Neutron and magnetization studies of CeSb and CeSb1−xTex solid solutions

Infrared and Terahertz Spectroscopy of Strongly Correlated Electron Systems under Extreme Conditions

“…These lines must be phase boundaries. According to the magnetic phase diagram derived from neutron scattering, 146) the boundaries determined by our Rð!Þ measurement are in good agreement with the magnetic phase diagram. Therefore, the change in the Rð!Þ spectrum indicates a magnetic phase transition.…”

“…Despite the simple NaCl-type crystal structure, it has a highly complex magnetic phase diagram with 16 phases. 146) Because of the complex magnetic phase diagram and its heavy-Fermion-like physical properties, the material has attracted much attention over the past few decades. The origin of the complex magnetic phase diagram was qualitatively explained by the Ce 4f -Sb 5p mixing model (p-f mixing).…”

Competition of exchange and crystal field interactions in cerium monopnictides and monochalcogenides

“…This series of strongly correlated electron systems offers the opportunity to vary systematically, through chemical pressure, the lattice constant and the cerium separation on going down the pnictogen or chalcogen column, and hence tailor the degree of 4 f localization from the strongly localized limit in the heavier systems to to the weakly localized limit in the lighter systems. [1][2][3][4][5][6][7] The sensitivity of the hybridization, Coulomb exchange, and crystal-field ͑CF͒ interactions to the chemical environment gives rise to a variety of unusual magnetic properties.…”

“…8 In both the cerium monopnictides and monochalcogenides, the CF splitting between the ⌫ 7 doublet and the ⌫ 8 quartet decreases with increasing anion size, from 150 K for CeP to 8 K in CeBi and from 140 K for CeS to 32 K for CeTe, and it is about the same in both series, a rather surprising result in view of the additional valence electron on the chalcogen ion. 9 Neutron scattering experiments have shown 10 that the ⌫ 7 doublet is the CF ground state in all the cerium monopnictides and monochalcogenides.…”

“…12 Second, we apply an ab initio based approach synthesizing ͑1͒ a phenomenological theory of orbitally driven magnetism based on the Anderson and Kondo lattice model which incorporates explicitly the hybridization induced, the Coulomb exchange, and the crystal field interactions on an equal footing, and ͑2͒ FPLMTO electronic structure calculations allowing a first principles evaluation of all the parameters entering the model Hamiltonian, except for the crystal field interaction. To date, our attempts 13 to determine the CF splitting for this class of systems on a fully ab initio basis have not proven successful, and thus we use the experimental 10 CF value for each compound. In contrast to the first method, in the FPLMTO evaluation of the parameters entering the model Hamiltonian, the 4 f states are treated as localized, atomic-like, states and are placed in the core not being allowed to hybridize with the non-f states, in order to be consistent with the treatment of the f states in the Anderson-Kondo Hamiltonian.…”