Zhi-Cheng Wang

Superconductivity in KCa2Fe4As4F2 with Separate Double Fe2As2 Layers

We report the synthesis, crystal structure, and physical properties of a quinary iron arsenide fluoride, KCa2Fe4As4F2. The new compound crystallizes in a body-centered tetragonal lattice (space group I4/mmm, a = 3.8684(2) Å, c = 31.007(1) Å, Z = 2) that contains double Fe2As2 conducting layers separated by insulating Ca2F2 layers. Our measurements of electrical resistivity, direct-current magnetic susceptibility, and heat capacity demonstrate bulk superconductivity at 33 K in KCa2Fe4As4F2.

Multigap superconductivity in ThAsFeN investigated using μSR measurements

We have investigated the superconducting ground state of the newly discovered superconductor ThFeAsN with a tetragonal layered crystal structure using resistivity, magnetization, heat capacity and transverse-field (TF) muon-spin rotation (

Superconductivity at 35 K by self doping in RbGd2Fe4As4O2

\mu

Physical properties and electronic structure of Sr

SR) measurements. Our resistivity and magnetization measurements reveal an onset of bulk superconductivity with

_2

T_{\bf c}\sim

Cr

30 K. The heat capacity results show a very small anomaly,

_3

\Delta

As

C

_2

_{ele}