MAGNETIC SUSCEPTIBILITY OF CLOSE-PACKED HEXAGONAL GOLD-INDIUM ALLOYS
The magnetic susceptibility of close-packed hexagonal gold-indium alloys has been measured at 300, 77, 4.2, and 1.2 deg K. The susceptibility data show a striking similarity to the c-axis spacing, exhibiting a maximum at about 19 at.% In, consistent with a model assuming that the Fermi surfaces touch ihe Brillouin zone face (0002) at this concentraiion. (auth) 67l The change of electrical resistance in uniaxial tension was measured over the range 6 io 300'K for several single-crystal specimens of germanium doped with arsenic or antimony. The tensile stress was varied from 1 x 10/sup 7/ io 5 x 10/sup 8/ dynes/cm/sup 2/. Particularly at low temperatures where most of the carriers are bound io impurity centers, the piezoresistance of the conduction band departs strongly from linearity in stress. For the large piezoresistance effects measured with uniaxial stress in STA110! direction, these departures depend in size and magnitude on the kind of donor impurity. It is shown that if the strain-induced shiff of the Fermi energy is taken inio consideration these effects are to be expected from the electron transfer model, which attributes ihe large piezoresistance to the strain-induced changes of the electron concentrations in ihe various conduction band valleys. Theoretical predictions concerning the lowest donor states, a one-fold is-like ground siate and a higher lying three- fold state, are verified for As in Ge. The energy separation between these two states is (4.10 plus or minus 0.15) x 10/sup -3/ ev for As and at least by an order of magnitude smaller for Sb in Ge. The deformation potential constant (conduction band) for pure shear strain was found to be E/sub 2/ = 19.2 plus or minus 0.4 ev at 6.6 deg K. The mobility anisotropy of a valley was found to decrease with decreasing T because of anisotropic scattering by ionized impurities. (auth)
- Research Organization:
- Univ. of Birmingham, Eng.; Univ. of Chicago
- NSA Number:
- NSA-14-000670
- OSTI ID:
- 4195084
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Vol. Vol: 115; Other Information: Orig. Receipt Date: 31-DEC-60
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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