Electric quadrupole interaction in cubic BCC $\alpha$-Fe
PBN-AR
Instytucja
Akademickie Centrum Materiałów i Nanotechnologii (Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie)
Informacje podstawowe
Główny język publikacji
EN
Czasopismo
Journal of Alloys and Compounds
ISSN
0925-8388
EISSN
1873-4669
Wydawca
Elsevier Science SA
Rok publikacji
2016
Numer zeszytu
Strony od-do
420--425
Numer tomu
673
Link do pełnego tekstu
Identyfikator DOI
Liczba arkuszy
0.42
Autorzy
(liczba autorów: 6)
Pozostali autorzy
+ 4
Słowa kluczowe
EN
Mössbauer spectroscopy
cubic ferromagnet
electric field gradient (EFG)
Streszczenia
Język
EN
Treść
Mossbauer transmission spectra for the 14.41-keV resonant line in Fe-57 have been collected at room temperature by using Co-57(Rh) commercial source and alpha-Fe strain-free single crystal as an absorber. The absorber was magnetized to saturation in the absorber plane perpendicular to the gamma-ray beam axis applying small external magnetic field. Spectra were collected for various orientations of the magnetizing field, the latter lying close to the [110] crystal plane. A positive electric quadrupole coupling constant was found practically independent on the field orientation. One obtains the following value V-zz = +1.61(4) x 10(19) Vm(-2) for the (average) principal component of the electric field gradient (EFG) tensor under assumption that the EFG tensor is axially symmetric and the principal axis is aligned with the magnetic hyperfine field acting on the Fe-57 nucleus. The nuclear spectroscopic electric quadrupole moment for the first excited state of the Fe-57 nucleus was adopted as + 0.17 b. Similar measurement was performed at room temperature using as-rolled polycrystalline alpha-Fe foil of high purity in the zero external field. Corresponding value for the principal component of the EFG was found as V-zz = +1.92(4) x 10(19) Vm(-2). Hence, it seems that the origin of the EFG is primarily due to the local (atomic) electronic wave function distortion caused by the spineorbit interaction between effective electronic spin S and incompletely quenched electronic angular momentum L. It seems as well that the lowest order term proportional to the product L.lambda.S dominates, as no direction dependence of the EFG principal component is seen. The lowest order term is isotropic for a cubic symmetry as one has lambda = lambda 1 for cubic systems with the symbol 1 denoting unit operator and l being the coupling parameter. (C) 2016 Elsevier B.V. All rights reserved.
Cechy publikacji
original article
peer-reviewed
Inne
System-identifier
idp:102016
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