Submillimetric cyclotron resonance linewidths and electron relaxation time in copper |
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Authors: | P Goy G Weisbuch |
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Institution: | (1) Laboratoire de Physique des Solides de l'E.N.S., 24, Rue Lhomond, F-75 Paris Ve, France |
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Abstract: | For the first time submillimetric microwaves (λ<1 mm) are used to observe Azbel' Kaner cyclotron resonance in metals. The very high frequency used (typicallyF≅400 GHz) gives a large value ofωτ (typically 500) and therefore very sharp peaks. The fundamental resonance fieldH
c=m
*
cω/e is rather high (typically 200 KG), so subharmonicsH
c/n can be observed at many values ofH in the field region 0–27 KG. If relatively few electrons participate in the resonance and ifω
cτ≧50 (ω
c=eH/m
*
c,τ relaxation time) thenChambers has shown that the line shapes are independent of relaxation time while the fractional linewidthΔH/H varies as l/ωτ. For the belly orbit in pure copper the conditions of Chambers' theory are satisfied forH≧20 KG parallel to 111] axis.m
* is a minimum andτ=1.8×10−10 s. |
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Keywords: | |
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