H-T phase diagram and the nature of Vortex-glass phase in a quasi two-dimensional superconductor: Sn metal layer sandwiched between graphene sheets
arXiv:cond-mat/0308311 · doi:10.1016/j.physc.2003.10.001
Abstract
The magnetic properties of a quasi two-dimensional superconductor, Sn-metal graphite (MG), are studied using DC and AC magnetic susceptibility. Sn-MG has a unique layered structure where Sn metal layer is sandwiched between adjacent graphene sheets. This compound undergoes a superconducting transition at = 3.75 K at = 0. The - diagram of Sn-MG is similar to that of a quasi two-dimensional superconductors. The phase boundaries of vortex liquid, vortex glass, and vortex lattice phase merge into a multicritical point located at = 3.4 K and = 40 Oe. There are two irreversibility lines denoted by (de Almeida-Thouless type) and (Gabay-Toulouse type), intersecting at = 2.5 K and = 160 Oe. The nature of slow dynamic and nonlinearity of the vortex glass phase is studied.
24 pages, 13 figures; Physica C (2003), in press