Heavy holes localization, metal-insulator transition and superconductivity of HTSC oxides
- Russian Academy of Sciences, Moscow (Russian Federation). P.N. Lebedev Physical Inst.
- Moscow Steel and Alloys Inst. (Russian Federation)
On the basis of experimental studies of specific heat, magnetic properties and thermal expansion it was shown that dielectric-metal phase transition was the consequence of delocalization of heavy holes located on metal-apical oxygen bonds in the high-temperature superconducting (HTSC) oxide systems. The dielectric gaps in electronic spectrum of the oxide systems appear owing to the charge density waves (CDW) of the ordered arrays of such localized (heavy) holes. The CDW is the microscopic reason of the negative thermal expansion observed in dielectric phases of some HTSC systems. The free carriers introduced in the oxide systems by doping can couple through excitations of these localized holes (local bosons). Such free carriers pairing leads to the high-temperature superconductivity with small coherence length and anomalous (with positive curvature) temperature dependence of H{sub c2}(T). The suggested localized holes on the metal-apical oxygen bonds and local bosons in addition to the usual phonons are the basis for the explanation of the experimental data presented in this report.
- Sponsoring Organization:
- International Science Foundation
- OSTI ID:
- 548452
- Report Number(s):
- CONF-960163-; ISBN 0-8194-2071-9; TRN: 98:000268
- Resource Relation:
- Conference: Photonics West `96: conference on quantum well and superlattice physics VI, San Jose, CA (United States), 27 Jan - 2 Feb 1996; Other Information: PBD: 1996; Related Information: Is Part Of Oxide superconductor physics and nano-engineering II; Bozovic, I. [ed.] [Varian Research Center, Palo Alto, CA (United States)]; Pavuna, D. [ed.] [Swiss Federal Inst. of Tech., Lausanne (Switzerland)]; PB: 578 p.; Proceedings/SPIE, Volume 2697
- Country of Publication:
- United States
- Language:
- English
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