Stationary Josephson current in junctions involving d-wave superconductors with charge density waves: the temperature dependence and deviations from the law of corresponding states
1 Institute of Physics, NASU, 46, Nauka Ave., 03680 Kyiv, Ukraine
2 Institute of Physics, PAN, Al. Lotników 32/46, 02-668 Warsaw, Poland
Received: 8 December 2013
Published online: 19 May 2014
Stationary Josephson current Ic in symmetric and non-symmetric junctions involving d-wave superconductors with charge density waves (CDWs) was calculated. It was found that, if CDWs are weak or absent, there exists an approximate proportionality between Ic and the product of superconducting order parameters in the electrodes (the law of corresponding states) for several factors affecting those quantities, such as the temperature, T, or one of the parameters characterizing the combined CDW superconducting phase (the degree of the Fermi surface dielectric gapping and the ratio between the parent superconducting and CDW order parameters). Otherwise, the dependences Ic(T) were shown to deviate from those in the absence of CDWs, and the relevant corresponding-state dependences from linearity, the deviations being especially strong at certain rotation angles of crystalline electodes with respect to the junction plane. Hence, making use of specially designed experimental setups and analyzing the Ic(T) and corresponding-state dependences, the existence of CDWs in cuprates and other non-conventional superconductors can be detected.
Key words: Solid State and Materials
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2014