Magnetic, electronic and transport properties of the Ce3Ag4X4 (X=Ge, Sn) compounds

One-dimensional Gold Clusters in HP-Ce7Au13+xGe10–x

“…The Ce1 and Ce2 atoms are part of a slab that is known for the EuAuGe type [34]. Ce4 has similar coordination to Ce 3 Ag 4 Ge 4 [35], two planar hexagons built up from four transition metal and two germanium atoms each. The coordination of the Ce3 atoms is similar to the pattern in ordered BaAl 4 phases.…”

Ce4Ag3Ge4O0.5 – chains of oxygen-centered [OCe2Ce2/2] tetrahedra embedded in a [CeAg3Ge4] intermetallic matrix

“…43 Interestingly, the phase Ce 3 Ag 4 Ge 4 was observed several times as a by-product during the various syntheses of Ce 4 Ag 3 Ge 4 O 0.5 . In contrast to the results of Szytuła et al, 43 who presented neutron diffraction data on polycrystalline samples, the crystallinity of Ce 3 Ag 4 Ge 4 , prepared under HP/HT conditions, allowed us to perform a single crystal structure determination with precise structural data ( Tables 1 and 2). For a more detailed crystal chemical description of that structure type, refer to a publication on isotypic Yb 3 Pd 4 Ge 4 .…”

Comments on the thermoelectric power of the f-electron metallic compounds

“…In order to examine the dependence of the total thermoelectric power S(t) on the reduced temperature t = T /T D we use Kohler rule (7). Some general conclusions about S(t) can be drawn directly from this rule when we account the results of Sections III and IV.B.…”

“…1,2 The fundamental researches are focused both on the SCES, see e.g. Refs [3][4][5][6][7][8][9][10][11] as well as on the well-localized f-electron systems (WLS) -see Refs [12][13][14][15][16][17][18][19]. The thermoelectric power (TEP) of the SCES reaches typically the values one or two orders greater than those of the WLS, but in both material groups it exhibits the anomalies as the sign change and/or the maxima (minima).…”

“…In some experimental works (see e.g. Refs [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]) one can find the interpretations of TEP anomalies as caused by the isotropic s-f exchange scattering (in the one-band approach for the conduction electrons) and/or the electron-phonon scattering -considered in the Born approximation. These interpretations are based on the results of Refs [34][35][36] where the TEP maxima and the sign reversal were obtained within these oversimplified models.…”