Itinerant and local magnetism,superconductivity and mixed valency phenomena in RM2Si2, (R = rare earth,M = Rh,Ru)° |
| |
Authors: | Israel Felner Israel Nowik |
| |
Institution: | Racah Institute of Physics, Hebrew University, Jerusalem, Israel |
| |
Abstract: | X-Ray, magnetization and Mossbauer (151Eu, 155Gd, 161Dy and dilute 57Fe) studies of RM2Si2 reveal that when R is a magnetic ion the compounds order antiferromagnetically. For M = Rh a second antiferromagnetic phase transition is observed, corresponding to Rh itinerant electron magnetic ordering. In EuRh2Si2 the Eu ion is predominantly divalent with a mixed valent component. In EuRu2Si2 the Eu is predominantly trivalent. LaRu2Si2 and LuRu2Si2 display enhanced electron paramagnetism and become superconducting at 3.5 K and 2.4 K respectively. LaRh2Si2, YRh2Si2 and LuRh2Si2 display an itinerant electron magnetic phase transition, TM (LaRh2Si2) = 7 K, and at lower temperatures a superconducting phase transition, Tc(LaRh2Si2) = 3.8 K. There is evidence that in the superconducting phase the itinerant magnetic order survives. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|