X-ray photoelectron spectroscopy study on YbFe2As2 crystals prepared by different growth temperatures

Effective Enrichment of Low-Concentration Rare-Earth Ions by Three-Dimensional Thiostannate K2Sn2S5

“…The Sn 3d 3/2 and 3d 5/2 of Sn 4+ were observed at 494.6 and 486.1 eV, respectively, and a peak at 161.8 eV was the characteristic peak for S 2p . As displayed in Figure b, the high-resolution spectrum of Yb 4d exhibits the five characteristic peaks of the binding energy for Yb 3+ located at 186.1, 189.8, 198.7, 200.5, and 206.7 eV. − Moreover, an additional peak is also detected at 194.0 eV, which could be assigned to the satellite peak of Yb 3+ . The multiformity of positive trivalent oxidation levels in the spectrum is due to the strong influence on the 4d spectrum of Yb by the Coulomb interaction. , In addition, Raman spectra of KTS-2 and Yb-KTS-2 have been recorded to investigate the interactions between Yb 3+ ions and S 2– ions (Figure S6).…”

“…52−54 Moreover, an additional peak is also detected at 194.0 eV, which could be assigned to the satellite peak of Yb 3+ . 55 The multiformity of positive trivalent oxidation levels in the spectrum is due to the strong influence on the 4d spectrum of Yb by the Coulomb interaction. 56,57 In addition, Raman spectra of KTS-2 and Yb-KTS-2 have been recorded to investigate the interactions between Yb 3+ ions and S 2− ions (Figure S6).…”

Investigation on specific heat and Raman spectroscopy of YbFe2As2

“…A polycrystalline sample of YbFe 2 As 2 has been synthesized via solid-state reaction route. A detailed synthesis procedure could be found elsewhere [4]. The structural properties of the YbFe 2 As 2 crystals was studied with the help of low temperature XRD experiments performed using a Rigaku diffractometer (Dmax) two-circle goniometer fixed in Bragg-Brentano geometry, equipped with a graphite (002) monochromator and mounted on a Cu-Kα rotating-anode x-ray generator which can work at 10 kW.…”

“…All parent compounds based on FeAs, lack superconductivity but do have commensurate antiferromagnetic spin order with a stripe pattern, which is accompanied by a structural transition at around 150 K [2] with significant effects on electrical resistivity and magnetism [3]. These compounds can be chemically doped or subjected to external pressure to induce superconductivity [4]. The discovery of superconductivity in iron-pnictide compounds [5][6][7][8], which emerges in close proximity to magnetic instability [9][10][11][12], opens up new avenues for studying quantum critical phenomena in systems with multiple order parameters.…”