Abstract
Hall resistivity ρ 21 ( T , B ) in pure crystals of Zn ( r r r ≃2.5×10 4 ) was measured when B //[0001]. Even in a field much less than magnetic breakdown field, ρ 21 ( B ) showed a considerable deviation from linearity. Below 12 K, ρ 21 ( T ) reduces rapidly to negative value with decreased T . On a sample of thickness of about 50 µm and on a sample involving more impurity ( r r r =2.5×10 3 ), the shift of ρ 21 ( T ) toward negative value with reduced temperature was negligible. These behaviors of ρ 21 ( T , B ) was explained by the anisotropic electron-phonon interaction process. Especially it was found the large effective mass of lens compared with monster played an important role on the anisotropy.
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