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The correlated electron effects in rare earth compound produce various interesting ground state properties. Two of such grounds states are charge density wave (CDW) and Superconductivity (SC). Recently, few of the Arsenide and Selenide compounds have been found to have charge density wave transitions at high temperature which when suppressed evolves to superconductivity at low temperatures. The entanglement of these two effects was found to be profound. Lu2Ir3Si5 is one of such compounds in which the CDW transition occurs at 200 K along with the SC at 3.5 K. Even though Lu2Ir3Si5 has a three dimensional crystal structure, it is reported that one observes both SC and CDW transition in this compound, which is very unusual as CDW are commonly observed in low dimensional materials. In this talk, I shall first introduce the coexistence of CDW and SC in Lu2Ir3Si5. Then, the evolution of CDW and SC and their influence on each other, in substituted compounds viz (Lu1-xScx)2Ir3Si5, Lu2(Ir1-xRhx)3Si5 and Lu2Ir3(Si1-xGex)5, shall be described. A non-monotonicity of the transition temperatures for the CDW and SC orderings, as a function of Ge doping has been a new and important observation in Lu2Ir3Si5. Finally, the coexistence of CDW and SC in single crystals of Lu2Ir3Si5 shall be presented. In comparison to polycrystalline sample of Lu2Ir3Si5, multiple charge density wave (CDW) transitions are observed in all the measurements on single crystal of Lu2Ir3Si5.
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