Charge-density-wave superconductorBi2Rh3Se2

Abstract

We discovered a superconducting transition with the charge-density-wave state in a ternary compound ${\mathrm{Bi}}_{2}{\mathrm{Rh}}_{3}{\mathrm{Se}}_{2}$. This compound crystallizes in the parkerite-type structure composed of sheets containing one-dimensional Rh-Rh chains. The electrical resistivity, magnetic susceptibility, thermoelectric power, sample length change, and x-ray diffraction measurements reveal that this compound is in the CDW state below $240\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. Furthermore, the specific heat and electrical resistivity measurements show a superconducting transition at $\ensuremath{\sim}0.7\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The various superconducting parameters were determined, and the GL parameter $\ensuremath{\kappa}(0)$ shows the considerably large value of 151 indicating an extreme type-II superconductor.