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Anisotropy of antiferromagnetic spin fluctuations in the heavy fermion superconductors of CeMIn5 and PuMGa5 (M=Co, Rh)

Published online by Cambridge University Press:  01 February 2011

Hironori Sakai ,
Shinsaku Kambe ,
Yo Tokunaga ,
Yoshinori Haga ,
Seung -H. Baek ,
Filip Ronning ,
Eric Bauer  and
Joe D Thompson
Hironori Sakai
Affiliation:
sakai.hironori@jaea.go.jp, Japan Atomic Energy Agency, Advanced Science Research Center, Tokai, Ibaraki, Japan
Shinsaku Kambe
Affiliation:
kambe.shinsaku@jaea.go.jp, Japan Atomic Energy Agency, Advanced Science Research Center, Tokai, Ibaraki, Japan
Yo Tokunaga
Affiliation:
tokunaga.yo@jaea.go.jp, Japan Atomic Energy Agency, Advanced Science Research Center, Tokai, Ibaraki, Japan
Yoshinori Haga
Affiliation:
haga.yoshinori@jaea.go.jp, Japan Atomic Energy Agency, Advanced Science Research Center, Tokai, Ibaraki, Japan
Seung -H. Baek
Affiliation:
sbaek.fu@gmail.com, Los Alamos National Laboratory, MPA-CMMS, Los Alamos, New Mexico, United States
Filip Ronning
Affiliation:
fronning@lanl.gov, Los Alamos National Laboratory, MPA-CMMS, Los Alamos, New Mexico, United States
Eric Bauer
Affiliation:
edbauer@lanl.gov, Los Alamos National Laboratory, MPA-CMMS, Los Alamos, New Mexico, United States
Joe D Thompson
Affiliation:
jdt@lanl.gov, Los Alamos National Laboratory, MPA-CMMS, Los Alamos, New Mexico, United States
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Abstract

The anisotropy of antiferromagnetic spin fluctuations has been investigated microscopically in the heavy fermion systems of CeMIn5 and PuMGa5 (M=Co, Rh) by means of nuclear magnetic resonance (NMR). Both systems are known to be relatively high-Tc superconductors among the heavy fermion systems, especially PuCoGa5, which has a Tc=18.5 K almost one order of magnitude larger than for CeCoIn5 ( Tc=2.3 K). Analysis of the Knight shift and spin-lattice relaxation rates suggests XY-type anisotropy in the antiferromagnetic spin fluctuations in the normal states of these unconventional superconductors. Moreover, the 115 superconductors with larger XY-type fluctuations have a higher Tc, compared to the anisotropy of spin fluctuations in the related paramagnetic system UFeGa5 and antiferromagnets UPtGa5, NpCoGa5, NpFeGa5.

Keywords

actinidesuperconductingnuclear magnetic resonance (NMR)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1264: Symposia Z/BB – Basic Actinide Science and Materials for Nuclear Applications , 2010 , 1264-Z12-01
Copyright
Copyright © Materials Research Society 2010

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