Shift of close-packed basal planes as an order parameter of transitions between antiferromangetic phases in solid oxygen: II. Temperature/pressure dependence of sound velocities and lattice parameters
| dc.creator | Gomonay, H. V. | |
| dc.creator | Loktev, V. M. | |
| dc.date | 2007-03-13 | |
| dc.date.accessioned | 2026-07-07T07:51:37Z | |
| dc.date.available | 2026-07-07T07:51:37Z | |
| dc.description | In the present paper we generalised a phenomenological model developed in \cite{gomo:2005} for the description of magnetostructural phase transitions and related peculiarities of elastic properties in solid oxygen under high pressure and/or low (below 40 K) temperature. We show that variation of all the lattice parameters in the vicinity of $αβ$-phase transition is due to both the shift of basal closed packed planes and appearance of the long-range magnetic order. Competition between these two factors from one side and lattice compression below $T_{αβ}$ from another produces non monotonic temperature dependence of lattice parameter $b$ (along monoclinic axis). Steep decrease of the sound velocities in the vicinity of $T_{αβ}$ can be explained by the softening of the lattice with respect to shift of the close-packed planes (described by the constant $K_2$) prior to phase transition point. We anticipate an analogous softening of sound velocities in the vicinity of $αδ$-phase transition and non monotonic pressure dependence of sound velocities in $α$-phase. | |
| dc.description | 11 pages, 8 figures, to appear in Low Temperature Physics, v.33, N6, 2007, materails presented at the Conference CC-2006, Kharkov, 2006 | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0703350 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0703350 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/125582 | |
| dc.subject | Materials Science | |
| dc.subject | Statistical Mechanics | |
| dc.title | Shift of close-packed basal planes as an order parameter of transitions between antiferromangetic phases in solid oxygen: II. Temperature/pressure dependence of sound velocities and lattice parameters | |
| dc.type | text |