Coexistence of Superconductivity and Antiferromagnetism in High-T C Gd1+x Ba2−x Cu3O7−δ Superconductor

Investigation of Hydrogen Incorporations in Bulk Infinite-Layer Nickelates

“…Neutron diffraction was performed at the high-resolution powder neutron diffractometer HRPT [31] at the Spallation Neutron Source SINQ at the Paul Scherrer Institute in Villigen. For the HRPT experiments, an amount of 340 mg of LaNiO 2 was enclosed into a vanadium can with an inner diameter of 6 mm, where the remaining space of the vanadium can was shielded with Cd foil, and the measurement was carried out at 1.5 K in a 4 He bath cryostat with a neutron wavelength of 1.15 Å.…”

“…Superconductivity exists in various hydrogen-containing compounds, highlighted by the recent discoveries of critical temperatures T c as high as room temperature for hydride compounds formed under extreme pressures [1,2]. Metal hydroxide-intercalated iron chalcogenides, such as (Li 0.8 Fe 0.2 )OHFeSe [3], show coexistence of antiferromagnetic order and superconductivity, a feature known from some high-T c superconductors [4]. Electron-doped 1111 iron pnictides, such as RFeAsO 1−x H x [5,6], CeFeAsO 1−x H x [7], and the pnictogen-free LaFeSiH [8] are a class, where the introduction of charge carriers via doping with hydrogen drives the system from an antiferromagnetically ordered state toward superconductivity.…”

Investigation of hydrogen incorporations in bulk infinite-layer nickelates

“…1) and literature [37]. Another possibility to refine mixed occupancy is by constraining an equal occupation of O and H as LaNiO 2 (OH) x , which converges to 0.18 (4). However, this would rather suggest an OH molecule with typical distances around 0.84 Å, which would realize negative scattering [39] and thus reduces the quality of the fit and shifts the occupation again down to 0.06 (1).…”

“…Neutron diffraction was performed at the highresolution powder neutron diffractometer HRPT [31] at the spallation neutron source SINQ at the Paul Scherrer Institute in Villigen. For the HRPT experiments, an amount of 340 mg of LaNiO 2 was enclosed into a vanadium can with an inner diameter of 6 mm, where the remaining space of the vanadium can was shielded with Cd foil and the measurement was carried out at 1.5 K in a 4 He bath cryostat with a neutron wavelength of 1.15 Å.…”

“…Superconductivity exists in various hydrogen containing compounds, highlighted by the recent discoveries of critical temperatures T c as high as room temperature for hydride compounds formed under extreme pressures [1,2]. Metal hydroxide-intercalated iron chalcogenides, such as (Li 0.8 Fe 0.2 )OHFeSe [3], show coexistence of antiferromagnetic order and superconductivity, a feature known from some high-T c superconductors [4]. Electrondoped 1111 iron pnictides as RFeAsO 1−x H x [5,6], CeFeAsO 1−x H x [7], and the pnictogen-free LaFeSiH [8] are a class, where the introduction of charge carriers via doping with hydrogen drives the system from an antiferromagnetically ordered state towards superconductivity.…”