Charge Order, Metallic Behavior, and Superconductivity in La2−xBaxCuO4 with x=1/8
C. C. Homes, S. V. Dordevic, G. D. Gu, Q. Li, T. Valla, J. M. Tranquada
DOI 10.1103/PhysRevLett.96.257002 · Physical Review Letters
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Abstract
The ab-plane optical properties of a cleaved single crystal of La2−xBaxCuO4 for x=1/8 (Tc≃2.4 K) have been measured over a wide frequency and temperature range. The low-frequency conductivity is Drude-like and shows a metallic response with decreasing temperature. However, below ≃60 K, corresponding to the onset of charge-stripe order, there is a rapid loss of spectral weight below about 40 meV. The behavior is quite different from that typically associated with the pseudogap in the normal state of the cuprates. Instead, the gapping of the normal-state single-particle excitations looks surprisingly similar to that observed in superconducting La2−xSrxCuO4, including the presence of a residual Drude peak with reduced weight.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xBaxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.4 | Pressure not reported | onset |
| La1.875Ba0.125CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.4 | Pressure not reported | onset |
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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