ISSN:
1434-6036
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract We have used the de Haas-van Alphen (dHvA) effect to study the relaxation times of “neck” and “belly” electrons in copper containing a range of dilute heterovalent and transition-metal solutes. The scattering (Dingle) temperaturex is derived from the variation of signal amplitude with magnetic field at a fixed temperature. Values ofx are believed accurate to within 0.1°K in a range ofx N(neck) from ≃0.4°K to ≃6°K andx B(belly) from ≃0.2°K to ≃3°K. Our results may be summarized as follows:Heterovalent solutes (Zn, Cd, Al; up to 0.1 at. %) $$x_N \simeq 22^\circ K/at.{\mathbf{ }}\% {\mathbf{ }}for{\mathbf{ }}Zn,{\mathbf{ }}Cd;{\mathbf{ }} \simeq {\mathbf{ }}95^\circ K/at.{\mathbf{ }}\% {\mathbf{ }}for{\mathbf{ }}Al.{\mathbf{ }}x_N /x_B \simeq 1.2$$ .Transition-metal solutes (Ni, Co, Fe, Mn, Cr; up to 0.05 at.-%) $$x_N \simeq 22^\circ K/at.{\mathbf{ }}\% {\mathbf{ }}for{\mathbf{ }}Ni,{\mathbf{ }}Mn;{\mathbf{ }} \simeq {\mathbf{ }}95^\circ K/at.{\mathbf{ }}\% {\mathbf{ }}for{\mathbf{ }}Fe,{\mathbf{ }}Cr;{\mathbf{ }} \simeq {\mathbf{ }}70{\mathbf{ }}^\circ K/at.{\mathbf{ }}\% {\mathbf{ }}for{\mathbf{ }}Co.{\mathbf{ }}x_N /x_B \simeq 0.5{\mathbf{ }}for{\mathbf{ }}Ni,{\mathbf{ }}Mn;{\mathbf{ }} \simeq {\mathbf{ }}0.3{\mathbf{ }}for{\mathbf{ }}Fe,{\mathbf{ }}Cr;{\mathbf{ }} \simeq {\mathbf{ }}0.4{\mathbf{ }}for{\mathbf{ }}Co.$$ . An anomalous dependence of dHvA amplitude on magnetic field has been observed for belly oscillations in several very dilute Cu Cr alloys. This anomaly is both concentration and temperature-sensitive, and is probably related to the Kondo effect.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02422526
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