Metal–insulator transition under high pressure in

✍ Scribed by Hiroyuki Hidaka; Ikuma Ando; Hisashi Kotegawa; Tatsuo C. Kobayashi; Hisatomo Harima; Miki Kobayashi; Hitoshi Sugawara; Hideyuki Sato

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 171 KB
• Volume: 359-361
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2005.01.334

✦ Synopsis

We have studied the electrical resistivity in a skutterudite compound PrFe 4 P 12 under high pressure. An antiferroquadrupolar ordering temperature T Q decreases monotonously with increasing pressure up to 2.4 GPa. Above 2.4 GPa, the metal-insulator (M-I) transition appears. By applying magnetic field, this M-I transition is suppressed easily and heavy-fermion state is realized. The observed Kondo effect and the field-induced heavy-fermion state at high pressure suggest that the quadrupolar interactions of the f electrons of Pr 3þ survive even in the insulator phase.