Phonon and magnon scattering of antiferromagnetic Bi2Fe4O9
Iliev, M. N. (University of Houston. Texas Center for Superconductivity)
Litvinchuk, A. P. (University of Houston. Texas Center for Superconductivity)
Hadjiev, V. G. (University of Houston. Texas Center for Superconductivity)
Gospodinov, M. (Institut po fizika na tvŭrdoto ti︠a︡lo (Bŭlgarska akademii︠a︡ na naukite))
Skumryev, Vassil (Universitat Autònoma de Barcelona. Departament de Física)
Ressouche, Eric (Commissariat à l'Énergie Atomique et aux Énergies Alternatives (França))

Date:	2010
Abstract:	The phonon structure of antiferromagnetic Bi2Fe4O9 (space group Pbnm No. 55, TN≈240  K) was studied theoretically by calculations of lattice dynamics and experimentally between 10 and 300 K by polarized Raman spectroscopy. Most of the 12Ag+12B1g+9B2g+9B3g Raman modes were unambiguously identified. Strong second-order scattering was observed for ab-plane-confined incident and scattered light polarizations. In addition to the phonon-scattering, broad Raman bands with typical characteristics of magnon scattering appear below TN. The magnon bands are analyzed on the basis of magnetic structure of Bi2Fe4O9 and attributed to two- magnon excitations.
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Language:	Anglès
Document:	Article ; Versió publicada
Subject:	Física de l'estat sòlid
Published in:	Physical review B : condensed matter and materials physics, Vol. 81, N. 2 (Jan. 2010) , p. 24302, ISSN 1098-0121

DOI: 10.1103/PhysRevB.81.024302

8 p, 783.4 KB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Group of Smart Nanoengineered Materials, Nanomechanics and Nanomagnetism (Gnm3)
Articles > Published articles