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The Main Results of "bcc-hcp Group"
Liquid-like inclusions were found in quenched 3He-4He dilute mixture by NMR technique. [Ye.O. Vekhov, A.P. Birchenko, N.P. Mikhin, and E.Ya. Rudavskii. Fast Diffusion Process in Quenched hcp Dilute Solid 3He-4He Mixture // JLTP, 158, 496 (2010)]
The hysteresis of bcc-hcp transition in 3He-4He dilute mixture was observed. [A.P. Birchenko, Ye.O. Vekhov, N.P. Mikhin, and K.A. Chishko. Hysteresis of bcc-hcp Transition in Dilute Mixture 3Не in 4Не // Low Temp. Phys., 35, 914 (2009)]
The line of maximum attainable supercooling of bcc 4He was found. The data obtained were well described within the homogeneous nucleation theory. [V.N. Grigor’ev, N.P. Mikhin, E.Ya. Rudavskii, Ye.O. Vekhov. The bcc-hcp Phase Transition in 4He: Comparison with the Theory of Homogeneous Nucleation // JLTP, 150, 47 (2008)]
Universal molar volume dependencies for Debye temperature and activation energy of wide-band vacancy quasiparticles were obtained in bcc and hcp 3He and hcp 4He. [V.N. Grigor’ev, Ye.O. Vekhov. The Universality of Energy Spectrum of Phonon and Vacancy Excitations in Solid Helium // JLTP, 149, 51 (2007)]
The anomalous pressure relaxation under constant volume condition was observed by precise pressure measurement technique for non-annealed 4He crystals. This effect is described as non-ordered phase observation on the bcc-hcp interphase in as-grown (non-annealed) helium crystals. [N. Mikhin, A. Polev, E. Rudavskii, Ye. Vekhov. Effect of Crystal Quality on HCP-BCC Phase Transition in Solid 4He // JLTP 148, 707 (2007)]
The kinetic asymmetry of bcc-hcp phase transition was observed in solid 4He: the bcc phase is supercooled, the hcp phase is not superheated. [A. P. Birchenko, Ye. O. Vekhov, N. P. Mikhin, A. V. Polev, and E. Ya. Rudavskii. Kinetics of the bcc–hcp transition in 4He off the melting curve // LTP, 32, 1118 (2006); Fiz. Nizk. Temp., 32, 1471 (2006)]
Microscopic regions (about 20 mkm) with anomalous high diffusion coefficient closed to that in liquid were found by NMR technique in solid mixture of 1% 3He in 4He. These regions are only under bcc and hcp phases coexistence conditions and disappear in homophase sample. [N. P. Mikhin, A. V. Polev, and E. Ya. Rudavskii. Observation of Anomalously Fast Diffusion in 3He–4He Solid Solutions near the BCC–HCP Transition // JETP Letters, 73, 470 (2001); A. Polev, N. Mikhin, and E. Rudavskii. Spin Diffusion Processes in Solid 3He-4He Mixtures near the BCC-HCP Phase Transition at the Melting Curve // JLTP, 127, 279, (2002)]
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