Relationship of magnetic ordering and crystal structure in lanthanide ferromagnets Gd, Dy, and Ho at high pressures
The ferromagnetism of lanthanoid metals is modified when the crystal structure changes. All 4f lanthanide ferromagnets, from Gd to Tm, have an hcp structure at ambient pressure, and exhibit the structural transformations in the sequence hcp -> Sm-type -> double-hcp (dhcp) -> fcc -> trigonal under pressure. The magnetic structures determined by neutron diffraction experiments performed in Tb are in agreement with our high sensitivity a.c. magnetization experiments. However, it is not the case for the Dy, Ho and Gd compounds. In order to shed light in this discrepancy, we propose to perform neutron powder diffraction experiments in Dy, Ho and Gd - by using the 160Gd and 160Dy isotopes for which the neutron absorption will not be a major problem- at high pressures (P < 100kbar). To accomplish the experiment, we apply for 3 beamtime days at the D20 instrument in its maximum flux configuration
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J Campo; Claire V. Colin; COVA Federico Hector; Thomas C. Hansen; LALIENA Victor; LUZON Javier; NASSIF Vivian; Miguel Pardo-Sainz; PIQUER Cristina; PUENTE ORENCH Ines and RODRIGUEZ VELAMAZAN Jose Alberto. (2021). Relationship of magnetic ordering and crystal structure in lanthanide ferromagnets Gd, Dy, and Ho at high pressures. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2858
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