Neutron diffraction study of the non-Fermi liquid compound CeNiGa2: magnetic behaviour as a function of pressure and temperature

Vincent Legrand (1) , Winfried Kockelmann (2) , Christopher D Frost (2) , Robert Hauser (3) , Dariusz Kaczorowski (4)

1 E3M - État Mécanique et Microstructure des Matériaux
2 RAL - STFC Rutherford Appleton Laboratory
3 TU Wien - Vienna University of Technology = Technische Universität Wien
4 Institute of Low Temperature and Structure Research [Polish Academy of Sciences]

The magnetic symmetry and structure of the non-Fermi liquid heavy fermion compound CeNiGa2 has been determined by neutron powder diffraction. The orthorhombic CeNiGa2 compound orders antiferromagnetically below 4.4(2) K at ambient pressure with a magnetic moment magnitude of mu(Ce) = 0.80(4) mu(B) for moments aligned along the c-axis. The magnetic (Shubnikov) space group is C(2c)m'm'm. The nature of the magnetic order of CeNiGa2 is further elucidated by neutron diffraction at elevated pressures up to 4.5 kbar, allowing for the confirmation of a critical pressure P-C of about 4.2(2) kbar above which the magnetic moment ordering is suppressed.

Domaines: Mécanique [physics.med-ph]; Matériaux

Vincent Legrand, Winfried Kockelmann, Christopher D Frost, Robert Hauser, Dariusz Kaczorowski. Neutron diffraction study of the non-Fermi liquid compound CeNiGa2: magnetic behaviour as a function of pressure and temperature. Journal of Physics: Condensed Matter, 2013, 25 (20), ⟨10.1088/0953-8984/25/20/206001⟩. ⟨hal-01007102⟩