（起始）的温度下主导传导行为。在 4.2 至 400 K 范围内测量的磁化率 chi 的温度依赖性表明 FeCr2S4 具有亚铁磁性。然后通过100至290 K的电子自旋共振测量进一步研究了FeCr2S4的微观磁性，结果表明在低于T-c(onset)的一定温度范围内，顺磁-铁磁转变是不完全的，并且顺磁相与亚铁磁相共存。伴随着顺磁-亚铁磁相变，磁极化子可能逐渐离域到裸载流子中。所提出的温度范围内的电阻率可以用关于磁极化子和裸载流子共存的双流体模型来描述。
The magnetic and electrical transport properties of the colossal magnetoresistance material FeCr2S4 are studied. Low-temperature thermoelectric power and resistivity measurements indicate that magnetic polarons dominate the conduction behavior at temperatures above T-c(onset). The temperature dependence of the susceptibility chi, measured from 4.2 to 400 K, suggests that FeCr2S4 is ferrimagnetic. Then the micromagnetism of FeCr2S4 is further investigated by electron-spin-resonance measurements from 100 to 290 K, which reveal that the paramagnetic-ferromagnetic transition is incomplete and that a paramagnetic phase coexists with a ferrimagnetic phase in a certain temperature range below T-c(onset). Accompanying the paramagnetic-ferrimagnetic phase transition, magnetic polarons may delocalize gradually into the naked carriers. The resistivity in the presented temperature range can be described in terms of the two-fluid model concerning the coexistence of magnetic polarons and naked carriers.