X-ray-induced electrical conduction in the insulating phase of thiospinel CuIr2S4

✍ Scribed by Takao Furubayashi; Hiroyuki Suzuki; Takehiko Matsumoto; Shoichi Nagata

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 172 KB
• Volume: 126
• Category: Article
• ISSN: 0038-1098
• DOI: 10.1016/s0038-1098(03)00298-9

✦ Synopsis

Effects of X-ray irradiation on the crystal structure and the electrical resistance were examined at low temperatures for the insulating phase of spinel compound CuIr 2 S 4 . We found that the resistance decreases by more than five decades by irradiation at 8.5 K. The structural change from triclinic to tetragonal was observed at the same time. The X-ray-induced conductance is deduced to result from the destruction of Ir 4þ dimers formed in the insulating phase. Slow relaxation of the resistance in the Xray-induced state is also reported.