Transport and NMR characteristics of the skutterudite-related compound Ca3Rh4Sn13статья
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Аннотация:We report the electronic properties of the Yb3Rh4Sn13-type single crystalline Ca3Rh4Sn13 by
means of the electrical resistivity, Hall coefficient, Seebeck coefficient, thermal conductivity, as
well as 119Sn nuclear magnetic resonance (NMR) measurements. The negative sign of the Hall
coefficient and Seebeck coefficient at low temperatures suggests that the n-type carriers
dominate the electrical transport in Ca3Rh4Sn13, in contrast to the observations in Sr3Rh4Sn13
which has a p-type conduction. Such a finding indicates a significant difference in the electronic
features between these two stannides. Furthermore, we analyzed the temperature-dependent
119Sn NMR spin-lattice relaxation rate for Ca3Rh4Sn13, (Sr0.7Ca0.3)3Rh4Sn13, and Sr3Rh4Sn13 to
examine the change of the electronic Fermi-level density of states (DOS) in (Sr1-xCax)3Rh4Sn13. It
indicates that the Sn 5s partial Fermi-level DOS enhances with increasing the Ca content, being
consistent with the trend of the superconducting temperature. Since the total Fermi-level DOS
usually obeys the same trend of the partial Fermi-level DOS, the NMR analysis provides
microscopic evidence for the correlation between the electronic DOS and superconductivity of
the (Sr1-xCax)3Rh4Sn13 system.