Origin of different critical temperatures in oxide superconductors: A comparison of (Tl,Cd)2(Ba,La)2CuO6 with (La,Ba)2CuO4 by Raman and infrared-absorption spectroscopy
D. Mihailovic´, T. Mertelj, K. F. Voss, A. J. Heeger, N. Herron
DOI 10.1103/PhysRevB.45.8016 · Physical Review B
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Abstract
We observe significant frequency shifts of oxygen vibrations in (Tl,Cd)2(Ba,La)2CuO6+δ upon doping; the frequency shifts result from charge transfer from the intermediate TlO2 layers to the CuO2 planes. These observations are interpreted by comparison with data on (La,Ba)2CuO4+δ, which is isostructural with (Tl,Cd)2(Ba,La)2CuO6+δ, except that it contains no intermediate TlO2 filling layers. The data suggest that the twice higher Tc in the Tl compound results from a superconducting pairing interaction between carriers in the CuO2 planes aided by dynamic charge transfer along the c axis, with the polarizable structure between the conducting layers playing an important role.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Tl2Ba2CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | unknown |
| (La,Ba)2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35 | Pressure not reported | unknown |
| Tl2-yCdyBa2-xLaxCuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | unknown |
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