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首页> 外文期刊>Physica status solidi, B. Basic research >Correlation between the magnetic phase transition and the electric properties in substituted spinels Zn1-xCuxCr2Se4
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Correlation between the magnetic phase transition and the electric properties in substituted spinels Zn1-xCuxCr2Se4

机译：取代尖晶石Zn1-xCuxCr2Se4的磁性相变与电性能的相关性

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摘要

The electric proper-ties of normal-type spinels Zn1-xCuxCr2Se4 have been studied by measuring the electric resistivity from 5 K to 300 K. It is found that the substituted compounds with x = 0.02 and 0.15 are semiconductors down to 5 K, while ones with x greater than or equal to 0.30 are metals with high conductivity. However, it is also found that the metallic properties of the latter are characterized by new electric modulations in a low-temperature region. Zn1-xCuxCr2Se4 with x = 0.3 and 0.5 show the electric phase transition from semiconductor to metal at about 60 K and 25 K, respectively. The metallic compounds with x = 0.75 and 1.0 show the kink of the resistivity at about 60 K with increasing temperature. The highly conductive Zn0.4Cu6Cr2Se4 slightly shows the weak semiconducting behavior in the region from 5 K to 280 K. It is considered for the substituted system Zn1-xCuxCr2Se4 with x < 0.75 that, only in the semiconducting phase (0.0 < x < 0.75) and the insulating phase (x = 0.0), there are partially localized Cr3+ spins showing the superexchange interaction between the Cr3+ and Cr3+ spins in the antiferromagnetic phase below about 22 K to 28 K. The antiferromagnetic to ferromagnetic phase transitions occur-ring at 24 K to 28 K in Zn1-xCuxCr2Se4 with 0.15 less than or equal to x < 0.75 are induced by the disappearance of the superexchange interaction between localized Cr3+ and Cr3+ spins, and by the predominance of the double-exchange interaction between Cr3+ spin and conductive Cr4+ spin polaron in the Se2- valence band.
机译：通过测量从5 K到300 K的电阻率，研究了普通型尖晶石Zn1-xCuxCr2Se4的电性能。发现x = 0.02和0.15的取代化合物是低至5 K的半导体。 x大于或等于0.30的是高导电率的金属。但是，还发现后者的金属特性的特征在于在低温区域中的新的电调制。 x = 0.3和0.5的Zn1-xCuxCr2Se4分别在约60 K和25 K处显示出从半导体到金属的电相转变。 x = 0.75和1.0的金属化合物随着温度升高，在约60 K时显示出电阻率扭结。高导电性的Zn0.4Cu6Cr2Se4在5 K至280 K的区域中略微显示出弱的半导体行为。对于x <0.75的取代系统Zn1-xCuxCr2Se4认为，仅在半导体相中（0.0

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