Suppression of the nuclear forward scattering signal in GdBaFe2O5 and PrBaFe2O5

Suppression of the nuclear forward scattering signal in GdBaFe2O5 and PrBaFe2O5

•Nuclear forward scattering (NFS) study of temperature-induced valence mixing in RBaFe2O5.•Intermittent suppression of the coherent decay-channel in NFS.•Coherence loss in NFS connected to intermittent loss of long-range order under the array of transitions. Antiferromagnetic double-cell perovskites...

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Veröffentlicht in:Physics letters. A 2021-11, Vol.416, p.127652-1-127652-4, Article 127652
Hauptverfasser: Lindroos, F., Slotte, J.M.K., Lindén, J., Chumakov, A.I., Karen, P.
Format: Artikel
Sprache:eng
Schlagworte:
Double perovskites
Intermittent suppression of coherent decay-channel
Mössbauer spectroscopy
Nuclear forward scattering
Physics
Valence mixing
Verwey transition
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Zusammenfassung:•Nuclear forward scattering (NFS) study of temperature-induced valence mixing in RBaFe2O5.•Intermittent suppression of the coherent decay-channel in NFS.•Coherence loss in NFS connected to intermittent loss of long-range order under the array of transitions. Antiferromagnetic double-cell perovskites GdBaFe2O5.004 and PrBaFe2O5.001 were studied with 14.4 keV 57Fe nuclear forward scattering (NFS). Both have charge- and orbital-ordered iron below a Verwey transition temperature TV and valence-mixed iron above a second transition at a higher Tp. At intermediate temperatures TV
ISSN:0375-9601
1873-2429
DOI:10.1016/j.physleta.2021.127652