Lattice and magnetic dynamics of a quasi-one-dimensional chain antiferromagnet PbFeBO 4

A group of recently synthesized orthorhombic Pnma crystals PbMBO (M  =  Cr, Mn, Fe) demonstrates a number of unusual structural and magnetic properties. We report on polarized Raman scattering study of the lattice and magnetic dynamics in single crystals of an antiferromagnet PbFeBO below and above...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2017-01, Vol.29 (2), p.025808
Main Authors: Prosnikov, M A, Smirnov, A N, Yu Davydov, V, Sablina, K A, Pisarev, R V
Format: Article
Language:English
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Summary:A group of recently synthesized orthorhombic Pnma crystals PbMBO (M  =  Cr, Mn, Fe) demonstrates a number of unusual structural and magnetic properties. We report on polarized Raman scattering study of the lattice and magnetic dynamics in single crystals of an antiferromagnet PbFeBO below and above [Formula: see text] K. Polarization properties of the observed magnetic excitations below T as well as intense quasi-elastic scattering support the quasi-one-dimensional character of the magnetic structure of PbFeBO . Frequency overlapping of magnetic excitations and low-frequency phonons in the range of 90-200 cm leads to pronounced asymmetric anomalies thus confirming intrinsic coupling of magnetic and lattice subsystems. This conclusion is also supported by observation of anomalous temperature behaviour of higher frequency phonons in the vicinity of T . Experimental investigations are supported by relevant magnetic symmetry analysis which allows us to explain previously observed anomalous results.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/29/2/025808