|
|||||
|
|
Magnetic and structural instabilities in the hexagonal Laves hydride ErMn2H4.6 under high-pressure |
|
| Authors: | OL Makarova IN Goncharenko T Le Bihan |
| Institution: | a Russian Research Center, ‘Kurchatov Institute’, 1 Kurchatov sq., 123182 Moscow, Russia b Laboratoire Léon Brillouin, C.E.A.-C.N.R.S., CE Saclay, 91191 Gif sur Yvette, France c LACM, Université de Reims Champagne-Ardenne, UFR Science, 51100 Reims, France d European Synchrotron Research Facility, B.P. 220, 38042 Grenoble, France |
| Abstract: | The structural and magnetic properties of ErMn2H4.6 have been studied by X-ray and neutron diffraction up to the pressures of 15 and 6 GPa, respectively. In the pressure range 0<P<3 GPa we observe a first-order phase transition to new high-pressure (HP) phase. The HP phase has the same hexagonal unit cell as the ambient-pressure phase but smaller lattice parameters (ΔV/V=−5%). The structural transition results in suppression of the long-range antiferromagnetic order. Our results suggest that pressure changes positions of the hydrogen atoms in the metal host. We speculate that the new arrangement of hydrogen atoms induces spin frustration and, therefore, suppresses long-range magnetic order in the HP phase. |
| Keywords: | 61 10 Nz 61 12 Ld 62 50 +p 75 25 +z 75 50 Ee |
| 本文献已被 ScienceDirect 等数据库收录！ | |