Supression of electron correlations in the superconducting alloys of Rh$_{17-x}$Ir$_x$S$_{15}$

Details Supression of electron correlations in the superconducting alloys of Rh$_{17-x}$Ir$_x$S$_{15}$ Supression of electron correlations in the superconducting alloys of Rh$_{17-x}$Ir$_x$S$_{15}$

2009-10-23

arxiv.org/abs/0910.4478v2

Volume 470, Issues 17-18, 1 September 2010, Pages 682-684

Physics

Condensed Matter

Superconductivity

5 figures and 1 table, accepted in Physica C

Scientific paper

10.1016/j.physc.2010.06.011

We have studied the effect of Iridium doping (Rh$_{17-x}$Ir$_{x}$S$_{15}$) in the Rhodium sites of the strongly correlated superconductor Rh$_{17}$S$_{15}$. Even at low levels of doping (x = 1 and 2) we see a drastic change in the superconducting properties as compared to those of the undoped system. We deduce that there is a reduction in the density of states at the Fermi level from reduced Pauli susceptibility and Sommerfeld coefficient in the doped samples. Moreover, the second magnetization peak in the isothermal magnetization scan (`fishtail') which was very prominent in the magnetization data of the undoped crystal is suppressed in the doped samples. The temperature dependence of resistivity of the doped crystals show a remarkably different behavior from that of the undoped crystal with the appearance of a minima at lower temperatures, the position of which is fairly constant at different fields. Our data supports the notion that Iridium, which is a bigger atom than Rhodium expands the lattice thereby, reduces the electron correlations that existed due to the interaction between closer lying Rhodium atoms in the undoped system.

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