Absence of size dependence in the spin-glass resistivity of AuFe wires?
Laboratorium voor Vaste-Stoffysika en Magnetisme, Katholieke
Universiteit Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
2 Department of Physics and Astronomy, Northwestern University, 2145 Sheridan Road, Evanston, Il 60208, USA
Accepted: 25 April 1996
We report on the low-temperature resistivity of AuFe spin-glass wires with a thickness around and a linewidth varying between and . The observed linewidth dependence of is due to the contribution of the disorder-enhanced electron-electron interaction, while the spin-glass contribution is independent of linewidth. However, a quantitative analysis of the data reveals a substantial suppression of both the amplitude of the spin-glass resistivity and the interaction strength between magnetic impurities when compared to bulk AuFe alloys. This may indicate the presence of a size effect resulting from the finite spin-glass thickness.
PACS: 73.50.-h – Electronic transport phenomena in thin films / 75.50.Lk – Spin glasses and other random magnets / 75.30.Hx – Magnetic impurity interactions
© EDP Sciences, 1996