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We study magnetoelastic properties of a spin-1/2 Ising-Heisenberg diamondchain, whose elementary unit cell consists of two decorating Heisenberg spinsand one nodal Ising spin. It is assumed that each couple of the decoratingatoms including the Heisenberg spins harmonically vibrates perpendicularly tothe chain axis, while the nodal atoms involving the Ising spins are placed atrigid positions when ignoring their lattice vibrations. An effect of themagnetoelastic coupling on a ground state and finite-temperature properties isparticularly investigated close to a triple coexistence point depending on aspring-stiffness constant ascribed to the Heisenberg interaction. Themagnetoelastic nature of the Heisenberg dimers is reflected through a non-nullplateau of the entropy emergent in a low-temperature region, whereas thespecific heat displays an anomalous peak slightly below the temperature regioncorresponding to the entropy plateau. The magnetization also exhibits a plateauin the same temperature region at almost saturated value before it graduallytends to zero upon increasing of temperature. The magnetic susceptibilitydisplays within the plateau region an inverse temperature dependence, whichslightly drops above this plateau, whereas an inverse temperature dependence isrepeatedly recovered at high enough temperatures.

Magnetoelastic properties of a spin-1/2 Ising-Heisenberg diamond chain in vicinity of a triple coexistence point