摘要:

Preliminary results on the strong dependence of current‐voltage characteristics of ZnO‐based metal oxide varistors on pressure up to ∼5 kbar (nominal) are reported. This letter perhaps constitutes the first pressure study on electronic ceramics.

ISSN:0003-6951    

DOI:10.1063/1.88869

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

The theory of MIS‐Schottky barriers and their electrical characteristics is examined for its application to solar cells. It is found that the interface behavior of contacts forward‐biased by illumination is qualitatively different from that of the same contacts biased in the dark by an applied forward voltage. Observed increases due to the interfacial layer in the open‐circuit voltage of the solar cell cannot therefore be associated with increases in the ’’nvalue’’ measured for the dark current, but rather are due to the different effects of this layer on the transport properties of majority and minority carriers. The theory predicts an optimum thickness for the interfacial layer above which the short‐circuit (minority‐carrier) current decreases, and the efficiency (fill factor) is degraded.

ISSN:0003-6951    

DOI:10.1063/1.88870

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

Vapor‐grown double‐heterojunction (DH) laser structures of GaAs/InyGa1−yP have been prepared with room‐temperature threshold current densities as low as 1140 A/cm2and differential quantum efficiencies as high as 47%. cw operation at room temperature has been obtained from such devices.

ISSN:0003-6951    

DOI:10.1063/1.88871

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

A new process for plasma oxidation of GaAs has been developed. Oxide films formed by this simple one‐step dry process have amorphous structure, with composition and thickness uniformity better than ±10% over areas ≲1 cm2. They have a gallium‐to‐arsenic ratio of nearly one. The electrical properties (I‐V,C‐V) of the films are such that this process may be useful in device fabrication.

ISSN:0003-6951    

DOI:10.1063/1.88872

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

We report the fabrication of a capacitor‐shunted Josephson junction and its use as a microwave device with improved coupling to microwave fields. The junction was evaporated on a thin plastic substrate which was subsequently folded like a flat‐spring clip in order to make a circular coupling loop terminated by a parallel‐plate capacitor. The capacitor short‐circuits the loop for high‐frequency currents but keeps it open for dc currents, rendering possible the application of dc bias to the junction. The folded junction was observed atXband to couple 20 dB better to rf power than the same junction extended flat.

ISSN:0003-6951    

DOI:10.1063/1.88873

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

The superconducting critical temperatureTcand high‐magnetic‐field critical‐current densitiesJchave been measured on bronze‐processed Nb3Sn single‐core wires prior to and after removing the bronze cladding. BothTcandJc, at high magnetic fields, are increased after removal of the cladding.Tcmeasurements on a series of wires with various core‐to‐matrix ratiosRshow that the depression inTcincreases asRdecreases. The results are interpreted in terms of a stress imposed on the Nb3Sn layer by the thermal contraction of the outer bronze cladding. Results point to the possibility of a martensitic phase transformation occurring in the bronze‐clad Nb3Sn wires.

ISSN:0003-6951    

DOI:10.1063/1.88883

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

A model (with no free parameters) for the current‐driven motion of magnetic bubble lattices is developed, consisting of massless damped elements (bubbles) connected by linear springs (representing the bubble‐bubble interaction). For the specific system considered, the model yields a saturation velocity of about 1 m/sec, in agreement with experiment. The variation of bubble diameter is not explicitly computed; treatment of this additional degree of freedom should produce a still more realistic model.

ISSN:0003-6951    

DOI:10.1063/1.88884

出版商:AIP    

年代:1976

数据来源: AIP