Journal Article

FZJ-2013-00937

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Magnetic ordering in double perovskites R$_2$CoMnO$_6$ (R = Y, Tb) investigated by high resolution neutron spectroscopy.

Chatterji, T. ; Frick, B. ; Nair, H.FZJ*

2012
IOP Publ. Bristol

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Please use a persistent id in citations: http://hdl.handle.net/2128/23000  doi:10.1088/0953-8984/24/26/266005

Abstract: We have investigated low energy nuclear spin excitations in double perovskite compounds R(2)CoMnO(6) (R=Y, Tb) by inelastic neutron scattering with a high resolution back-scattering spectrometer. We observed inelastic signals at about 2.1 μeV for Y(2)CoMnO(6) and also for Tb(2)CoMnO(6) at T = 2 K in both energy-loss and energy-gain sides. We interpret these inelastic peaks to be due to the transitions between the hyperfine split nuclear levels of the (59)Co nucleus. The inelastic peaks move towards the central elastic peak and finally merge with it at the magnetic ordering temperature T(C). The energy of the low energy excitations decreases continuously and becomes zero at T(C) ≈ 75 K for Y(2)CoMnO(6) and T(C) ≈ 100 K for Tb(2)CoMnO(6). For Tb(2)CoMnO(6), which contains magnetic rare earth ions, additional quasielastic scattering due presumably to the fluctuations of large Tb magnetic moments was observed. The present study reveals the magnetic ordering of the Co sublattice. The results of this investigation along with that obtained by us for other compounds indicate the presence of unquenched orbital moments in some of the Co compounds.

Keyword(s): Basic research (1st) ; Others (1st) ; Information Technology and Functional Materials (1st) ; Magnetism (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS (München) ; Jülich Centre for Neutron Science JCNS (München) ; JCNS-FRM-II)
2. Streumethoden (PGI-4)
3. Streumethoden (JCNS-2)

Research Program(s):

1. 422 - Spin-based and quantum information (POF2-422) (POF2-422)
2. 424 - Exploratory materials and phenomena (POF2-424) (POF2-424)
3. 542 - Neutrons (POF2-542) (POF2-542)
4. 544 - In-house Research with PNI (POF2-544) (POF2-544)
5. 54G - JCNS (POF2-54G24) (POF2-54G24)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2012

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Database coverage:
; ; Current Contents - Social and Behavioral Sciences ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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