Multiple phase transitions in rare earth R5T4M10(T=Rh(T=Rh, Ir and M=Si,Ge,SnM=Si,Ge,Sn)

Rare earth compounds of the type R5T4M10 (T=RhT=Rh, Ir and M=SiM=Si, Ge, Sn) display a variety of phase transitions ranging from charge density wave (CDW), local moment magnetism, antiferromagnetism in the heavy fermion state, superconductivity and giant positive magnetoresistance. In particular, R5 Ir4Si10(R=Dy–Lu)(R=Dy–Lu) compounds exhibit strong coupling CDW at high temperatures and superconductivity or magnetic ordering at low temperatures, while R5Rh4Ge10(R=Gd–Tm)(R=Gd–Tm) show multiple magnetic transitions with large magnetoresistance below the magnetic transitions. Finally, the light rare earth series R5T4Sn10(R=Ce,Pr,Nd,T=Rh,Ir)(R=Ce,Pr,Nd,T=Rh,Ir) display heavy fermion behavior (for Ce and Pr) and giant positive magnetoresistance (for Nd) at low temperatures.