Quantum Oscillations of Elastic Moduli and Softening of Phonon Modes in Metals

Details Quantum Oscillations of Elastic Moduli and Softening of Phonon Modes in Metals Quantum Oscillations of Elastic Moduli and Softening of Phonon Modes in Metals

2004-02-27

arxiv.org/abs/cond-mat/0402686v2

Phys. Rev. B 71, 024109 (2005)

Physics

Condensed Matter

Materials Science

5 pages, 1 figure

Scientific paper

10.1103/PhysRevB.71.024109

In this paper we present a theoretical analysis of the effect of magnetostriction on quantum oscillations of elastic constants in metals under strong magnetic fields. It is shown that at low temperatures a significant softening of some acoustic modes could occur near peaks of quantum oscillations of the electron density of states (DOS) at the Fermi surface (FS). This effect is caused by a magnetic instability of a special kind, and it can give rise to a lattice instability. We also show that the most favorable conditions for this instability to be revealed occur in metals whose Fermi surfaces include nearly cylindrical segments.

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