NDLI: Entropy-Driven Reentrant Phase Transitions in Even-J/Odd-J Mixtures of Linear Rotors

Content Provider	Springer Nature Link
Author	Freiman, Yu. A. Tretyak, S. M. Mao, H. K. Hemley, R. J.
Copyright Year	2005
Abstract	Depending on the parity of the rotational quantum number J, solid hydrogens exhibit either pressure-driven broken symmetry phase (BSP) transitions (even-J species – para-hydrogen (p-H$_{2}$), and ortho-deuterium (o-D$_{2}$)) or usual order-disorder phase transitions (odd-J species – o-H$_{2}$ and p-D$_{2}$) with the phase transition temperature increasing monotonically with pressure from the phase transition point at zero pressure. At the same time, for solid HD the BSP phase transition line displays a minimum, indicating that the disordered phase is reentrant. In this work a model of quantum linear rotors is used to study characteristic features of the P–T phase diagrams for ortho–para mixtures in solid H$_{2}$ and D$_{2}$. We developed a mean-field theory of even-J – odd-J mixtures of quantum linear rotors on a 3D lattice. Two limiting cases are considered: mixtures at thermodynamic equilibrium, where the conversion time is small or comparable with the thermalization time, and the opposite case, frozen mixtures, when the conversion time is large compared with other relevant times. We found that for all equilibrium linear rotor systems — the even-J – odd-J mixtures — the reentrant behavior of the phase transition lines is an entropy-driven phenomenon, as was previously found for the all-J system. Experimentally, conditions to find the reentrant BSP transition line are most favorable for H$_{2}$ mixtures, whereas the frozen monotonic phase lines should be the case for D$_{2}$ even-J – odd-J mixtures. These results may therefore be particularly useful for understanding the anomalous transition region of the BSP transition documented for D$_{2}$ mixtures.
Starting Page	765
Ending Page	772
Page Count	8
File Format	PDF
ISSN	00222291
Journal	Journal of Low Temperature Physics
Volume Number	139
Issue Number	5-6
e-ISSN	15737357
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2005-06-06
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Characterization and Evaluation Materials Condensed Matter Magnetism, Magnetic Materials
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Materials Science

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