Anomalous Fermi liquid behavior of overdoped high-Tc superconductors
H. Castro, G. Deutscher
DOI 10.1103/PhysRevB.70.174511 · Physical Review B
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Abstract
According to a generic temperature versus carrier-doping (T−p) phase diagram of high-temperature superconductors (HTSC), it has been proposed that as doping increases to the overdoped region, they approach gradually a conventional (canonical) Fermi liquid. However, Hall effect measurements in several systems reported by different authors show a still strong T dependence in overdoped samples. We report here electrical transport measurements of Y1−xCaxBa2Cu3O7−δ thin films presenting a temperature dependence of the Hall constant, RH, which does not present a gradual transition towards the T-independent behavior of a canonical Fermi liquid. Instead, the T dependence passes by a minimum near optimal doping and then increases again in the overdoped region. We discuss the theoretical predictions from two representative Fermi liquid models and show that they cannot give a satisfactory explanation to our data. We conclude that this region of the phase diagram in YBCO, as in most HTSC, is not a canonical Fermi liquid, therefore we call it an anomalous Fermi liquid.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y1-xCaxBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure unresolved | onset |
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