HIGH-PRESSURE LOW-TEMPERATURE PHASE TRANSITION IN A DOPED PARA-TERPHENYL CRYSTAL : A SPECTRAL-HOLE-BURNING STUDY
作者： Jaak Kikas , Arlentin Laisaar , Artur Suisalu , Anatoli Kuznetsov , Aleksandr Ellervee
关键词: Condensed matter physics 、 Hydrostatic equilibrium 、 Phase transition 、 Doping 、 Spectral hole burning 、 Terphenyl 、 Thermal 、 Activation energy 、 Materials science 、 Crystal
摘要: The homogeneous width of zero-phonon lines in a chlorin-doped para-terphenyl crystal is determined by spectral hole burning at $T=4.2--14\mathrm{K}$ under various hydrostatic pressures up to 7 kbar. A drastic broadening holes with pressure occurs on approaching the order-disorder (triclinic-to-monoclinic) phase transition which takes place $P\ensuremath{\approx}5.5\mathrm{kbar}$ $4.2l~Tl~14\mathrm{K}.$ thermal fixed an activated process activation energy depending and having deep minimum $P\ensuremath{\approx}5.5\mathrm{kbar},$ i.e., phase-transition region.
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