Browsing by Author "Wetro, Legesse"

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    Giant Quantum Osciltions of Ultrasonic Absorption by Metals in the Phase Transition of Ordep 2 1/2
    (Addis Ababa University, 1983-06) Wetro, Legesse
    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