講演題目: Impurity Band Mott Insulators
- a new route to (High Tc) Superconductivity
講 師 : G. Baskaran
(教授、Institute of Mathematical Sciences, Chennai、インド
および 東北大学金属材料研究所付属
材料科学国際フロンティアセンター・客員教授)
日 時 : 平成16年5月27日(木) 16:00-
場 所 : 北海道大学大学院理学研究科物理学専攻 大学院講義室
理学部 2号館(2−11号室)
要 旨 :
Mott insulators have given us a nice route to reach a correlation driven high Tc superconductivity and novel superconductors as evidenced by cuprate and organic superconductors. Inspired by a recent finding [1] of superconductivity in boron doped dimaond. I suggest that impurity band Mott insulators provide another route for high Tc superconductivity. I will illustrate this idea by going into some details of an electron correlation driven superconductivity mechanism I have suggested for the heavily doped diamond [2]. I argue that the uncompensated boron impurity band is strongly correlated and undergoes a Anderson-Mott insulator to superconductivity transition as the boron density is increased across a critical concentration.
[1] E.A. Ekimov et al., Nature (London), 428 542 (2004)
[2] G. Baskaran, cond-mat/0404286
世話人 熊谷健一 (北海道大学大学院理学研究科)
(Tel: 011-706-4422、kumagai@phys.sci.hokudai.ac.jp)
|