ISSN:
1572-9605
Keywords:
phase diagram
;
critical fluctuations
;
isotope effect
;
polarons
;
magnetic torque
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
Abstract Studies of the critical behavior of high-temperature superconductors (HTSC) show the importance of the strong doping dependence of the effective mass anisotropy γ for the generic (T, x) phase diagram of these materials. A possible microscopic model that can explain the doping dependence of γ is based on polaronic charge carriers. That lattice effects may play a role for high-temperature superconductivity is further supported by measurements of the oxygen-isotope effect on the in-plane penetration depth λ ab (0) in underdoped La2−x Sr x CuO4 single crystals that are reported in this paper. The oxygen-isotope effect on λ−2 ab (0) is found to be around −9% for the samples investigated. It arises mainly from the oxygen–mass dependence of the in-plane effective mass m* ab . The experimental facts presented in this paper suggest that lattice vibrations are important for the occurrence of high-temperature superconductivity.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1026402324799
Permalink