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

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.Comment: 5 pages, 1 figur

SPECIFIC HEAT OF EuS/SrS MULTILAYERS-DEPENDENCE ON MAGNETIC FIELD AND LAYER THICKNESS RATIO

The low-temperature specific heat C of a EuS/SrS multilayer with layer thickness dM = dN = 1.25 nm (M = EuS, N = SrS) is identical to that of bulk EuxSrl-xS with x = 0.54 in magnetic fields up to 3 T, due to the formation of EuxSrl-xS by diffusion. For multilayers with increasing dM/dN, C, evolves towards pure EuS, thus exhibiting a transition from spin-glass to ferromagnet