Magnetic properties of the layered superconductor Li0.48(THF)0.3HfNCl with Tc∼26 K

We report on DC-magnetization measurements on an oriented polycrystalline sample of the layered superconductor Li 0.48 (THF) 0.3 HfNCl having T c ∼ 26 K. For the applied field perpendicular to the basal-plane (ab-plane), we found that diamagnetic moments appear at temperature as high as T ∼ 2 × T c , with increasing strength of the applied field. This indicates the existence of strong two-dimensional superconducting fluctuations. The anisotropy of superconducting parameters such as the upper critical field and Ginzburg-Landau coherence length demonstrates the highly anisotropic character for the present superconductor. It is suggested that Li 0.48 (THF) 0.3 HfNCl is a quasi-two-dimensional superconductor.