Magnetism and superconductivity driven by identical 4f states in a heavy-fermion metal.
The apparently inimical relationship between magnetism and superconductivity has come under increasing scrutiny in a wide range of material classes, where the free energy landscape conspires to bring them in close proximity to each other. Particularly enigmatic is the case when these phases microscopically interpenetrate, though the manner in which this can be accomplished remains to be fully comprehended. Here, we present combined measurements of elastic neutron scattering, magnetotransport, and heat capacity on a prototypical heavy fermion system, in which antiferromagnetism and superconductivity are observed. Monitoring the response of these states to the presence of the other, as well as to external thermal and magnetic perturbations, points to the possibility that they emerge from different parts of the Fermi surface. Therefore, a single 4f state could be both localized and itinerant, thus accounting for the coexistence of magnetism and superconductivity.
Nair
Sunil
S
Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden, Germany.
Stockert
O
O
Witte
U
U
Nicklas
M
M
Schedler
R
R
Kiefer
K
K
Thompson
J D
JD
Bianchi
A D
AD
Fisk
Z
Z
Wirth
S
S
Steglich
F
F
Phys Rev B Condens Matter. 1988 Feb 1;37(4):1510-1519
9944668
Nature. 2008 Apr 17;452(7189):859-63
18421350
Nature. 2004 Jun 3;429(6991):531-4
15175744
Phys Rev Lett. 2006 Aug 4;97(5):056404
17026124
Phys Rev Lett. 2008 Feb 29;100(8):087001
18352656
Phys Rev Lett. 2008 Jul 18;101(3):037001
18764281
Phys Rev Lett. 2007 Oct 5;99(14):146402
17930691
Science. 2008 Sep 19;321(5896):1652-4
18719250
Phys Rev Lett. 2003 Oct 31;91(18):187004
14611309
Phys Rev Lett. 2007 Mar 16;98(11):117206
17501089
Nature. 2001 Mar 15;410(6826):340-3
11268203