Pressure and alloying effects on the metal to insulator transition in NiS2-xSex studied by infrared spectroscopy
Pressure and alloying effects on the metal to insulator transition in NiS2-xSex studied by infrared spectroscopy
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DOI：
10.1103/physrevb.80.073101
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发表时间：
2009-08-01
影响因子：
3.7
通讯作者：
Lupi, S.
中科院分区：
文献类型：
--
作者：
Perucchi, A.;Marini, C.;Lupi, S.
通过红外反射率研究了电荷转移NiS_（2-x）Sex化合物的金属-绝缘体转变。通过对纯NiS 2（晶格收缩）和Se合金化（晶格膨胀）施加压力进行的测量表明，在这两种情况下都获得了异常的金属状态。我们发现，光学结果是不兼容的线性硒合金与压力标度关系先前建立通过运输，从而指出了两个过渡的实质上不同的微观起源。
The metal to insulator transition in the charge-transfer NiS2-xSex compound has been investigated through infrared reflectivity. Measurements performed by applying pressure to pure NiS2 (lattice contraction) and by Se alloying (lattice expansion) reveal that in both cases an anomalous metallic state is obtained. We find that optical results are not compatible with the linear Se-alloying vs pressure-scaling relation previously established through transport, thus pointing out the substantially different microscopic origin of the two transitions.