Lattice instability and high-Tc superconductivity in La2-xBaxCuO4
Abstract
La1.85Ba0.15CuO4 exhibits high-Tc superconductivity with an onset temperature near 33 K as measured by resistivity and magnetic susceptibility. The nonsuperconducting end-member compound, La2CuO4, which has an orthorhombic, Cmca structure, exhibits semiconducting behavior. The orthorhombic distortion is proposed to result from a Peierls 2kF instability or a soft zone-boundary phonon mode. The role of Ba is to suppress the instability and stabilize a higher-symmetry tetragonal, I4/mmm structure which is metallic and superconducting.
- Publication:
-
Physical Review Letters
- Pub Date:
- March 1987
- DOI:
- Bibcode:
- 1987PhRvL..58.1024J
- Keywords:
-
- Crystal Structure;
- High Temperature Superconductors;
- Lanthanum Compounds;
- Lattice Parameters;
- Magnetic Permeability;
- Stability;
- Superconductivity;
- Barium Compounds;
- Brillouin Zones;
- Copper Oxides;
- Electrical Resistivity;
- Stoichiometry;
- Temperature Dependence;
- Solid-State Physics;
- 74.10.+v;
- 71.25.Pi;
- 72.15.Nj;
- 74.70.Ya;
- Occurrence potential candidates;
- Collective modes