摘要:

The peak effect has been produced in lead in the intermediate state near 0.8Hc, where flux motion is known to occur. The field‐independent pinning centers were introduced by spark‐drilling small holes through the sample.

ISSN:0003-6951    

DOI:10.1063/1.1652699

出版商:AIP    

年代:1969

数据来源: AIP

摘要:

In the present report, data are presented on the transition temperatures and the critical currents of laminated Nb3Sn and Nb3Al0.8Ge0.2tapes. The samples were prepared by rolling techniques and diffusion process. At first, the plates were prepared by accumulating foils of materials alternatively. Then the plates were rolled to a flexible tape and heat‐treated. By heat treatment the transition temperatureTcof Nb3Sn tape increases and reaches the constant value ≃ 18.0°K for 10 min at 1050°C. For Nb3Al0.8Ge0.2,Tc= 19.2°K is obtained by heat treatment at 1600°C for 1 min and annealing at 760°C for 2 h. The critical currents of the samples are discussed.

ISSN:0003-6951    

DOI:10.1063/1.1652700

出版商:AIP    

年代:1969

数据来源: AIP

摘要:

An electron‐mirror infrared image converter using a 4‐&mgr;‐thick layer of 95 at. % of Se and 5 at. % of Bi as both mirror and target has been constructed. Preliminary measurements indicate that the device has a sensitivity of 0.13 &mgr;A per &mgr;W per cm2at a wavelength of 9600 Å.

ISSN:0003-6951    

DOI:10.1063/1.1652701

出版商:AIP    

年代:1969

数据来源: AIP

摘要:

The speed of the transition between the pair tunneling state and the single‐particle tunneling state of Josephson junctions is in the nanosecond region for sufficiently large junction areas and low critical currents. The transition time varies with junction capacitance and inversely with critical current. The delay is calculated to be small compared to the transition time.

ISSN:0003-6951    

DOI:10.1063/1.1652702

出版商:AIP    

年代:1969

数据来源: AIP

摘要:

Experimental evidence is presented for feedback‐narrowed far‐infrared response of a point contact Josephson junction which is strongly coupled to a resonant cavity. The observed response shows high sensitivity(NEP≲ 10−14W/Hz)and frequency selectivity(Q ≳ 103)and so is of value as a tunable narrow‐band detector of millimeter and submillimeter wave radiation. The Werthamer‐Shapiro theory of the nonlinear coupling of junction current to a resonant cavity has been extended to include the effect of applied radiation at the cavity resonance frequency and is shown to account for the feedback narrowing.

ISSN:0003-6951    

DOI:10.1063/1.1652703

出版商:AIP    

年代:1969

数据来源: AIP