Journal Article

PreJuSER-23058

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Griffiths phase-like behavior and spin-phonon coupling in double perovskite Tb2NiMnO6

Nair, H.FZJ* ; Swain, D. ; Hariharan, N. ; Adiga, S.FZJ* ; Narayana, C. ; Elzabeth, S.

2011
American Institute of Physics Melville, NY

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Please use a persistent id in citations: http://hdl.handle.net/2128/7608  doi:10.1063/1.3671674

Abstract: The Griffiths phase-like features and the spin-phonon coupling effects observed in Tb2NiMnO6 are reported. The double perovskite compound crystallizes in monoclinic P2(1)/n space group and exhibits a magnetic phase transition at T-c similar to 111 K as an abrupt change in magnetization. A negative deviation from ideal Curie-Weiss law exhibited by 1/chi(T) curves and less-than-unity susceptibility exponents from the power-law analysis of inverse susceptibility are reminiscent of Griffiths phase-like features. Arrott plots derived from magnetization isotherms support the inhomogeneous nature of magnetism in this material. The observed effects originate from antiferromagnetic interactions that arise from inherent disorder in the system. Raman scattering experiments display no magnetic-order-induced phonon renormalization below Tc in Tb2NiMnO6, which is different from the results observed in other double perovskites and is correlated to the smaller size of the rare earth. The temperature evolution of full-width-at-half-maximum for the stretching mode at 645 cm(-1) presents an anomaly that coincides with the magnetic transition temperature and signals a close connection between magnetism and lattice in this material. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3671674]

Keyword(s): Basic research (1st) ; Others (1st) ; Magnetism (2nd) ; J

Note: S.E. wishes to thank Department of Science and Technology, India, for financial support through project grants.

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Contributing Institute(s):

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

Research Program(s):

1. Grundlagen für zukünftige Informationstechnologien (FUEK412) (FUEK412)
2. 544 - In-house Research with PNI (POF2-544) (POF2-544)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2012

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Database coverage:
; ; ; Allianz-Lizenz / DFG ; 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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