Consideration of Exciton Models to Explain Superconductivity Transition above 150 K in HgBaFormulaCaFormulaCuFormulaOFormula at Ultra-High Pressure

G. C. Vezzoli
1994 Proceedings of the Royal Society A  
It has been recently reported that the shoulder of the superconducting transition in HgBa2Ca2Cu3 0 8+(5 can be elevated from ca. 133 K to ca. 153 K as pressure is raised from 1 atm (ca. 105 Pa) to 150 kbar (1.5 x 1010 Pa). The data show an approximately linear Tc against P up to ca. 17 kbar (1.7 x 109 Pa) (hydrostatic), and thereafter (non-hydrostatic) indication of saturation or slope change. It is the purpose of this paper to discuss this pressure enhancement in terms of two general theories
more » ... o general theories of exciton-induced high-Tc superconductivity, namely the viewpoint of the virtual exciton and that of the condensation of excitons. f Hole localization has been described by many researchers to be associated with the origin of high-Tc superconductivity. A recent citation that alludes to the subject is Hirsch (1991; also C. W. Chu, personal com m unication). Allender et aZ.'s pioneering and classical paper was published over a decade before the discovery of high-Tc superconducting ceramic oxides. Proc. R. Soc. bond. A (1994) 446, 213-216 P rinted in Great B ritain
doi:10.1098/rspa.1994.0100 fatcat:n7gdjec47vejlb2eosrfc5kgs4