Magnetism in UCo_{0.88}Ru_{0.12}Ge Studied by Polarized Neutrons

• Authors: M. Vališka , J. Pospíšil , G. Nénert , A. Stunault , K. Prokeš , V. Sechovský
• Languages of publication: EN

Abstracts

EN

UCoGe is an archetype of coexisting weak itinerant 5f-electron ferromagnetism (T_{C}~3 K, μ_{s}=0.03μ_{B}/f.u.) and superconductivity (T_{SC}~ 0.6 K) at ambient pressure. The Ru substitution for Co leads to an initial sharp increase of the T_{C} up to the maximum of T_{C}=8.5 K for x=0.12, increase of spontaneous magnetic moment and suppression of superconductivity. We have grown the UCo_{0.88}Ru_{0.12}Ge single crystal and studied magnetization along the principal crystallographic axes. To see the microscopic background of these findings we performed a polarized neutron diffraction experiment on D3 diffractometer in ILL. We have found that the Co and U moments are parallel in UCo_{0.88}Ru_{0.12}Ge, in contrast to the antiparallel configuration in UCoGe. This is probably the reason of the spontaneous magnetization increase with Ru doping.

Keywords

EN

74.70.Tx; 61.05.fm; 75.25.-j

Discipline

• 61.05.fm: Neutron diffraction
• 74.70.Tx: Heavy-fermion superconductors(for heavy-fermion systems in magnetically ordered materials, see 75.30.Mb; see also 71.27.+a Strongly correlated electron systems, heavy fermions)
• 75.25.-j: Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)(for devices exploiting spin polarized transport, see 85.75.-d)

• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 126
• Issue: 1
• Pages: 330-331

Dates

published

2014-07

Contributors

author

M. Vališka

• Faculty of Mathematics and Physics, Charles University, DCMP, Ke Karlovu 5, CZ-12116 Praha 2, Czech Republic

author

J. Pospíšil

• Faculty of Mathematics and Physics, Charles University, DCMP, Ke Karlovu 5, CZ-12116 Praha 2, Czech Republic

author

G. Nénert

• Institut Laue Langevin, 6 rue Jules Horowitz, 38042 Grenoble, France

author

A. Stunault

• Institut Laue Langevin, 6 rue Jules Horowitz, 38042 Grenoble, France

author

K. Prokeš

• HZB Berlin, Hahn-Meitner Platz 1 14109 Berlin, Germany

author

V. Sechovský

• Faculty of Mathematics and Physics, Charles University, DCMP, Ke Karlovu 5, CZ-12116 Praha 2, Czech Republic

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Identifiers

DOI

10.12693/APhysPolA.126.330