Spin-flop transition driven by competing magnetoelastic anisotropy terms in a spin-spiral antiferromagnet
Resumen: Holmium, the archetypical system for spin-spiral antiferromagnetism, undergoes an in-plane spin-flop transition earlier attributed to competing symmetry-breaking and fully symmetric magnetoelastic anisotropy terms [Phys. Rev. Lett. 94, 227204 (2005)], which underlines the emergence of sixfold magnetoelastic constants in heavy rare earth metals, as otherwise later studies suggested. A model that encompasses magnetoelastic contributions to the in-plane sixfold magnetic anisotropy is laid out to elucidate the mechanism behind the spin-flop transition. The model, which is tested in a Ho-based superlattice, shows that the interplay between competing fully symmetric a-magnetoelastic and symmetry-breaking ¿-magnetoelastic anisotropy terms triggers the spin reorientation. This also unveils the dominant role played by the sixfold exchange magnetostriction constant, where D66a2¿0.32 GPa against its crystal-field counterpart M66a2¿-0.2 GPa, in contrast to the crystal-field origin of the symmetry-breaking magnetostriction in rare earth metals.
Idioma: Inglés
DOI: 10.1103/PhysRevB.91.214428
Año: 2015
Publicado en: PHYSICAL REVIEW B 91, 21 (2015), 214428
ISSN: 1098-0121

Factor impacto JCR: 3.718 (2015)
Categ. JCR: PHYSICS, CONDENSED MATTER rank: 16 / 67 = 0.239 (2015) - Q1 - T1
Factor impacto SCIMAGO:

Tipo y forma: Article (Published version)

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