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Ta2PdxS5 (x < 1.0) was found to show superconductivity at Tc ~ 6 K. The temperature dependent resistivity of single crystalline Ta2Pd0.92S5 showed that the system is strongly disordered due to Pd deficiencies and close to Anderson localized state. Superconductivity in the dirty limit as well as the temperature dependence of specific heat C(T) implies that superconductivity is s-wave. The upper critical field Hc2 at T = 0 K limit with the magnetic field parallel to the TaS6 chains was found to be as high as 31 T, exceeding the Pauli paramagnetic limit Hp = 10.2 T by a factor of 3. We argue that the absence of the paramagnetic pair-breaking originates from strong spin-orbit scattering due to Pd deficiencies embedded in the periodic lattice of heavy 5d Ta and 4d Pd.
Moire quantum matter has emerged as a novel materials platform where correlated and topological phases can be explored with unprecedented control. Among them, magic-angle systems constructed from two or three layers of graphene have shown robust supe
A directed narrow jet of an organo-metallic gas containing a heavy metal can be decomposed by an accelerated beam of gallium ions, leaving behind a track made up of a complex residue of gallium, heavy metal and carbon. The process is highly controlla
The upper critical field Hc2(T) of the multiband superconductor KFe2As2 has been studied via low-temperature thermal expansion and magnetostriction measurements. We present compelling evidence for Pauli-limiting effects dominating Hc2(T) for H || a,
A new iron arsenide superconducting system LiFeAs was found that crystallizes into a tetragonal structure with space group P4/nmm. The superconductivity with Tc up to 18 K was observed in the compounds. This simple 111 type layered iron arsenide supe
Here we report the fabrication and superconductivity of the iron-based arsenic-oxide GdFeAsO1-delta compound with oxygen-deficiency, which has an onset resistivity transition temperature at 53.5 K. This material has a same crystal structure as the ne