Observation of a Griffiths-like Phase in the Magnetocaloric Compound Tb{sub 5}Si{sub 2}Ge{sub 2}

Journal Article · Fri Apr 28 00:00:00 EDT 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.96.167201· OSTI ID:20777174

Magen, C; Algarabel, P A; Morellon, L; Ibarra, M R ^[1]; Araujo, J P; Pereira, A M; Sousa, J B ^[2]; Ritter, C ^[3]

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1. Instituto de Ciencia de Materiales de Aragon, Universidad de Zaragoza and Consejo Superior de Investigaciones Cientificas, 50009 Zaragoza (Spain)
2. IFIMUP and Physics Department of FCUP, University of Porto, R. Campo Alegre 687, Porto 4169-007 (Portugal)
3. Institut Laue-Langevin, Boite Postale 156, 38042 Grenoble Cedex 9 (France)

The onset of a Griffiths-like phase has been observed in Tb{sub 5}Si{sub 2}Ge{sub 2} (T{sub C}=110 K) by means of magnetic susceptibility and small-angle neutron scattering experiments. We show the growth of a ferromagnetic cluster system characterized by an inverse susceptibility exponent lower than unity at T{sub C}<T<T{sub G}{approx_equal}200 K. We suggest that the Griffiths-like state is originated by local disorder within the crystallographic structure, stabilized and enhanced by competing intralayer and interlayer magnetic interactions. Both factors thus promote segregation of nanometric regions with ferromagnetic interactions.

• OSTI ID: 20777174
• Journal Information: Physical Review Letters, Vol. 96, Issue 16; Other Information: DOI: 10.1103/PhysRevLett.96.167201; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRITICAL TEMPERATURE
CRYSTAL GROWTH
CRYSTALLOGRAPHY
FERROMAGNETIC MATERIALS
GERMANIUM ALLOYS
MAGNETIC SUSCEPTIBILITY
NEUTRON DIFFRACTION
SEGREGATION
SILICON ALLOYS
SMALL ANGLE SCATTERING
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K
TERBIUM ALLOYS
TERNARY ALLOY SYSTEMS