Nonmagnetic4fShell in the High-Pressure Phase of SmS

Enhancement of superconductivity inLa1−xSmxO0.5F0.5BiSFang1, Yazici2, White3 et al. 2015Phys. Rev. BSelf Cite390370View full textAdd to dashboardCite

“…33 The effective magnetic moment of the samples are considerably smaller than the free Sm 3+ ion value of 0.845 µ B /Sm atom. Similar low values of µ ef f have been reported in other studies 36,37 and are not necessarily evidence for an intermediate valence for Sm; an accurate theoretical description of experimental data in Sm systems is complicated by the combined effects of the crystalline electric field (CEF) effects and J-mixing. 38 The results of specific heat C measurements for x = 0.1, 0.8, and a nonmagnetic reference compound LaOBiS 2 are dis- played in Fig.…”

A new cubic perovskite in PbGeO3 at high pressures

“…To our knowledge, this kind of phenomenon appears only in few materials. The isostructural phase transitions are usually considered to be originating from an electronic structural change in the matters; such transitions appear in cubic Ce (γ-α) (Hall et al 1964), SmS (B1) (Maple and Wohlleben 1971), and hexagonal MnO (B8) (Yoo et al 2005) at room temperature and 0.7, 0.65, and ∼110 GPa with the volume reductions of 15.0, 13.6, and 6.6%, respectively. The transitions of γ-α in Ce and B1-B1 in SmS occur when the localized f-electron becomes delocalized (Lipp et al 2008;Barla et al 2004); the B8-B8 transition in MnO is considered as Figure 3.…”

Resolution of the discrepancy between the variation of the physical properties of Ce1-xYbxCoIn5single crystals and thin films with Yb composition

“…This relation is often used to estimate the valence of lanthanide ions, which have valence instabilities such as Ce, whose valence can range from 3+ to 4+, and Sm, Eu, Tm, and Yb, whose valence can range from 2+ to 3+ [Maple71,Maple74]. In this work, we instead employ Vegard's law in a different manner to estimate the actual Yb concentration x act in the Ce 1--x Yb x CoIn 5 system using the valences of the Ce and Yb ions, derived from spectroscopic measurements, and the tetragonal a--and c--lattice parameters, determined from x--ray diffraction measurements on powdered In Fig.…”

“…The analysis is unusual, since we are using the known valences of Ce and Yb as a function of x to determine the actual Yb concentration x act (assuming that all of the lanthanide sites in the compounds are occupied by Ce or Yb ions; i.e., no lanthanide vacancies). In the usual Vegard's law analysis, the lanthanide sites are occupied by lanthanide ions according to their nominal concentrations, and the deviations of the lattice parameters from Vegard's law are used to estimate the valence of one of the lanthanide ions [Maple71,Maple74]. Direct support for the Vegard's law analysis is provided by energy dispersive x--ray spectroscopy (EDS), wavelength dispersive x--ray spectroscopy (WDS), and transmission x--ray absorption edge spectroscopy (TXAS) measurements on selected single crystals, which are reported herein.…”