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On a Field-Induced Spin-Density Wave in Bechgaard Salts

100%

Apostol M.

Acta Physica Polonica A

1994

vol. 85

issue 6

971-978

A new type of field-induced spin-density wave is shown to occur in a weak-coupling layered model which may be relevant for the highly anisotropic electronic structure of the Bechgaard salts. The modulation vector of this instability is perpendicular to the layers and close to the direction of the magnetic field applied perpendicular to the reciprocal layers. The magnitude of the modulation vector, order parameter and critical temperature have an oscillatory dependence on the magnitude of the magnetic field.

Deformation of a Spherical Molecule

100%

Apostol M.

The deformation suffered by a hollow, spherical molecule as an effect of rotations is studied within a continuum model which might be relevant for the fullerene molecule. The spherical elasticity is established to the lowest order in deformations and the natural perturbation parameter required by the stability of the object is identified as the square ratio of the rotation to the radial vibration pulsations. It is also shown that the main effect of the centrifugal coupling between rotations and radial vibrations is a static deformation whose energy is beyond the harmonic approximation.

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2 Acta Physica Polonica A

1 1995

1 1994

2 Apostol M.

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On a Field-Induced Spin-Density Wave in Bechgaard Salts

Deformation of a Spherical Molecule