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Transition from spin-density-wave to layered antiferromagnetic state induced by hydrogen as a test for the origin of spin-density waves in chromium
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
2009 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 80, no 17, 174418- p.Article in journal (Refereed) Published
Abstract [en]

Neutron scattering experiments of Cr/V(001) superlattices are discussed, which show that the incommensurate spin-density-wave (SDW) in thick Cr layers becomes suppressed when the V spacer layers are loaded with hydrogen. The hydrogen loading triggers a transition from the incommensurate SDW state to a commensurate antiferromagnetic state. Model Hamiltonian calculations are presented, which show that this transition is not connected with the nesting property of the Cr Fermi surface. Instead, the transition is a manifestation of the antiferromagnetic ground state of Cr, which is separated from the incommensurate SDW state by an energy barrier. Hydrogen is identified as an effective trigger for reducing the activation barrier, enabling the system to relax to the ground state.

Place, publisher, year, edition, pages
2009. Vol. 80, no 17, 174418- p.
Keyword [en]
antiferromagnetic materials, chromium, commensurate-incommensurate transformations, Fermi surface, ground states, hydrogen, magnetic multilayers, magnetic transitions, metallic superlattices, neutron diffraction, spin density waves, spin Hamiltonians, vanadium
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-127386DOI: 10.1103/PhysRevB.80.174418ISI: 000272310400062OAI: oai:DiVA.org:uu-127386DiVA: diva2:329772
Available from: 2010-07-13 Created: 2010-07-13 Last updated: 2012-03-07Bibliographically approved

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