High Temperature Limit of Weak Localization in Thin Silver Films

The behavior of magnetoresistance in thin silver films was investigated from 1.8 up to 104 K. Weak localization effect, manifested by negative magnetoresistance, remains until 88 K in magnetic fields below 2T. Experimental results indicate that weak localization theory for two-dimensional disordercd systems is applicable even when the phase relaxation length L is a few times longer than the elastic mean free path l, provided L is larger than the thickness of films. The obtained phase relaxation time τ obeys 1/T^2.6 law.