Lattice dynamics in perovskite-type layer structures. I. FIR and Raman studies on K2MnF4and Rb2MnCl4

Burger, Harald; Strobel, K.; Geick, R.; Müller‐Lierheim, W.

doi:10.1088/0022-3719/9/23/006

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1978

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Cited by 31 publications

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“…at 186 K from the 01 (Pm3m) to Dl' (14/mcm) [48,49] and at 91.5 K from Dl' to Dl (P4/mbm) symmetry [61,62]. The related compounds K2MnF4 and Rb2MnC'4 have perovskite type layered structure with the Dl' (14/mmm) symmorphic group symmetry [63,64], (see Fig. 6).…”

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confidence: 98%

Selection rules for the double space group O1h

1978

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confidence: 98%

Selection rules for the double space group O1h

1978

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FIR spectroscopy study of the first-order phase transition of (CH3CH2NH3)2CdCl4

Peyrard

Perret

1979

Phys. Stat. Sol. (a)

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The temperature dependence of the far infrared reflectivity of the layer compound (CH3CH2NH3)2·CdCl4 are investigated from 120 to 300 K. Only small frequency shifts are observed at the order disorder OLT‐ORT phase transition, but some normal modes are drastically broadened. The line broadening results are compared to the X‐ray investigation data on the disordered motions in the ORT phase. The anisotropy of the observed line broadening effects reproduces the thermal motions anisotropy and consequently it is proposed to explain this broadening by the disorder effects. The mechanisms connecting the motions of the ethyl‐ammonium chains and the linewidths are discussed and a comparison with NMR results suggests that the disorder may play a dynamical role in the line broadening.

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Optical absorption of the layer antiferromagnet Rb₂MnCl₄

Попов

Kotlyarskii

1979

Physica Status Solidi (b)

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The optical absorption spectrum of the quasi-two-dimensional (2D) antiferromagnet RbtMnCI, is investigated in the region of the sAlg -+ 4Tzg(4D) transition (D group bands). It is found that short-range magnetic order strongly influences the absorption spectrum at temperatures T > T,.The spin-flop phase transition is observedin a magnetic field of 56 kOe. Investigation of theZeeman effect allows to conclude the spectrum in this region to consist of magnon and magnon-phonon sidebands of three different purely excitonic lines.

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Lattice dynamics in perovskite-type layer structures. I. FIR and Raman studies on K₂MnF₄and Rb₂MnCl₄

Cited by 31 publications

References 16 publications

Selection rules for the double space group O1h

Selection rules for the double space group O1h

FIR spectroscopy study of the first-order phase transition of (CH3CH2NH3)2CdCl4

Optical absorption of the layer antiferromagnet Rb₂MnCl₄

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Lattice dynamics in perovskite-type layer structures. I. FIR and Raman studies on K2MnF4and Rb2MnCl4

Cited by 31 publications

References 16 publications

Selection rules for the double space group O1h

Selection rules for the double space group O1h

FIR spectroscopy study of the first-order phase transition of (CH3CH2NH3)2CdCl4

Optical absorption of the layer antiferromagnet Rb2MnCl4

Contact Info

Product

Resources

About

Lattice dynamics in perovskite-type layer structures. I. FIR and Raman studies on K₂MnF₄and Rb₂MnCl₄

Optical absorption of the layer antiferromagnet Rb₂MnCl₄