{"title":"Metal–insulator transition in the spinel-type Cu(Ir1−xPtx)2S4 system","authors":"Nobuhiro Matsumoto, Yasuhiro Yamauchi, Junji Awaka, Yasushi Kamei, Hideaki Takano, Shoichi Nagata","doi":"10.1016/S1466-6049(01)00180-5","DOIUrl":null,"url":null,"abstract":"<div><p>A normal thiospinel CuIr<sub>2</sub>S<sub>4</sub> exhibits a temperature-induced metal–insulator (M–I) transition around 226 K with crystal structure transformation. In order to study gradual variations of the M–I transition by gentle chemical modification with increasing the number of 5d electron, we have prepared the polycrystalline samples of Cu(Ir<sub>1−<em>x</em></sub>Pt<sub><em>x</em></sub>)<sub>2</sub>S<sub>4</sub> and have investigated the electrical and magnetic properties of these samples. The features of the M–I transition in the electrical resistivity vary gradually with Pt concentration <em>x</em>. No structural transformation has been observed for <em>x</em><span>=0.25 and 0.30, where the abrupt jump disappears in the resistivity and the magnetic susceptibility around the transition temperature.</span></p></div>","PeriodicalId":100700,"journal":{"name":"International Journal of Inorganic Materials","volume":"3 7","pages":"Pages 791-795"},"PeriodicalIF":0.0000,"publicationDate":"2001-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1466-6049(01)00180-5","citationCount":"8","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Inorganic Materials","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1466604901001805","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 8
Abstract
A normal thiospinel CuIr2S4 exhibits a temperature-induced metal–insulator (M–I) transition around 226 K with crystal structure transformation. In order to study gradual variations of the M–I transition by gentle chemical modification with increasing the number of 5d electron, we have prepared the polycrystalline samples of Cu(Ir1−xPtx)2S4 and have investigated the electrical and magnetic properties of these samples. The features of the M–I transition in the electrical resistivity vary gradually with Pt concentration x. No structural transformation has been observed for x=0.25 and 0.30, where the abrupt jump disappears in the resistivity and the magnetic susceptibility around the transition temperature.