ORIENTATIONAL QUADRUPOLAR GLASS IN ORTHO-PARA HYDROGEN MIXTURES .1. MEAN-FIELD MICROSCOPIC THEORY

Authors
Citation
Vb. Kokshenev, ORIENTATIONAL QUADRUPOLAR GLASS IN ORTHO-PARA HYDROGEN MIXTURES .1. MEAN-FIELD MICROSCOPIC THEORY, Journal of low temperature physics, 104(1-2), 1996, pp. 1-23
Citations number
48
Categorie Soggetti
Physics, Applied
ISSN journal
00222291
Volume
104
Issue
1-2
Year of publication
1996
Pages
1 - 23
Database
ISI
SICI code
0022-2291(1996)104:1-2<1:OQGIOH>2.0.ZU;2-0
Abstract
The mean-field theory of the quadrupolar glass (QG) is presented using microscopic approach. It is shown that the reaction-polarization effe cts caused by short-range spatial correlations are well distinguished from those of random-bond spin glasses. They control the QG concentrat ion threshold and result in an incomplete orientational order. The QG ground state (zero quadrupolization, unsaturated Edwards-Anderson-type orientational order parameter) is predicted Thermodynamic characteris tics, namely entropy, pressure and free energy as well as the related heat capacity and Gruneisen parameter ale estimated The ground-state f indings (incomplete order, residual entropy) are similar to those of s hort-range Potts glasses. A correspondence between density matrix and mean field treatment to the QG problem is also discussed.