Rustem Khasanov

Coexistence of magnetism and superconductivity in the iron-based compound Cs0.8(FeSe0.98)2.

We report on muon-spin rotation and relaxation (μSR), electrical resistivity, magnetization and differential scanning calorimetry measurements performed on a high-quality single crystal of Cs(0.8)(FeSe(0.98))(2). Whereas our transport and magnetization data confirm the bulk character of the superconducting state below T(c)=29.6(2)  K, the μSR data indicate that the system is magnetic below T(N)=478.5(3)  K, where a first-order transition occurs. The first-order character of the magnetic transition is confirmed by differential scanning calorimetry data. Taken all together, these data indicate in Cs(0.8)(FeSe(0.98))(2) a microscopic coexistence between the superconducting phase and a strong magnetic phase. The observed T(N) is the highest reported to date for a magnetic superconductor.

Synthesis, crystal structure, and chemical stability of the superconductor FeSe1−x

We report on a comparative study of the crystal structure and the magnetic properties of FeSe1−x (x=0.0–0.15) superconducting samples by neutron powder-diffraction and magnetization measurements. The samples were synthesized by two different methods: a “low-temperature” one using powders as a starting material at T≃700 °C and a “high-temperature” method using solid pieces of Fe and Se at T≃1075 °C. The effect of a starting (nominal) stoichiometry on the phase purity of the obtained samples, the superconducting transition temperature Tc, as well as the chemical stability of FeSe1−x at ambient conditions were investigated. It was found that in the Fe-Se system, a stable phase exhibiting superconductivity at Tc≃8 K exists in a narrow range of selenium concentration (FeSe0.974±0.005).

Strong coupling between magnetic and structural order parameters in SrFe2As2

X-ray and muon spin-relaxation experiments performed on

Coexistence of incommensurate magnetism and superconductivity in Fe 1 + y Se x Te 1 − x

{\text{SrFe}}_{2}{\text{As}}_{2}

Superconductivity in a new layered bismuth oxyselenide: LaO0.5F0.5BiSe2

polycrystals confirm a sharp first-order transition at

Iron isotope effect on the superconducting transition temperature and the crystal structure of FeSe1−x

{T}_{0}=205\text{ }\text{K}

Evidence for time-reversal symmetry breaking in superconducting PrPt4Ge12

corresponding to an orthorhombic phase distortion and to a commensurate antiferromagnetic Fe ordering with a larger distortion and larger size of the ordered moment than reported for

Evolution of two-gap behavior of the superconductor FeSe_{1-x}

{\text{BaFe}}_{2}{\text{As}}_{2}

Microscopic coexistence of superconductivity and magnetism in Ba(1-x)K(x)Fe2As2.

. The structural and the magnetic order parameters present a remarkable similarity in their temperature dependence from

Superconducting properties of single-crystalline A x Fe 2 − y Se 2 ( A = Rb, K) studied using muon spin spectroscopy

{T}_{0}