Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf
Optical investigation of nominally undoped Pr2CuO4 films
Chanda, G.; Pronin, A. V.; Lobo, R. P. S. M.; Wosnitza, J.; Yamamoto, H.; Naito, M.
Superconducting Pr2CuO4 films with T′ structure and Tc beetween 25 and 27 K have been investigated by different optical methods in a wide frequency range (5 – 55000 cm−1) and for temperatures from 2 to 300 K. From the infrared reflectivity spectra, a superconducting gap of 2Δ0 = 17 meV = 7.4 κBTc is estimated. Absolute values of the London penetration depth (ΔL) have been calculated from phase-sensitive teraherz measurements. The zero-temperature limit of (ΔL) is 1.6 µm. The overall temperature dependence of (ΔL)shows a behavior typical for the cuprates. However, a closer look on the penetration depth at low temperatures reveals a flattening of the temperature dependence. We find (ΔL)(T) ∝ Tn with n = 2.8 ± 0.2.
Frühjahrstagung der DPG, 25.-30.03.2012, Berlin, Deutschland