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1 Sep 1971

Volume 42, Issue 10, pp. 3659-4111

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Comments on ``Transition from Ohmic to Space‐Charge‐Limited Conduction''

H. J. Queisser

J. Appl. Phys. 42, 4083 (1971); http://dx.doi.org/10.1063/1.1659728 (2 pages)

Online Publication Date: 17 December 2003

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In a recent note, Goronkin treats the problem of Ohmic vs space‐charge‐limited currents in high‐resistivity semiconductor materials. He arrives at the conclusion ``that it is possible to select a material that will carry only space‐charge‐limited current when it conducts at all''. For GaAs, this condition should hold for a doping n < 2×1010 electron∕cm3. This assertion would be significant for proposed nonlinear devices operating at very low voltages, such as 5 mV, predicted by Goronkin. The assertion pertains also to a new régime of semiconductor behavior, termed ``relaxation case'' by van Roosbroeck and Casey, who find a range of linear current∕voltage relation up to 10 V in GaAs with only 5 × 107 electron∕cm3. This note shows that Goronkin's paper contains errors of many orders of magnitude and that his results are invalid.

Interrelationship between Acoustic and Shock‐Wave Properties of Solids

Y. K. Huang

J. Appl. Phys. 42, 4084 (1971); http://dx.doi.org/10.1063/1.1659729 (2 pages) | Cited 2 times

Online Publication Date: 17 December 2003

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Abstract Unavailable

Effect of Hydrostatic Pressure on the Stress‐Strain Curves of OFHC Copper

A. E. Abey

J. Appl. Phys. 42, 4085 (1971); http://dx.doi.org/10.1063/1.1659730 (3 pages) | Cited 1 time

Online Publication Date: 17 December 2003

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Effect of Nonmagnetic Inclusions on the Spin‐Wave Linewidth in Polycrystalline YIG

D. G. Scotter

J. Appl. Phys. 42, 4088 (1971); http://dx.doi.org/10.1063/1.1659731 (3 pages) | Cited 13 times

Online Publication Date: 17 December 2003

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Nonmagnetic second‐phase inclusions of two different average sizes (2.5 ± 0.5 and 1.2 ± 0.5 μ m) were produced in specimens of polycrystalline YIG. A dependence of spin‐wave linewidth on inclusion size was observed. The linear relationship between spin‐wave linewidth and the concentration of second‐phase inclusions was dependent on the wave vector k. At k ≈ 2 × 105 cm−1, the relationship was 0.15 Oe and 0.075 Oe per % second‐phase concentration for the samples with the smaller and larger inclusions, respectively. It is suggested that in porous specimens the average size of the pores may affect the spin‐wave linewidth and that this effect is similar to the transit‐time effect produced by finite grain sizes.
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Comments on ``Hot‐Electron Anisotropy of Microwave Conductivity in Nonparabolic Semiconductors''

Ernst Bonek and Hans W. Pötzl

J. Appl. Phys. 42, 4091 (1971); http://dx.doi.org/10.1063/1.1659732 (2 pages)

Online Publication Date: 17 December 2003

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Abstract Unavailable

Twist Disclination Loops in Nonhomogeneous Media

Tsu‐Wei Chou

J. Appl. Phys. 42, 4092 (1971); http://dx.doi.org/10.1063/1.1659733 (3 pages) | Cited 15 times

Online Publication Date: 17 December 2003

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Thermoelectric Currents in γ‐Irradiated Lucite

P. H. Murphy and F. E. Hoecker

J. Appl. Phys. 42, 4094 (1971); http://dx.doi.org/10.1063/1.1659734 (3 pages) | Cited 3 times

Online Publication Date: 17 December 2003

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Thermoelectric currents have been observed in thin lucite disks after exposure to γ radiation. If an electric potential difference is also impressed upon the sample during the heating cycle, the currents are enhanced or depressed depending on the magnitude and polarity of the applied voltage. The measured charge is a linear function of the applied electric field strength and the field strength necessary to completely suppress the currents appears to be more closely related to the radiation dose than to the temperature gradient in the sample during heating.

Cholesteric Films as Optical Filters

James Adams, Werner Haas, and John Dailey

J. Appl. Phys. 42, 4096 (1971); http://dx.doi.org/10.1063/1.1659735 (3 pages) | Cited 14 times

Online Publication Date: 17 December 2003

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A new class of large‐area optical filters based on the special reflection properties of cholesteric liquid crystals is described. Several filtering functions are provided by various combinations of liquid‐crystal films, polarizers, and retardation plates.

Spatial Resolution of Gain in CO2 Transversely Excited Pulsed Discharge

A. M. Robinson

J. Appl. Phys. 42, 4098 (1971); http://dx.doi.org/10.1063/1.1659736 (3 pages) | Cited 5 times

Online Publication Date: 17 December 2003

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Abstract Unavailable

Photon‐Capture Cross Section by Electrons at the Impurity Center of a ZnSe:Cu Photoconductor

L. H. Tang

J. Appl. Phys. 42, 4101 (1971); http://dx.doi.org/10.1063/1.1659737 (2 pages) | Cited 6 times

Online Publication Date: 17 December 2003

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Fictitious Background Doping Effect on Diffusion in Silicon

S. M. Hu

J. Appl. Phys. 42, 4102 (1971); http://dx.doi.org/10.1063/1.1659738 (4 pages)

Online Publication Date: 17 December 2003

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In this note we suggest an explanation for the widely reported phenomenon of the background doping effect on impurity diffusion in silicon. We also present the relationship between the background doping and what may be called the fictitious surface concentration as well as what may be called the fictitious diffusivity.

The Sensitivity of the Q of Superconducting rf Cavities to Surface Conditions

Myron Strongin

J. Appl. Phys. 42, 4105 (1971); http://dx.doi.org/10.1063/1.1659739 (3 pages) | Cited 4 times

Online Publication Date: 17 December 2003

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Abstract Unavailable

Propagation of Slip across a Twist Boundary by Means of Grain‐Boundary Twist‐Disclination Loops

E. S. P. Das and M. J. Marcinkowski

J. Appl. Phys. 42, 4107 (1971); http://dx.doi.org/10.1063/1.1659740 (3 pages) | Cited 8 times

Online Publication Date: 17 December 2003

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A new mechanism is proposed by which the motion of an edge dislocation across a twist boundary can be accomplished without recourse to dislocation climb. This mechanism involves the creation of a twist‐disclination loop in the plane of the grain boundary and with an angle of rotation equal to the angle of misorientation. This will bring the two grains to crystallographic match within this loop and allows the edge dislocation to slip from one grain to the other through this disclination loop. An order‐of‐magnitude calculation for the diameter of the loop (≈ 70 Å at θ=5°) shows that these loops can be observed within the electron microscope.

Pulse Shape of a Mode‐Locked Frequency‐Doubled Nd:YAG Laser

R. R. Rice

J. Appl. Phys. 42, 4109 (1971); http://dx.doi.org/10.1063/1.1659741 (3 pages) | Cited 1 time

Online Publication Date: 17 December 2003

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The pulse shape of a mode‐locked frequency‐doubled Nd:YAG laser using a single Ba2NaNb5O15 crystal for both SHG and phase modulation has been compared at 1.06 and 0.53 μm. The two pulse shapes are identical within the limits of measurement. The phase‐state switches normally observed in a mode‐locked Nd:YAG laser are absent under the proper operating conditions.
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