Mixed-state microwave resistivity in RE–BaCuO films

• Published in: Physica. C, Superconductivity Vol. 404; no. 1; pp. 350 - 353
• Main Authors: Silva, E., Marcon, R., Muzzi, L., Pompeo, N., Fastampa, R., Giura, M., Sarti, S., Boffa, M., Cucolo, A.M., Cucolo, M.C.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.05.2004; Elsevier Science
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; High-tc films; Microwave resistivity; Physics; Properties of type I and type II superconductors; Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.); RE–BaCuO films; Superconducting films and low-dimensional structures; Superconductivity; Vortex lattices ,flux pinning, flux creep; RE–BaCuO films; Microwave resistivity; Magnetic flux; Electrical conductivity; Mixed state; Magnetic field effects; Experimental study; Cuprates; Thin films; Quasiparticles; RE-BaCUO films; Superconducting films; Microwave conductivity; Vortices; High-Tc superconductors; Vortex motion
• ISSN: 0921-4534; 1873-2143
• DOI: 10.1016/j.physc.2003.11.031

We present measurements of the microwave complex resistivity at 48 GHz in REBa 2Cu 3O 7− δ thin films (RE=Y, Sm) in moderate magnetic fields ( μ 0 H<0.8 T) and above 60 K. The measured complex resistivity gives valuable information for the study of vortex dynamics. We show that the field dependence of the microwave resistivity has rather different behaviours in YBa 2Cu 3O 7− δ and SmBa 2Cu 3O 7− δ . By applying the conventional model of vortex motion, the data in SmBa 2Cu 3O 7− δ would yield exotic behaviours for the vortex parameters. However, taking into account the enhanced field-induced change in quasiparticle density in a superconductor with lines of nodes in the gap, the vortex part of the response behaves similarly in YBa 2Cu 3O 7− δ and SmBa 2Cu 3O 7− δ .