A possible explanation of meta-magnetic transition in CeRu2Si2 and magnetic behavior in Gd-poor (Ce-Gd)Ru2Si2

K Yano,K Sato,Y Amakai,Y Hara,E Kita,T Ohta,H Takano,S Murayama

doi:10.1063/1.5042853

Abstract

Aiming at getting any clue to the mechanism of characteristic behavior of meta-magnetic transition in CeRu2Si2 and the Ce 4f electronic states in Gd-poor contents, the (Ce-Gd)Ru2Si2 crystal mixed system was studied through magnetic measurements. A characteristic behavior of meta-magnetic transition observed in CeRu2Si2 was found to be reproduced in GdRu2Si2 in the temperature range between 30 K and 40 K. The meta-magnetic transition field was increased to higher field by the substitution of small amount of Gd contents of 0.01 and 0.02 at%. Furthermore, the reciprocal susceptibility in CeRu2Si2 (Gd=0) in temperature range between 15 K and 300 K revealed that the electronic state of Ce 4f was dominantly Ce3+, which was in accordance with a previous work, and the electronic states of Ce 4f in CeRu2Si2 could be described by the Van Vleck paramagnetic picture.

Highlights

It is well known that the Ce122 systems have been one of the most extensively studied heavy fermion materials and various interesting properties including superconductivity have been revealed depending on the electronic states of Ce.[1,2]
CeRu2Ge2 where Si is replaced by Ge shows a clear ferro-magnetic behavior with Curie temperature T c of 7.9 K2 and many substituted systems such as CeRu2(Si-Ge)[2,4] and Ce(Ru-Rh)2Si25,6 have been investigated in detail and interesting results have been obtained
One of the representatives was carried out using de Haas van Alphen effect and it was suggested that the Ce 4f electron(s) can vary from aCorresponding author; E-mail: kyano@phys.ge.cst.nihon-u.ac.jp

Summary

Introduction

It is well known that the Ce122 systems have been one of the most extensively studied heavy fermion materials and various interesting properties including superconductivity have been revealed depending on the electronic states of Ce.[1,2] the Ce 122 systems have attracted many researchers for long time and remain to be one of the main topics at present.

Results

Conclusion