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8
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0001602991
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(1991)
Supercond. Sci. Technol.
, vol.4
, pp. 453
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Gol’tsman, G.N.1
Semenov, A.D.2
Gousev, Y.P.3
Zorin, M.A.4
Gogidze, I.G.5
Gershenzon, E.M.6
Lang, P.T.7
Knott, W.J.8
Renk, K.F.9
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12
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36449001681
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Equation (6) in this paper, for the inductive impedance of a microbridge, should have a prefactor [formula omitted] instead of [formula omitted] (M. Nahum, private commun.) For the bridge described in our paper, we find [formula omitted] is only [formula omitted] at 1 THz.
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(1991)
Appl. Phys. Lett.
, vol.59
, pp. 2329
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-
Mees, J.1
Nahum, M.2
Richards, P.L.3
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13
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84950601512
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The relation [formula omitted] is appropriate for a discrete thermal element; our device is a distributed thermal element. Simulations of the distributed system by M. Nahum (private commun.) show that the discrete-element analysis presented here matches Eq. (1) to better than 10%.
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14
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84950601509
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-
The rf dissipation occurs in the bridge and is uniform along the length, because the frequency is above the gap frequency of the bridge. This leads to a parabolic profile for the temperature increase, with the peak temperature [formula omitted] the average rise. The profile is sharper than parabolic for the temperature rise due to dc dissipation, but we use the simpler parabolic law here also.
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15
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84950601510
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The electrons in the bridge need to come to internal thermal equilibrium on a time scale shorter than [formula omitted] The electron-electron inelastic time for thermal electrons at 4.4 K [formula omitted] is [formula omitted]
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-
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16
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0000298080
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see The absorbed rf photon has energy 4 meV for [formula omitted] The initially excited hot electron will share its energy in a time of order 0.01 ns.
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(1984)
Phys. Rev. B
, vol.29
, pp. 3733
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Santhanam, P.1
Prober, D.E.2
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17
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84950601507
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For small dc power dissipation the thermal conductance is given by [formula omitted] with L the Weidemann Franz constant, [formula omitted] and [formula omitted] the effective electrical resistance along the paths through which the heat flows out of the bridge, out the two ends; [formula omitted] We find [formula omitted] at 4.2 K, for [formula omitted] The actual thermal conductance G with finite dc dissipation is smaller than [formula omitted] due to self-heating effects. (Refs. 5 and 9) Thus, [formula omitted] with the self-heating parameter chosen to be [formula omitted] The electron heat capacity is given approximately by [formula omitted] with [formula omitted] and V the microbridge volume in [formula omitted] We define [formula omitted] for the average temperature increase with small dc dissipation.
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20
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84950601508
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-
Our predictions have been developed for [formula omitted] but should apply semi-quantitatively for [formula omitted]
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21
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84950601485
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-
With [formula omitted] the dominant noise is due to temperature fluctuations. In this case, the signal and noise are both attenuated in the same manner above [formula omitted] as [formula omitted] see Eq. (1). The receiver noise temperature will thus remain constant to above 10 GHz if. (N. R. Erickson, private communication)
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