@article{oai:muroran-it.repo.nii.ac.jp:00005966,
 author = {ENDO, Ryo and MATSUMOTO, Nobuhiro and CHIKAZAWA,  Susumu and 近澤, 進 and Nagata,  Shoichi and 永田, 正一 and FURUBAYASHI, Takao and MATSUMOTO, Takehiko},
 issue = {7},
 journal = {Physical review. Third series. B, Condensed matter and materials physics},
 month = {Aug},
 note = {application/pdf, The normal thiospinel CuIr2S4 exhibits a temperature-induced metal-insulator (M-I) transition around 230 K with structural transformation, showing hysteresis on heating and cooling. The symmetry changes from a high-temperature cubic phase in a metallic state to low-temperature tetragonal phase in an insulating state. A significant characteristic feature is the absence of localized magnetic moment below TM-I. On the other hand, NiIr2S4 remains metallic down to 4.2 K without the structural transformation. We have systematically studied the structural transformation and electrical and magnetic properties of Cu1-xNixIr2S4. The variation of the metal-insulator transition with Ni concentration x is presented. A phase diagram between TM-I and x will be provided for the Cu1-xNixIr2S4 system. The TM-I varies drastically from 226 to 88 K with x from 0.00 to 0.13 and disappears around x=0.15. For 0.08&les;x&les;0.13, the cubic and tetragonal phases coexist below TM-I. For a high-temperature metallic phase, the value of the Pauli paramagnetic susceptibility increases monotonically with x, which shows dD(&epsiv;)/d&epsiv;<0 at the Fermi energy &epsiv;F, through the decrease of the free-electron number density, where D(&epsiv;) is the electronic density-of-state on the basis of a nearly free-electron model. By the introduction of a Ni ion to the A-site of CuIr2S4 in the spinel structure, whether the localized magnetic moment below TM-I arises or not will be discussed},
 pages = {075106-1--075106-7},
 title = {Metal-insulator transition in the spinel-type Cu1-xNixIr2S4 system},
 volume = {64},
 year = {2001},
 yomi = {チカザワ, ススム and ナガタ, ショウイチ}
}