Optical study of superconducting Pr2CuOx with x≃4
G. Chanda, R. P. S. M. Lobo, E. Schachinger, J. Wosnitza, M. Naito, A. V. Pronin
DOI 10.1103/PhysRevB.90.024503 · Physical Review B
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Abstract
Superconducting Pr2CuOx,x≃4 (PCO), films with T′ structure and a Tc of 27 K have been investigated by various optical methods in a wide frequency (7–55 000cm−1) and temperature (2–300 K) range. The optical spectra do not reveal any indication of a normal-state gap formation. A Drude-like peak centered at zero frequency dominates the optical conductivity below 150 K. At higher temperatures, it shifts to finite frequencies. The detailed analysis of the low-frequency conductivity reveals that the Drude peak and a far-infrared (FIR) peak centered at about 300cm−1 persist at all temperatures. The FIR-peak spectral weight is found to grow at the expense of the Drude spectral weight with increasing temperature. The temperature dependence of the penetration depth follows a behavior typical for d-wave superconductors. The absolute value of the penetration depth for zero temperature is 1.6μm, indicating a rather low density of the superconducting condensate.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pr2CuOx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 27 | Pressure not reported | onset |
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