Magnetic transition and Meissner shielding in ferromagnetic high-Tc superconductor RuSr2Gd1.4Ce0.6Cu2O10-δ

• Published in: The European physical journal. B, Condensed matter physics Condensed matter physics, 2009-05, Vol.69 (2), p.161-165
• Main Authors: Lv, Z. M., Wu, H. Y., Zhang, J. L., Li, M., Wei, Z., Li, H. O., Guo, X. F., Cao, L. Z., Ruan, K. Q.
• Format: Article
• Language: English
• Subjects: Complex Systems; Condensed Matter Physics; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Fluid- and Aerodynamics; Magnetic properties; Physics; Physics and Astronomy; Properties of type I and type II superconductors; Solid State and Materials; Solid State Physics; Superconductivity
• ISSN: 1434-6028; 1434-6036
• DOI: 10.1140/epjb/e2009-00117-4

The magnetic superconductor RuSr 2 Gd 1.4 Ce 0.6 Cu 2 O 10- δ was studied by means of detailed magnetization measurements in order to clarify its complex magnetic and superconducting properties. Our experiments agree with a model indicating that the in-plane component of the Ru moment might transform from a spin-glass ground state to a ferromagnetically coupled excited state by application of a small magnetic field below the magnetic transition temperature. The experiments also show that a full Meissner state is present at the low temperature, the low magnetic field region of the phase diagram. This is in contrast to the previous prediction that no Meissner state exists in this material for an internal magnetic field of several hundred Oersteds in the CuO 2 planes exerted by the Ru sublattice and exceeding the lower critical field.