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Temperature dependence of the electric field gradient generated by nearest-neighbor impurity atoms in cubic Ag metal

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Temperature dependence of the electric field gradient generated by nearest-neighbor impurity atoms in cubic Ag metal

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Título Temperature dependence of the electric field gradient generated by nearest-neighbor impurity atoms in cubic Ag metal
Autor Baumvol, Israel Jacob Rabin
Behar, Moni
Iglesias, Jose Roberto
Livi, Rogerio Pohlmann
Zawislak, Fernando Claudio
Abstract The electric quadrupole interactions produced by near-neighbor (nn) and distant-neighbor impurity atoms of Cu, Au, Zn, In, Ga, Al, Sn, and Sb in a cubic Ag lattice are measured as a function of the temperature by the time differential perturbed angular correlation method. The results show that both the high-frequency interaction vhQ-generated by nn impurities-and the low-frequency interaction v1Q- generated by distant impurities-follow the relation vQ(T) = vQ(O) (I -a T 312). From the present measurements it can be concluded that both coefficients, ∝h and ∝1 are strongly dependent on the mass M of the impurity. For the case of Al, Ga, and In impurities with the same charge difference ∆Z = 2 between host and impurity, both ∝h and ∝1 scale as M-n with n = 0.37 ±0.04 and n = 0.9 ±0.4, respectively. lt is shown that for a Sn impurity the unnormalized slope ∝h ·vhQ(O) is independent of the concentration in the range 1.5-3 at. %. A strong dependence of ∝h and ∝1 on ∆Z, the charge difference between host and impurity, is also observed; however, the results do not follow a simple relation.
Contido em Physical review. B, Condensed matter. New York. Vol. 18, n. 12 (Dec. 1978), p. 6713-6718
Assunto Espectros raios gama
Fisica da materia condensada
Impurezas
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/104160
Arquivos Descrição Formato
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