1998 年 67 巻 1 号 p. 45-48
Small Drude weight D together with small specific heat coefficient γ observed in the ferromagnetic phase of R1-xAxMnO3 (R=La, Pr, Nd, Sm; A=Ca, Sr, Ba) are analyzed in terms of a proximity effect of the Mott insulator. The scaling theory for the metal-insulator transition with the critical enhancement of orbital correlations toward the staggered ordering of two eg orbitals such as 3x2-r2 and 3y2-r2 symmetries may lead to the critical exponents of D ∝ δu and γ ∝ δv with u=3/2 and v=0. The result agrees with the experimental indications.
この記事は最新の被引用情報を取得できません。