Compressibility of $Ce M In_5$ and $Ce_2 M In_8$ (M = Rh, Ir and Co) Compounds

Details Compressibility of $Ce M In_5$ and $Ce_2 M In_8$ (M = Rh, Ir and Co) Compounds Compressibility of $Ce M In_5$ and $Ce_2 M In_8$ (M = Rh, Ir and Co) Compounds

2004-05-03

arxiv.org/abs/cond-mat/0405043v2

Physics

Condensed Matter

Strongly Correlated Electrons

Updated version resubmitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.70.214526

The lattice parameters of the tetragonal compounds Ce$M$In$_{5}$ and Ce$_{2}M$In$_{8}$($M=$Rh, Ir and Co) have been studied as a function of pressure up to 15 GPa using a diamond anvil cell under both hydrostatic and quasihydrostatic conditions at room temperature. The addition of $M$In$_{2}$ layers to the parent CeIn$_{3}$ compound is found to stiffen the lattice as the 2-layer systems (average of bulk modulus values $B_{0}$ is 70.4 GPa) have a larger $B_{0}$ than CeIn$_{3}$ (67 GPa), while the 1-layer systems with the are even stiffer (average of $B_{0}$ is 81.4 GPa). Estimating the hybridization using parameters from tight binding calculations shows that the dominant hybridization is $fp$ in nature between the Ce and In atoms. The values of $V_{pf}$ at the pressure where the superconducting transition temperature $T_{c}$ reaches a maximum is the same for all Ce$M$In$_{5}$ compounds. By plotting the maximum values of the superconducting transition temperature $T_{c}$ versus $c/a$ for the studied compounds and Pu-based superconductors, we find a universal $T_{c}$ versus $c/a$ behavior when these quantities are normalized appropriately. These results are consistent with magnetically mediated superconductivity.

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