Pressure-induced magnetoresistivity reversal in magnetite

Pressure-induced magnetoresistivity reversal in magnetite
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磁铁矿中压力引起的磁阻反转

DOI:
10.1063/1.3663217
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发表时间:
2011-11
影响因子:
4
通讯作者:
Chunxiao Gao
Chunxiao Gao
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Ningning Su;Yonghao Han;Yanzhang Ma;Hongwu Liu;Boheng Ma;Chunxiao Gao

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在压力高达19.0 GPa和磁场高达15 kG的条件下,测量了纳米粉末磁铁矿的磁电阻率(MR)。在6.0GPa以下出现了非预期的准线性正磁电阻,在6.0GPa附近出现了磁电阻由正向负的转变,这是由于Mo与Fe_3O_4样品接触表面的纳米尺度非均匀性和磁铁矿的高负自旋极化引起的限制效应。在约6.0 GPa的MR转变来自于由压力引起的从半金属到金属的相变。
The magnetoresistivity (MR) of nano-powdered magnetite has been measured under pressures up to 19.0 GPa and magnetic fields up to 15 kG. An unexpected quasi-linear positive MR below 6.0 GPa and an MR transition from positive to negative around 6.0 GPa have been found. The abnormal positive MR below 6.0 GPa originates from the confinement effect caused by nano-scale heterogeneity at the contact surface between Mo and Fe3O4 sample and the high negative spin polarization of magnetite. The MR transition at about 6.0 GPa comes from a phase transition from half-metal to metal induced by pressure.
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