Joule heating and high frequency nonlinear effects in the surface impedance of high Tc superconductors

超导体热力学状态变化中的能量节约与可逆性：焦耳加热与磁卡伦冷却

Energy conservation and reversibility during thermodynamic changes of state in superconductors: Joule heat vs. magnetocaloric cooling

研究超导体热力学状态变化中的能量守恒与可逆性，揭示焦耳加热与磁卡伦冷却的相互作用及温度不均匀性。

Joule heating effects in high transparency Josephson junctions

We study, both theoretically and experimentally, the features on the current-voltage characteristic of a highly transparent Josephson junction caused by transition of the superconducting leads to the normal state. These features appear due to the suppression of the Andreev excess current. We show that by tracing the dependence of the voltage, at which the transition occurs, on the bath temperature and by analyzing the suppression of the excess current by the bias voltage one can recover the temperature dependence of the heat flow out of the junction. We verify theory predictions by fabricating…

Reply to the "Comment on 'Intrinsic tunneling spectra of Bi_2(Sr_{2-x}La_x)CuO_6' "

To better address the heating issue in stacks of intrinsic Josephson junctions, we directly measure temperature of the stack by using a micron-sized thermocouple which is in direct thermal- and electrical contact to the stack, exactly in the place where the bias current is injected. Our measurements have shown that the temperature of the stack can reach 200-300K at the highest bias. Thus, we confirm experimentally that the Joule self-heating is a severe problem in intrinsic-junction-spectroscopy experiments. The pseudogap features reported in our previous paper (A.Yurgens etal, PRL 90, 147005 …

Reply to the "Comment on 'Intrinsic tunneling spectra of Bi_2(Sr_{2-x}La_x)CuO_6' ": Auxiliary information

To better address the heating issue in stacks of intrinsic Josephson junctions, we directly measure temperature of the stack by using a micron-sized thermocouple which is in direct thermal- and electrical contact to the stack, exactly in the place where the bias current is injected. Our measurements have shown that the temperature of the stack can reach 200-300K at the highest bias. Thus, we confirm experimentally that the Joule self-heating is a severe problem in intrinsic-junction-spectroscopy experiments. The pseudogap features reported in our previous paper (A.Yurgens etal, PRL 90, 147005 …

Diversity of flux avalanche patterns in superconducting films

The variety of morphologies in flux patterns created by thermomagnetic dendritic avalanches in type-II superconducting films is investigated using numerical simulations. The avalanches are triggered by introducing a hot spot at the edge of a strip-shaped sample, which is initially prepared in a partially penetrated Bean critical state by slowly ramping the transversely applied magnetic field. The simulation scheme is based on a model accounting for the nonlinear and nonlocal electrodynamics of superconductors in the transverse geometry. By systematically varying the parameters representing the…

超导电路中光子焦耳效应的理论

Theory of the photonic Joule effect in superconducting circuits

本文理论上证明超导电路中的光子热库可被小系统显著加热，导致约瑟夫森结I-V曲线定性改变，即光子焦耳效应，对量子技术高阻抗环境应用至关重要。

Dynamic processes in superconductors and the laws of thermodynamics

The transition from the superconducting to the normal state in a magnetic field was considered as a irreversible thermodynamic process before 1933 because of Joule heating. But all physicists became to consider this transition as reversible after 1933 because of the obvious contradiction of the Meissner effect with the second law of thermodynamics if this transition is considered as a irreversible process. This radical change of the opinion contradicted logic since the dissipation of the kinetic energy of the surface screening current into Joule heat in the normal state cannot depend on how th…