Resonating-valence-bond theory of phase transitions and superconductivity in La2CuO4-based compounds
Abstract
We identify the mysterious high-T ``twitch'' transition in La2CuO4 with the mean-field resonating-valence-bond transition of the Heisenberg model of Baskaran, Zou, and Anderson. The structure distortions are caused by Coulomb correlations of the pair wave function. In the pure compound the pseudo-Fermi surface of the spin soliton nests and antiferromagnetism occurs at 240 K. We discuss briefly superconductivity and the nature of excitations in the system.
- Publication:
-
Physical Review Letters
- Pub Date:
- June 1987
- DOI:
- 10.1103/PhysRevLett.58.2790
- Bibcode:
- 1987PhRvL..58.2790A
- Keywords:
-
- Heisenberg Theory;
- Lanthanum Oxides;
- Mixed Oxides;
- Phase Transformations;
- Superconductivity;
- Valence;
- Copper Oxides;
- Doped Crystals;
- Kinetic Energy;
- Wave Functions;
- Solid-State Physics;
- 74.20.-z;
- 68.65.+g;
- 75.10.Jm;
- Theories and models of superconducting state;
- Quantized spin models