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Ruibal, M; Ferro, Gonzalo; Osorio, Manuel; Maza, J.; Veira, J.A.; Vidal, F.

doi:10.1103/physrevb.75.012504

Cited by 24 publications

(27 citation statements)

References 28 publications

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“…17, it is shown that in YBa 2 Cu 3 O 7Àd thin film microbridge structure, similar to the HTS coplanar waveguide one studied in the present paper, a switching effect (quenching) is observed in the dissipative state when structure is exposed to millisecond-long high DC pulses. The current-voltage curves of the microbridges with widths smaller than the thermal diffusion length have been measured.…”

supporting

confidence: 61%

“…The authors of the Ref. 17 concluded that for high current densities varying in the millisecond range, the intrinsic quenching mechanism is self-heating caused by conventional flux-flow effects. However, the authors emphasized that this conclusion does not exclude the relevance of other quenching mechanisms for another current densities and characteristic times.…”

mentioning

confidence: 99%

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Direct-current-assisted microwave quenching of YBa2Cu3O7−δ coplanar waveguide to a highly dissipative state

Cherpak

Lavrinovich

Gubin

et al. 2014

Applied Physics Letters

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The paper reports on finding the effect of a strong change in the microwave losses in an HTSbased coplanar waveguide (CPW) at certain values of the input power P in and direct current I dc .CPW on the basis of 150 nm thick YBa 2 Cu 3 O 7-δ epitaxial film on a single crystal MgO substrate was studied experimentally. A sharp and reversible transition of the CPW into a strongly dissipative state at the certain meanings of P in and I dc depending on temperature was observed.Apparently the effect can be explained by self-heating of HTS structure caused by magnetic flux flow under the joint influence of MW and DC.Since discovery of high-temperature superconductors (HTS) in 1986 [1] a lot of attention has been given to studying nonlinear properties of HTS in microwave (MW) fields [2][3][4].

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confidence: 61%

mentioning

confidence: 99%

Direct-current-assisted microwave quenching of YBa2Cu3O7−δ coplanar waveguide to a highly dissipative state

Cherpak

Lavrinovich

Gubin

et al. 2014

Applied Physics Letters

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“…In addition, the widths of our microbridges are well above the threshold at which J * is sample-width dependent (Ruibal et al, 2007). The strong increase of E for current densities around J * make this type of samples very useful for FCL.…”

Section: Superconducting Fault Current Microlimitersmentioning

confidence: 83%

“…The measurements were made in a cryostat with the sample submerged in a forced flow of helium gas. The temperature of the copper holder of the microlimiter was measured with a platinum thermometer and regulated with an electronic system which ensures a temperature stabilization better than 0.05 K. Two examples of the I − V curves obtained in this R L − R b circuit (with R L = 4.9 Ω, this value taking already into account the resistance of the circuit electrical wires, of the order of 1.9 Ω) by using the electronic system described elsewhere (Ruibal et al, 2007;Viña et al, 2003) are shown in figure 25. In these curves the voltage was imposed and acquired during pulses of 1 s, a time much longer than the one needed by the microlimiter to reach the stationary state.…”

Section: Superconducting Fault Current Microlimitersmentioning

confidence: 99%

“…with n = 3/2 for I * (Ruibal et al, 2007;Viña et al, 2003) and 1/2 for I min (Skocpol et al, 1974;Gurevich & Mints, 1987;Paulin et al, 1995). Therefore, if the reduced temperature increases both the discontinuity at V * and the ratio I * /I min will decrease, in agreement with the results of figure 25 The "optimal" reduced temperature for the microlimiter operation, T op /T c , will be then given by the condition I * (T op )=I min (T op ).…”

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Thermal Behaviour and Refrigeration of High-Temperature Superconducting Fault Current Limiters and Microlimiters

Veira¹,

Osorio²,

Vidal³

2012

Superconductors - Properties, Technology, and Applications

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Thermal behaviour of high-temperature superconducting fault current limiters: Application to microlimiters

Lorenzo-Fernández

Osorio

Veira

et al. 2010

Journal of Physics and Chemistry of Solids

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a b s t r a c tFault current limiters are one of the most promising applications of high-temperature superconductors. Two important and interrelated aspects of these devices are their thermal behaviour and their refrigeration. Here we will present some results of our recent researches about this topic concerning the possibility of using superconducting thin-film microbridges as very efficient microlimiters intended to operate at very low powers as could be superconducting microelectronics applications (SQUID based electronics, infrared detectors, etc.).& 2010 Published by Elsevier Ltd.Superconducting fault current limiters (SFCL) based on high temperature superconductors (HTSC) of different types, inductive, resistive or hybrid (i.e. inductive-resistive), have being extendedly studied [1][2][3][4][5][6][7]. The refrigeration and thermal behaviour of the superconducting elements are aspects of crucial importance for the overall performance of these devices. Thin film samples present several advantages to be used in current limiting applications [4,8,9]. We have studied the use of this kind of samples in two up to now nearly unexplored configurations. One is a hybrid limiting device based on meandered HTSC thin-films refrigerated by using a thermoacoustic refrigerator [10], and the other a resistive FCL based on ''thermally small'' superconducting microbridges [9] intended to operate at very low powers (SQUID based electronics, infrared detectors, etc.). In this work we will summarize some of our recent results on this last issue.In Fig. 1 we show a typical electric field versus current density (EÀ J) curve, corresponding to one of the microbridges (denoted BS7) used in our experiments. This microbridge, whose length, width and thickness are, respectively, 385 mm, 28 mm and 300 nm, and with T c ¼ 88.6 K, has been grown on a sapphire substrate. The two characteristic current densities are indicated in this figure:The critical, J c , at which dissipation first appears, and the so-called supercritical, J * , at which the microbridge is triggered into highly dissipative states. Let us note here that we have chosen for our studies microbridges of these dimensions to guarantee a good thermal behaviour before, during and after the current fault, as we will see below. In addition, the widths of our microbridges are well above the threshold at which J * is sample-width dependent [11]. The strong increase of E for current densities around J * make this type of samples very useful for FCL. However, the current is effectively limited only for electric fields or, equivalently, applied voltages well above that at which the limiter is triggered from normal operation (sample in the superconducting state) to current fault mode. In addition, once J * is attained, a thermal runaway [12,13] can be provoked which causes the reduction of the circulating current well below the nominal value (i.e., the current in normal operation without a fault) or very important damage on the microbridge (that can be even burnt out).The superconducting ...

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Size effects on the quenching to the normal state ofYBa2Cu3O7−δthin-film superconduc

Cited by 24 publications

References 28 publications

Direct-current-assisted microwave quenching of YBa2Cu3O7−δ coplanar waveguide to a highly dissipative state

Direct-current-assisted microwave quenching of YBa2Cu3O7−δ coplanar waveguide to a highly dissipative state

Thermal Behaviour and Refrigeration of High-Temperature Superconducting Fault Current Limiters and Microlimiters

Thermal behaviour of high-temperature superconducting fault current limiters: Application to microlimiters

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