Magnetic properties of cerium monopnictides

Electronic Structures and Mechanical Properties of Intermetallics

“…36 " 37 This series of strongly correlated electron systems offers the opportunity to vary systematically, through chemical pressure, the lattice constant and the cerium-cerium separation on going down the pnictogen'or chalcogen column, and hence tailor the degree of 4f localization from the strongly correlated limit in the heavier systems to the weakly correlated limit in the lighter systems. The sensitivity of the hybridization.…”

Development of magnetism in strongly correlated cerium systems: Non-Kondo mechanism for moment collapse

“…The low-temperature ordered magnetic moment increases with increasing lattice constant for the pnictides from 0.80 B in CeP to 2.1 B in CeSb and CeBi, 6,7 while it decreases with increasing lattice constant for the chalcogenides from 0.57 B in CeS to 0.3 B in CeTe. [6][7][8] The magnetic moment collapse from CeSb to CeTe, with both systems having about the same lattice constant, is indicative of the sensitivity of the magnetic interactions to chemical environment. The ordering temperature increases from 8 K in CeP to 26 K in CeBi for the pnictides, whereas it decreases from 8.4 K in CeS to 2.2 K in CeTe.…”

“…[6][7][8][9][10][11][12] These strongly correlated electron systems offer the opportunity to vary systematically the chemical environment and cerium-cerium separation on going down the pnictogen or chalcogen column, and hence tailor the degree of 4 f localization from the weakly correlated limit in the lighter systems to the strongly correlated limit in the heavier systems. [6][7][8][9][10][11][12] The calculated single-impurity Kondo temperature, presented below, is much smaller than the magnetic ordering temperature; hence this series lies in the magnetic regime of the Kondo phase diagram. 13 Nevertheless, we demonstrate that the sensitivity of the band-f hybridization, band-f Coulomb exchange, and crystal-field ͑CF͒ interactions to chemical environment gives rise to a variety of interesting unusual magnetic properties, in agreement with experiment across the series, including the occurrence of a non-Kondo moment collapse.…”

“…The ordering temperature increases from 8 K in CeP to 26 K in CeBi for the pnictides, whereas it decreases from 8.4 K in CeS to 2.2 K in CeTe. [6][7][8][9][10][11][12]14 Another unusual feature is the large suppression of the CF splitting ⌬ CF of the Ce 3ϩ 4 f 5/2 multiplet between the ⌫ 7 -doublet CF ground state and the excited ⌫ 8 quartet, from values expected from the behavior of the heavier isostructural rareearth pnictides or chalcogenides. 15,16 This can be understood 17 as arising from band-f hybridization effects.…”

“…6,14 The sign ͑FM or AF͒ of the ͉Ϯ5/2͘ matrix elements of the 6ϫ6 exchange matrix determines the interplanar interaction between successive ͑001͒ Ce planes. We find, that for the heavier compounds ͑CeBi and CeSb͒ the ͉Ϯ5/2͘ matrix elements of the Coulomb exchange matrix are FM and hence favor the ↑↑↓↓ type, while in the lighter systems ͑CeAs and CeP͒ the ͉Ϯ5/2͘ matrix elements of the hybridization-induced two-ion matrix are AF, and hence they favor the ↑↓ type.…”