Electron spin resonance and magnetic characterization of the Gd{sub 5.09}Ge{sub 2.03}Si{sub 1.88}

Journal Article · Thu Dec 01 00:00:00 EST 2005 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.72.2· OSTI ID:20787759

Pires, M J.M.; Carvalho, A Magnus G.; Gama, S; Silva, E.C. da; Coelho, A A; Mansanares, A M ^[1]

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1. Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas, Unicamp, Cx. P. 6165, 13083-970, Campinas, Sao Paulo (Brazil)

Electron spin resonance was applied on samples of Gd{sub 5.09}Ge{sub 2.03}Si{sub 1.88}. The results are discussed under the scope of magnetization measurements, optical metallography, and wavelength dispersive spectroscopy. Polycrystalline arc-melted samples submitted to different heat treatments were investigated. The correlation of the electron spin resonance and magnetization results permitted a characterization of the present phases and their transitions. Two coexisting phases in the temperature range between two phase transitions have been identified and associated to distinct crystallographic phases. Additionally, the magnetic moment at high temperatures has been estimated from the measured effective g factor. A peak value of 21.5 J/kg K for the magnetocaloric effect was obtained for a sample heat treated at 1500 deg. C for 16 h.

• OSTI ID: 20787759
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 72, Issue 22; Other Information: DOI: 10.1103/PhysRevB.72.224435; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CORRELATIONS
ELECTRON SPIN RESONANCE
GADOLINIUM ALLOYS
GERMANIUM ALLOYS
HEAT TREATMENTS
LANDE FACTOR
MAGNETIC MOMENTS
MAGNETIZATION
PARAMAGNETISM
PHASE TRANSFORMATIONS
POLYCRYSTALS
SILICON ALLOYS
SPECTROSCOPY
WAVELENGTHS