Superconducting properties of single-crystalline &lt;em&gt;A&lt;/em&gt;&lt;sub&gt;x&lt;/sub&gt;Fe&lt;sub&gt;2-y&lt;/sub&gt;Se&lt;sub&gt;2&lt;/sub&gt; (&lt;em&gt;A&lt;/em&gt;=Rb, K) studied using muon spin spectroscopy

Shermadini, Z.; Luetkens, H.; Khasanov, R.; Krzton-Maziopa, A.; Conder, K.; Pomjakushina, E.; Klauss, H.-H.; Amato, A.

doi:10.1103/PhysRevB.85.100501

Superconducting properties of single-crystalline A_xFe_2-ySe₂ (A=Rb, K) studied using muon spin spectroscopy

Shermadini Z, Luetkens H, Khasanov R, Krzton-Maziopa A, Conder K, Pomjakushina E, Klauss H-H & Amato A

Citation

Shermadini, Z., Luetkens, H., Khasanov, R., Krzton-Maziopa, A., Conder, K., Pomjakushina, E., … Amato, A. (2012). Superconducting properties of single-crystalline A_xFe_2-ySe₂ (A=Rb, K) studied using muon spin spectroscopy. Physical Review B, 85(10), 100501 (5 pp.). https://doi.org/10.1103/PhysRevB.85.100501

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:12626

We report on the superconducting properties of A_xFe_2-ySe₂ (A=Rb, K) single crystals studied with the muon spin relaxation or rotation (μSR) technique. At low temperatures, close to 90% of the sample volumes exhibit large-moment magnetic order which impedes the investigation of their superconducting properties by μSR. On the other hand, about 10% of the sample volumes remain paramagnetic and clearly show a superconducting response. The temperature dependence of the superconducting carrier density was analyzed within the framework of a single s-wave gap scenario. The zero-temperature values of the in-plane magnetic penetration depths λ_ab(0) = 258(2) and 225(2) nm and the superconducting gaps Δ(0) = 7.7(2) and 6.3(2) meV have been determined for A = Rb and K, respectively. The microscopic coexistence and/or phase separation of superconductivity and magnetism is discussed.