biostudies-literatureUnknown7(3)Wolff KKA representative of the fluoride-containing iron pnictide high-temperature superconductors, namely CaFFeAs, was doped with sodium up to the composition Ca_0.86Na_0.14FFeAs for the first time. Single crystals with an edge length in the range of 0.1 - 2.0 mm were obtained via solid-state and flux syntheses, respectively. The composition of the crystals was verified by means of single crystal X-ray diffractometry and energy dispersive X-ray spectroscopy (EDX). Measurements of the electrical resistivity, as well as the magnetization on a crystal of Ca_0.89Na_0.11FFeAs both show a transition to the superconducting state on cooling to 34.5 K. Investigations of the upper critical fields reveal an anisotropy ratio of about five. The lattice parameters and moMaterials (Basel, Switzerland)1984-1994https://www.ebi.ac.uk/biostudies/studies/S-EPMC5453247biostudies-literatureSynthesis and Characterization of Superconducting Ca₁_-<i>_x</i>Na<i>_x</i>FFeAs.PMC5453247Shlyk LSchleid TRose EWolff KKBischoff MNiewa RfalseSynthesis and Characterization of Superconducting Ca₁_-<i>_x</i>Na<i>_x</i>FFeAs.A representative of the fluoride-containing iron pnictide high-temperature superconductors, namely CaFFeAs, was doped with sodium up to the composition Ca_0.86Na_0.14FFeAs for the first time. Single crystals with an edge length in the range of 0.1 - 2.0 mm were obtained via solid-state and flux syntheses, respectively. The composition of the crystals was verified by means of single crystal X-ray diffractometry and energy dispersive X-ray spectroscopy (EDX). Measurements of the electrical resistivity, as well as the magnetization on a crystal of Ca_0.89Na_0.11FFeAs both show a transition to the superconducting state on cooling to 34.5 K. Investigations of the upper critical fields reveal an anisotropy ratio of about five. The lattice parameters and mo2014-01-01T00:00:00Z2014 Mar2025-04-05T14:24:38.027Z2019-03-27T02:46:29ZS-EPMC54532472878855110.3390/ma7031984