Felea V., Prodan L., Stefanet E., Cong P.T., Zherlitsyn S., Tsurkan V. «Ultrasound propagation in bond frustrated HgCr₂S₄ spinel in magnetic fields» Физика низких температур, 43, № 5, с. 702-706 (2017)

Ultrasound and magnetization studies of bond frustrated spinel HgCr₂S₄ are performed as a function of temperature in static magnetic fields. Beside the anharmonic effect, the sound velocity shows pronounced anomaly at the antiferromagnetic (AFM) transition at T_N=23 K with an additional significant increase of the order of 0.5% indicating a strong spin-lattice coupling. External magnetic fields enhance the ferromagnetic (FM) correlations and shift the anomalies to lower temperatures concomitantly with the reduction of the Neel temperature. The constructed H–T phase diagram beside the long-range AFM states reveals the state with induced FM order and regimes with short-range AFM and FM correlations as well.

Kuznetsova I.E., Anisimkin V.I., Kolesov V.V., Fionov A.S., Melikhov M.Z., Kashin V.V., Zaitsev B.D., Teplykh A.A. «The investigation of effect of thin films conductivity on the acoustic waves in structures containing piezoelectric plates» 24th International Crimean conference microwave and telecommunication technology, CriMiCo 2014 Sevastopol, Crimea, 07–13 Sept. 2014, с. 765-766 (2014)

Freiman Yu.A., Grechnev A., Tretyak S.M., Goncharov A.F., Hemley R.J. «Sound velocities in solid hydrogen under pressure» Физика низких температур, 39, № 5, с. 548-551 (2013)

We present results of semi-empirical lattice dynamics calculations of the sound velocities in solid hydrogen under pressure based on the many-body intermolecular potential and first-principle density-functional theory (DFT). Both the sound velocities and elastic moduli are in excellent agreement with data from Brillouin scattering measurements while Silvera–Goldman and Hemley–Silvera–Goldman potentials tend to overestimate the sound velocity. It is shown that the stiffer is the potential the greater is overestimated the sound velocity. As was the case for equation of state and Raman-active lattice phonon calculations, the employed many-body potential works well for phases I and II (up to ∼140 GPa while for higher pressures the use of the DFT is preferable.