Interplay of magnetic and hydrogen orders in the laves hydride YMn{sub 2}H{sub 4.3}

Journal Article · Fri Aug 01 04:00:00 EDT 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.56.2580· OSTI ID:528074

Goncharenko, I N ^[1]; Mirebeau, I ^[1]; Irodova, A V ^[2]; Suard, E ^[3]

---

1. Laboratoire Leon Brillouin, CEA-CNRS, CEA/Saclay, 91191 Gif sur Yvette (France)
2. Russian Research Center Kurchatov Institut, 123182 Moscow (Russia)
3. Institut Laue-Langevin, 156X, 38042 Grenoble (France)

We have performed a neutron-diffraction study of the Laves hydride YMn{sub 2}H{sub 4.3} to investigate the interplay between the atomic order in the hydrogen sublattice and the magnetic structure. We find that structural order in the H sublattice and antiferromagnetic order in the Mn sublattice have the same rhombohedral symmetry. At ambient pressure we observe a first-order magnetostructural transition, where the magnetic sublattice transforms from a paramagnetic state to an antiferromagnetic one, as the hydrogen atoms form the ordered superstructure. An applied pressure decouples the two types of order, which then occur at different temperatures. It allows us to separate the effects of structural order from those related to the average Mn-Mn distance. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 528074
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 5 Vol. 56; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANTIFERROMAGNETIC MATERIALS
CRYSTAL STRUCTURE
LAYERS
MAGNETIC PROPERTIES
MANGANESE HYDRIDES
NEUTRON DIFFRACTION
PARAMAGNETISM
PHASE TRANSFORMATIONS
YTTRIUM HYDRIDES