Giant Quantum Osciltions of Ultrasonic Absorption by Metals in the Phase Transition of Ordep 2 1/2
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Date
1983-06
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Addis Ababa University
Abstract
The absorntion coefficient r of a normal metal like
any on0 of the thermodynamic and kinematic properth,s of the
metal greatlv clenenc:1s unon the .state in "lhich the motul is
found. Z\t Iml enough ter~n8ratures and the metal goinq through
electronic nhase transition, the absorntion coefficient under
the action of an external magnetic fielc:1 is shown to assume
different values in differ.ent regions of Z, the par.amoter of
PT'-2~. In PT-?!z ilssoiated with apnearance of a neN spheroidal
cavity, it is found to bo lo\'] and monotonous b810w a certain
threshold value Z* while ShOl'IS Giant Quantu!T1. Oscillations (GQO)
with exponentially rising amplitude for values Z »z*,
t
the
conditions of observation of GIIO l'-e infT kn T «hl1 « I Z I . In
PT-?!z associated "lith breaking of the Fermi neck the absorpt:.
ion coefficient ShO"IS strict dependence on the angle of orientation
of the Plv.gnetic field (e). Near a=o, it is found to
behave in the same 'qay as in the apnearance of a snheroidal
cavity NhereaB near a critical
shows a sharp anisotropy of the
value of the angle 8Cy it
root .. type (0 - 8 rz - cr
t Wherever hal/pears as a symbol here after in this manu·,
scriDt it must be read as to
Description
Keywords
Absorption by Metals