Metal-Insulator transitions: Influence of lattice structure, jahn-teller effect, and hund's rule coupling

J. E. Han; E. Koch; O. Gunnarsson

doi:10.1103/PhysRevLett.84.1276

Metal-Insulator transitions: Influence of lattice structure, jahn-teller effect, and hund's rule coupling

J. E. Han
, E. Koch
, O. Gunnarsson

Physics

Max Planck Institute for Solid State Research

Research output: Contribution to journal › Article › peer-review

62 Scopus citations

Abstract

We study the influence of the lattice structure, the Jahn-Teller effect, and the Hund’s rule coupling on a metal-insulator transition in A_nC₆₀(A = K, Rb). Thedifference in the lattice structure favors A₃C₆₀ (fcc) being a metal and A₄C₆₀ (bct) being an insulator, and the coupling to H_g Jahn-Teller phonons favors A₄C₆₀ being nonmagnetic. The coupling to H_g(A_g) phonons decreases (increases) the value U_c of the Coulomb integral at which the metal-insulator transition occurs. There is an important partial cancellation between the Jahn-Teller effect and the Hund’s rule coupling.

Original language	English
Pages (from-to)	1276-1279
Number of pages	4
Journal	Physical Review Letters
Volume	84
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevLett.84.1276
State	Published - 2000

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title = "Metal-Insulator transitions: Influence of lattice structure, jahn-teller effect, and hund's rule coupling",

abstract = "We study the influence of the lattice structure, the Jahn-Teller effect, and the Hund{\textquoteright}s rule coupling on a metal-insulator transition in AnC60(A = K, Rb). Thedifference in the lattice structure favors A3C60 (fcc) being a metal and A4C60 (bct) being an insulator, and the coupling to Hg Jahn-Teller phonons favors A4C60 being nonmagnetic. The coupling to Hg(Ag) phonons decreases (increases) the value Uc of the Coulomb integral at which the metal-insulator transition occurs. There is an important partial cancellation between the Jahn-Teller effect and the Hund{\textquoteright}s rule coupling.",

author = "Han, \{J. E.\} and E. Koch and O. Gunnarsson",

year = "2000",

doi = "10.1103/PhysRevLett.84.1276",

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T2 - Influence of lattice structure, jahn-teller effect, and hund's rule coupling

AU - Han, J. E.

AU - Koch, E.

AU - Gunnarsson, O.

PY - 2000

Y1 - 2000

N2 - We study the influence of the lattice structure, the Jahn-Teller effect, and the Hund’s rule coupling on a metal-insulator transition in AnC60(A = K, Rb). Thedifference in the lattice structure favors A3C60 (fcc) being a metal and A4C60 (bct) being an insulator, and the coupling to Hg Jahn-Teller phonons favors A4C60 being nonmagnetic. The coupling to Hg(Ag) phonons decreases (increases) the value Uc of the Coulomb integral at which the metal-insulator transition occurs. There is an important partial cancellation between the Jahn-Teller effect and the Hund’s rule coupling.

AB - We study the influence of the lattice structure, the Jahn-Teller effect, and the Hund’s rule coupling on a metal-insulator transition in AnC60(A = K, Rb). Thedifference in the lattice structure favors A3C60 (fcc) being a metal and A4C60 (bct) being an insulator, and the coupling to Hg Jahn-Teller phonons favors A4C60 being nonmagnetic. The coupling to Hg(Ag) phonons decreases (increases) the value Uc of the Coulomb integral at which the metal-insulator transition occurs. There is an important partial cancellation between the Jahn-Teller effect and the Hund’s rule coupling.

UR - https://www.scopus.com/pages/publications/0001681182

U2 - 10.1103/PhysRevLett.84.1276

DO - 10.1103/PhysRevLett.84.1276

M3 - Article

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VL - 84

SP - 1276

EP - 1279

JO - Physical Review Letters

JF - Physical Review Letters

IS - 6

ER -

Metal-Insulator transitions: Influence of lattice structure, jahn-teller effect, and hund's rule coupling

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