Quantum phase transition in K3D1-xHx(SO4)2
Abstract
Dielectric and thermodynamic properties have been investigated in isotopically mixed crystals K3D1-xHx(SO4)2 with isolated hydrogen bonds interconnecting the dimeric SO2-4 units. The critical temperature Tc for the antiferroelectric phase transition decreases with increasing proton concentration (x) and eventually the phase transition vanishes for x>=xc~0.66. The x-dependent behavior of Tc, the dielectric constant ɛ(T), and the specific heat jump ΔC at Tc are described by simple transverse Ising Hamiltonian. This indicates a determinative role of the proton tunneling in the phase transition and related properties.
- Publication:
-
Physical Review Letters
- Pub Date:
- October 1993
- DOI:
- 10.1103/PhysRevLett.71.2833
- Bibcode:
- 1993PhRvL..71.2833M
- Keywords:
-
- 77.80.Bh;
- 64.60.Cn;
- 64.70.Kb;
- 77.90.+k;
- Phase transitions and Curie point;
- Order-disorder transformations;
- statistical mechanics of model systems;
- Solid-solid transitions;
- Other topics in dielectrics piezoelectrics and ferroelectrics and their properties