Neutron diffraction studies on heavy fermion superconducting and antiferromagnetic compounds CeRh1-xCoxIn5

✍ Scribed by Ohira-Kawamura, Seiko ;Kawano-Furukawa, Hazuki ;Shishido, Hiroaki ;Okazaki, Ryuji ;Shibauchi, Takasada ;Harima, Hisatomo ;Matsuda, Yuji

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 732 KB
• Volume: 206
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200881222

✦ Synopsis

Abstract

CeCoIn~5~ is a heavy fermion superconductor with the transition temperature T~c~ = 2.3 K, while in a related material CeRhIn~5~ the superconductivity is highly suppressed and an incommensurate antiferromagnetic (AFM) order characterized by the propagation vector q~h~ = (1/2, 1/2, 0.297) appears below T~N~ = 3.8 K. From the elastic neutron diffraction measurements on mixed compounds CeRh~1–x~ Co__~x~__ In~5~, it was found that the superconductivity is strongly suppressed by the incommensurate AFM order while it coexists with the commensurate AFM order with q~c~ = (1/2, 1/2, 1/2) in the intermediate x region. This is in sharp contrast to the CeRh~1–x~ Ir__~x~__ In~5~ system, where both the commensurate and incommensurate AFM orders coexist with the superconductivity. These results reveal that particular areas on the Fermi surface nested by q~h~ play an active role in forming the superconducting state in CeCoIn~5~. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)