Commensurate and modulated magnetic phases in orthorhombic A1C60

Details Commensurate and modulated magnetic phases in orthorhombic A1C60 Commensurate and modulated magnetic phases in orthorhombic A1C60

1994-12-02

arxiv.org/abs/mtrl-th/9412002v1

Physics

Condensed Matter

Materials Science

11 pages REVTeX 3.0 plus 4 figures appended

Scientific paper

10.1103/PhysRevB.52.12493

Competing magnetically ordered structures in polymerized orthorhombic A1C60 are studied. A mean-field theory for the equilibrium phases is developed using an Ising model and a classical Heisenberg model to describe the competition between inter- and intra-chain magnetic order in the solid. In the Ising model, the limiting commensurate one-dimensional and three-dimensional phases are separated by a commensurate three-sublattice state and by two sectors containing higher-order commensurate phases. For the Heisenberg model the quasi-1D phase is never the equilibrium state; instead the 3D commensurate phases exhibits a transition to a continuum of coplanar spiral magnetic phases.

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