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)

• Publisher: Institute of Physics, Polish Academy of Sciences
• 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

References

• [1] R. Troc, V.H. Tran, J. Magn. Magn. Mater. 73, 389 (1988), doi: 10.1016/0304-8853(88)90107-2
• [2] K.H.J. Buschow, E. Bruck, R.G. van Wierst, F.R. de Boer, L. Havela, V. Sechovsky, P. Nozar, E. Sugiura, M. Ono, M. Date, A. Yamagishi, J. Appl. Phys. 67, 5215 (1990), doi: 10.1063/1.344641
• [3] N.T. Huy, A. Gasparini, D.E. de Nijs, Y. Huang, J.C.P. Klaasse, T. Gortenmulder, A. de Visser, A. Hamann, T. Gorlach, H. von Lohneysen, Phys. Rev. Lett. 99, 067006 (2007), doi: 10.1103/PhysRevLett.99.067006
• [4] M. Divis, Physica B: Condensed Matter 403, 2505 (2008), doi: 10.1016/j.physb.2008.01.014
• [5] M. Samsel-Czekala, S. Elgazzar, P.M. Oppeneer, E. Talik, W. Walerczyk, R. Troc, J. Phys.: Condens. Matter 22, 015503 (2010), doi: 10.1088/0953-8984/22/1/015503
• [6] P. de la Mora, O. Navarro, J. Phys.: Condens. Matter 20, 285221 (2008), doi: 10.1088/0953-8984/20/28/285221
• [7] K. Prokes, A. de Visser, Y.K. Huang, B. Fak, E. Ressouche, Phys. Rev. B 81, 180407R (2010), doi: 10.1103/PhysRevB.81.180407
• [8] J. Pospisil, J.P. Vejpravova, M. Divis, V. Sechovsky, J. Appl. Phys. 105, 07E114 (2009), doi: 10.1063/1.3062954
• [9] K. Huang, J.J. Hamlin, R.E. Baumbach, M. Janoschek, N. Kanchanavatee, D.A. Zocco, F. Ronning, M.B. Maple, Phys. Rev. B 87, 054513 (2013), doi: 10.1103/PhysRevB.87.054513
• [10] K. Uhlirova, M. Divis, J. Pospisil, S. Danis, V. Sechovsky, J. Phys. Soc. Jpn. 81, 094703 (2012), doi: 10.1143/JPSJ.81.094703

Identifiers

DOI

10.12693/APhysPolA.126.330