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Relationship between and implications of the isotope and pressure effects on transition temperature, penetration depths and conductivities
Author(s) -
Schneider T.
Publication year - 2005
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200404955
Subject(s) - condensed matter physics , scaling , superconductivity , anisotropy , hydrostatic pressure , crossover , penetration depth , physics , transition temperature , cuprate , thermodynamics , quantum mechanics , mathematics , geometry , artificial intelligence , computer science
It is shown that the empirical relations between transition temperature, normal state conductivity linearly extrapolated to the value at the transition temperature, zero temperature penetration depths, etc., as observed in a rich variety of cuprate superconductors, are remarkably consistent with the universal critical properties of anisotropic systems which fall into the 3D‐XY universality class and undergo a crossover to a quantum critical point in 2D. The variety includes n‐ and p‐type cuprates, comprises the underdoped and overdoped regimes and the consistency extends up to six decades in the scaling variables. The resulting scaling relations for the oxygen isotope hydrostatic pressure effects agree with the experimental data and reveal that these effects originate from local lattice distortions preserving the volume of the unit cell. These observations single out 3D and anisotropic microscopic models which incorporate local lattice distortions, fall in the experimentally accessible regime into the 3D‐XY universality class, and incorporate the crossover to 2D quantum criticality where superconductivity disappears. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)