Electronic structure ofCeCoIn5

Kondo effect in the presence of van Hove singularities: A numerical renormalization group study

“…Here belong the compounds CeCoIn 5 (where the layers CeIn are present) [16], CeCoGe 2 [17], CePt 2 In 7 [18], CeRhIn 5 , Ce 2 RhIn 8 [19], UCo 0.5 Sb 2 (where twodimensional weak localization is observed) [20].…”

Angle-resolved and resonant photoemission spectroscopy on heavy-fermion superconductorsCe2CoIn8andRaj1, Iida2, Souma3 et al. 2005Phys. Rev. B

“…[18][19][20] However, a limited number of works in the literature are available for Ce-218 compounds on their physical properties. Ueda et al 16 performed dHvA experiment together with some physical-properties measurements for both Ce 2 RhIn 8 and La 2 RhIn 8 and reported that the Ce 4f electrons are localized in Ce 2 RhIn 8 .…”

Perturbing the Superconducting Planes in CeCoIn5 by Sn Substitution

“…This increase in T c has been attributed to the quasi-two dimensional (2D) structure [6,9]. In fact, a local density approximation (LDA) calculation finds no relevant hybridization of cobalt d-orbitals with cerium fband states, suggesting that the material can be thought of as a double-layered compound with two almost independent structures [11] as suggested by Shishido et al [12]. Furthermore, average charge correlations between Ce and In(1) are higher than between Ce and In(2) in this calculation [11], implying a tendency toward electronic dynamics in two dimensions.…”

“…In fact, a local density approximation (LDA) calculation finds no relevant hybridization of cobalt d-orbitals with cerium fband states, suggesting that the material can be thought of as a double-layered compound with two almost independent structures [11] as suggested by Shishido et al [12]. Furthermore, average charge correlations between Ce and In(1) are higher than between Ce and In(2) in this calculation [11], implying a tendency toward electronic dynamics in two dimensions. Measurements of the de Haas-van Alphen effect also reveal a cylindrical Fermi surface, much more 2D-like than either CeIrIn 5 or CeRhIn 5 , suggesting that the increasingly 2D electronic structure has a direct correlation with enhanced T c [13,14].…”