Light scattering from phonons and magnons in CoCl<sub>2</sub> · 2H<sub>2</sub>O

Helms, Charles A.; Scott, J. F.; Toms, D. J.

doi:10.1002/jrs.1250080609

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J Raman Spectroscopy

1979

DOI: 10.1002/jrs.1250080609

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Light scattering from phonons and magnons in CoCl₂ · 2H₂O

Charles A. Helms

J. F. Scott

D. J. Toms

Abstract: A light scattering study of cobalt chloride dihydrate is reported. Emphasis is placed upon phonon-magnon interactions in the antiferromagnetic phase. Data taken at T = 1.6 K and magnetic fields from 0 to 5 T confirm the conclusion of Schneider and Weihel that the ferrimagnetic-antiferromagnetic phase transition is first-order and that a large hysteresis is observable at temperatures below 4.2 K.

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Cited by 3 publications

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Magnetoelastic waves and a group‐theoretical determination of selection rules for magnon—phonon interactions and two‐magnon Raman scattering in FeCl₂ · 2H₂O and CoCl₂ · 2H₂O

Cracknell

1979

J Raman Spectroscopy

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In this paper we deduce selection rules for magnon-phonon coupling at k = 0 and for lines of symmetry passing through k = 0 for the antiferromagnetic materials FeCI2.2H2O and CoC12.2H20. The results are tabulated. We also determine the symmetries of two-magnon states in these materials and deduce selection rules for the Raman activity of these states. It is found that all the two-magnon states are Raman active in each material, although there are some restrictions on the polarizations. INTRQDUCTIQNRecent experimental work on light-scattering by antiferromagnetic FeCI2.2H2O and CoC12-2HzO has been directed towards the study of magnon-phonon interactions in these two materials.'-3 In view of this it seemed to be of interest to study, from a grouptheoretical point of view, the determination of selection rules governing magnon-phonon coupling in these two materials. In this paper we shall consider the determination of selection rules for k = 0, which is the wave vector relevant to these light-scattering experiments, for one-magnon and two-magnon scattering processes. A preliminary account of some of these results, for FeC12.2H20 only, was presented at a recent conf e r e n~e .~The magnetic structures of these two materials are described by Narath.5*6 Both materials have the same crystallographic structure and they have the same division of magnetic atoms into two antiferromagnetic sublattices. However, the direction of the sublattice magnetization is different in the two materials. This is illustrated in Fig. 1 for FeC12.2Hz0 and in Fig. 2 for CoC12.2H20; in each case we show just one magnetic atom on each sublattice and the sublattice magnetization direction is indicated by S : and S:. MAGNETIC STRUCTURESThe labels we shall use for the symmetry operations of these structures are based on the tables of Miller and Love7 but are written as Seitz symbols via Appendix I of Bradley and Cracknell.' For both FeC12.2Hz0 and CoCl2.2H20 we identify the symmetry operations of the paramagnetic phase, space group A2/m (or C2/m), as(1) plus all the products of these operations with any translations of the Bravais lattice. The z-axis of Miller and Love's orientation corresponds to the b-axis in Narath's Figure 1. Local axes used for definition of spin operators in FeC12.2H,0; the sublattice magnetizations are along S: and S:.Figure 2. Local axes used for definition of spin operators in CoCI2.2H,O; the sublattice magnetizations are along S: and S:.

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Magnetoelastic waves and a group‐theoretical determination of selection rules for magnon—phonon interactions and two‐magnon Raman scattering in FeCl₂ · 2H₂O and CoCl₂ · 2H₂O

Cracknell

1979

J Raman Spectroscopy

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On the reststrahlen spectrum of yttrium iron garnet

Häussler

Falge

Brandmüller

1981

J Raman Spectroscopy

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Multiferroic magnetoelectric fluorides: why are there so many magnetic ferroelectrics?

Scott

Blinc

2011

J. Phys.: Condens. Matter

107

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Light scattering from phonons and magnons in CoCl₂ · 2H₂O

Cited by 3 publications

References 41 publications

Magnetoelastic waves and a group‐theoretical determination of selection rules for magnon—phonon interactions and two‐magnon Raman scattering in FeCl₂ · 2H₂O and CoCl₂ · 2H₂O

Magnetoelastic waves and a group‐theoretical determination of selection rules for magnon—phonon interactions and two‐magnon Raman scattering in FeCl₂ · 2H₂O and CoCl₂ · 2H₂O

On the reststrahlen spectrum of yttrium iron garnet

Multiferroic magnetoelectric fluorides: why are there so many magnetic ferroelectrics?

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Light scattering from phonons and magnons in CoCl2 · 2H2O

Cited by 3 publications

References 41 publications

Magnetoelastic waves and a group‐theoretical determination of selection rules for magnon—phonon interactions and two‐magnon Raman scattering in FeCl2 · 2H2O and CoCl2 · 2H2O

Magnetoelastic waves and a group‐theoretical determination of selection rules for magnon—phonon interactions and two‐magnon Raman scattering in FeCl2 · 2H2O and CoCl2 · 2H2O

On the reststrahlen spectrum of yttrium iron garnet

Multiferroic magnetoelectric fluorides: why are there so many magnetic ferroelectrics?

Contact Info

Product

Resources

About

Light scattering from phonons and magnons in CoCl₂ · 2H₂O

Magnetoelastic waves and a group‐theoretical determination of selection rules for magnon—phonon interactions and two‐magnon Raman scattering in FeCl₂ · 2H₂O and CoCl₂ · 2H₂O

Magnetoelastic waves and a group‐theoretical determination of selection rules for magnon—phonon interactions and two‐magnon Raman scattering in FeCl₂ · 2H₂O and CoCl₂ · 2H₂O