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Lindström, Tobias; Johansson, J.; Stepantsov, E. A.; Lombardi, Floriana; Charlebois, Serge A.

doi:10.1103/physrevb.74.014503

Cited by 22 publications

(21 citation statements)

References 38 publications

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“…Assuming that the inductance of the SQUID loop can be neglected, the expression for the total current through the SQUID as a function of applied external magnetic flux / ex containing JJs having a second harmonic component in the CPR is given by [14] …”

Section: Dynamics Of a Current Biased Squidmentioning

confidence: 99%

YBCO SQUIDs with unconventional current phase relation

Johansson

Cedergren

Lindström

et al. 2007

Physica C: Superconductivity and its Applications

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Section: Dynamics Of a Current Biased Squidmentioning

confidence: 99%

YBCO SQUIDs with unconventional current phase relation

Johansson

Cedergren

Lindström

et al. 2007

Physica C: Superconductivity and its Applications

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“…It is also beneficial for junction applications. The problem attracted much attention while studying both highly transparent junctions with strongly anharmonic CPRs and tunnel junctions, where the second harmonic of the supercurrent comes into play due to the suppression of the first one [1][2][3][4][5][6][7][8][9][10] . The latter takes place in the junctions involving unconventional superconductors with special interface-to-crystal orientations and at 0-π transitions.…”

mentioning

confidence: 99%

Anharmonic Josephson current in junctions with an interface pair breaking

Barash

2012

Phys. Rev. B

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Planar superconducting junctions with a large effective Josephson coupling constant and a pronounced interface pair breaking are shown to represent weak links with small critical currents and strongly anharmonic current-phase relations. The supercurrent near Tc is described taking into account the interface pair breaking as well as the current depairing and the Josephson coupling-induced pair breaking of arbitrary strengths. A new analytical expression for the anharmonic supercurrent, which is in excellent agreement with the numerical data presented, is obtained. In junctions with a large effective Josephson coupling constant and a pronounced interface pair breaking, the currentinduced depairing is substantially enhanced in the vicinity of the interface thus having a crucial influence on the current-phase relation despite a small depairing in the bulk. The Josephson current is one of the remarkable manifestations of quantum coherence on the macroscopic scale in condensed matter physics. The supercurrent depends on the phase difference of the order parameters across the junction interface. The study of the current-phase relation (CPR) in the junctions makes it possible to identify physical processes, which form supercurrents under diverse conditions. It is also beneficial for junction applications. The problem attracted much attention while studying both highly transparent junctions with strongly anharmonic CPRs and tunnel junctions, where the second harmonic of the supercurrent comes into play due to the suppression of the first one 1-10 . The latter takes place in the junctions involving unconventional superconductors with special interface-to-crystal orientations and at 0-π transitions.One of the earlier theoretical results, clarifying a variety of aspects of the problem, is the anharmonic CPR for the superconducting point contacts [11][12][13][14][15] . Due to the negligibly small current-induced pair breaking at any transparency value, the theory of point contacts is simplified. The depairing plays an important role in forming anharmonic CPRs in highly transparent planar junctions, unlike its negligible role in point contacts. Since the critical current j c of usual planar junctions becomes, with increasing transparency, comparable with the depairing current j dp in the bulk, the junctions do not represent weak links. In other words, in the junctions, the current-induced depairing brings about a pronounced anharmonicity only in the crossover from the tunnel Josephson current to the bulk superflow 1,16-18 .There are at least three types of pair breaking processes taking place in charge transport in the superconducting junctions: the pair breaking produced by the phase-dependent Josephson coupling, by the current and by the interface itself. These are the very same effects which can lead to a noticeably anharmonic CPR not only at low or intermediate temperatures, but also near T c . Here, I show that planar junctions with a large effective Josephson coupling constant and a pronounced interface pair breaking ca...

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“…13 The 60 nm thick Si 3 N 4 was deposited by plasma enhanced chemical vapor deposition on top of the PES and provides sufficient mechanical stability to resist the large stresses created by the Nb film. After patterning the mask by electron beam lithography and reactive ion etching using CHF 3 …”

Section: Sample Preparationmentioning

confidence: 99%

“…8,9 Recently, it was observed that the critical current of high temperature superconductor dc-SQUIDs shows a ⌽ 0 / 2 periodicity in certain sections of the interference pattern. 3 To explain this observation, it was suggested that the random faceting of the grain boundary induces a distribution of 0 and couplings along the junction. For some particular values of the applied magnetic field, the first order coupling of the overall junction is zero, allowing second order coupling to be dominant.…”

Section: Introductionmentioning

confidence: 99%

“…Under certain conditions, the CPR of the junction͑s͒ is not a simple sine, but it can contain higher harmonics: I s ͑ ͒ = ͚ n I c ͑n͒ sin n , where the coupling coefficients I c ͑n͒ quantify the relative strength of processes with a coherent transfer of n Cooper pairs. 1 In some cases, the first order coefficient I c ͑1͒ can even vanish, for instance, in asymmetric 45°grain boundary junctions in d-wave symmetry superconductors, 2,3 in out of equilibrium superconductornormal-metal-superconductor junctions 4 and for ballistic superconductor-ferromagnet-superconductor ͑SFS͒ junctions at the 0-transition. 5,6 The remaining second order coefficient I c ͑2͒ will result in a doubling of the frequency in the interference pattern.…”

Section: Introductionmentioning

confidence: 99%

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Bistability in superconducting rings containing an inhomogeneous Josephson junction

et al. 2008

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We investigate the magnetic response of a superconducting Nb ring containing a ferromagnetic PdNi Josephson junction and a tunnel junction in parallel. Doubling of the switching frequency is observed within certain intervals of the external magnetic field. For sinusoidal current-phase relations in both junctions, our model of a double superconducting quantum interference device ͑a small two-junction loop that interrupts the larger ring͒ explains this feature by a sequence of current reversals in the ferromagnetic section of the junction in these field intervals. The switching anomalies are induced by the coupling between the magnetic fluxes in the two superconducting loops.

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Josephson dynamics of bicrystald-waveYBa2Cu3O7−

Cited by 22 publications

References 38 publications

YBCO SQUIDs with unconventional current phase relation

YBCO SQUIDs with unconventional current phase relation

Anharmonic Josephson current in junctions with an interface pair breaking

Bistability in superconducting rings containing an inhomogeneous Josephson junction

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