Microwave surface resistance peak at Tc in Bi2Sr2CaCu2O8 + x film

Silva, Enrico; Lanucara, Marco; Marcon, R.

doi:10.1016/s0921-4534(97)00022-1

Cited by 9 publications

(13 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4(d) [34]. We would like also to emphasize that in our case the anomalous giant resistance peak is observed in a 3D system and this makes our experimental findings and the proposed empirical modeling qualitatively different from the well-studied cases with the 1D [5,6,12,14,15] and/or 2D [2][3][4][7][8][9][10][11]13,16] systems.…”

contrasting

confidence: 67%

“…Later on, in thin films [2][3][4] and 1D whiskers and wires [5,6], similar effects were also found, with a considerably higher amplitude of the RðTÞ anomaly: 16% and 160%. With the discovery of quasi-2D cuprates, the RðTÞ peak around T c was also reported for these lowdimensional materials, such as NdCeCuO [7], BiSrCaCuO [8,9], and LaSrCuO [10,11], with the peak amplitude reaching 400%-700%. In 2D and 1D microstructures [6,[12][13][14][15][16], made from conventional superconducting materials (mostly Al), a narrow resistance peak close to T c was also observed, with the peak amplitude reaching the 400% level.…”

mentioning

confidence: 83%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]), the two characteristic temperatures T c (local) and T c (global) are different: T c (global) <T c (local). Localized bosonic islands are formed first at higher temperature T c (local), which leads to the suppression of conductivity N !…”

mentioning

confidence: 99%

See 2 more Smart Citations

Metal–Bosonic Insulator–Superconductor Transition in Boron-Doped Granular Diamond

et al. 2013

View full text Add to dashboard Cite

In a variety of superconductors, mostly in two-dimensional (2D) and one-dimensional (1D) systems, the resistive superconducting transition RðTÞ demonstrates in many cases an anomalous narrow RðTÞ peak just preceding the onset of the superconducting state R ¼ 0 at T c . The amplitude of this RðTÞ peak in 1D and 2D systems ranges from a few up to several hundred percent. In three-dimensional (3D) systems, however, the RðTÞ peak close to T c is rarely observed, and it reaches only a few percent in amplitude. Here we report on the observation of a giant ($ 1600%) and very narrow ( $ 1 K) resistance peak preceding the onset of superconductivity in heavily boron-doped diamond. This anomalous RðTÞ peak in a 3D system is interpreted in the framework of an empirical model based on the metal-bosonic insulator-superconductor transitions induced by a granularity-correlated disorder in heavily doped diamond. DOI: 10.1103/PhysRevLett.110.077001 PACS numbers: 74.70.Wz, 71.30.+h, 74.25.Àq, 74.62.En Since the 1950s [1], a puzzling anomalous increase of resistance, RðTÞ, preceding the superconducting transition, has been reported in some superconducting systems situated not yet in the vicinity of the insulator-metal transition (IMT) with relatively low residual resistance. At first, the increase was only observed at the level of a few percent. Later on, in thin films [2][3][4] and 1D whiskers and wires [5,6], similar effects were also found, with a considerably higher amplitude of the RðTÞ anomaly: 16% and 160%. With the discovery of quasi-2D cuprates, the RðTÞ peak around T c was also reported for these lowdimensional materials, such as NdCeCuO [7], BiSrCaCuO [8,9], and LaSrCuO [10,11], with the peak amplitude reaching 400%-700%. In 2D and 1D microstructures [6,[12][13][14][15][16], made from conventional superconducting materials (mostly Al), a narrow resistance peak close to T c was also observed, with the peak amplitude reaching the 400% level.Different models were used to explain the nature of the anomalous RðTÞ peak: normal-metal-superconductor boundaries, disorder and fluctuations, vortex dynamics and Josephson coupling in layered systems, charge imbalance, and competition between superconducting and insulating states in 2D systems [1,2,4,6,8,[12][13][14]16,17].All these observations of the RðTÞ peak around T c and the corresponding models and theories, formulated to explain the corresponding experimental data, are very much linked to the reduced dimensionality of the investigated systems: 2D or/and 1D. We have found reports on the RðTÞ peak for 3D-like metallic Cu-Zr glasses only in a couple of previous publications [17,18] with a quite small RðTÞ peak amplitude-less than 3%. We present here our novel observations of the giant RðTÞ peak in 3D boron-doped granular diamond, which are very different from previously reported data in the following important aspects.First, the effect has a giant amplitude: the peak resistance value exceeds the residual resistance close to T c by 550%-1600%, which is a much higher value tha...

show abstract

contrasting

confidence: 67%

mentioning

confidence: 83%

See 1 more Smart Citation

Metal–Bosonic Insulator–Superconductor Transition in Boron-Doped Granular Diamond

et al. 2013

View full text Add to dashboard Cite

show abstract

“…The small thickness of our samples allows the use of the thin film approximation in which Z ef f = ρ/d, where ρ is the complex resistivity of the superconductor. We did not observe, in the [T , H, ν] region here explored, resonances such as the well known substrate resonances occurring in thin films [12]. The actually measured reflection coefficient Γ m (ν), determined by the VNA at its input, include the sample response Γ(ν) as well as the interposed coaxial line response.…”

Section: Resultsmentioning

confidence: 77%

New aspects of microwave properties of Nb in the mixed state

Pompeo

Silva

Sarti

et al. 2010

Physica C: Superconductivity

Self Cite

View full text Add to dashboard Cite

We present a study of the frequency dependence of the vortex dynamics in a conventional superconduc-\ud tor. We have employed a swept frequency, Corbino disk technique to investigate the temperature (3:6 K –\ud Tc) and high-field (from Hc2 =2 to Hc2 ) microwave complex resistivity in Nb thin (20–40 nm) films as a\ud function of the frequency (1–20 GHz). We have found several previously unnoticed features: (i) a field-\ud dependent depinning frequency in the GHz range; (ii) deviations from the accepted frequency depen-\ud dence [1], that can be ascribed to some kind of vortex creep; and (iii) the presence of switching phenom-\ud ena, reminiscent of vortex instabilities. We discuss the possible origin of the features here reported

show abstract

“…Measurements of the field and/or temperature induced changes of the quality factor Q and resonance frequency f 0 yielded changes in the effective surface impedance through the well known expression ∆Z ef f s (H, T ) = G∆ 1 Q(H,T ) − 2if 0 (H, T ) , where G is an appropriate geometrical factor 3 Noticeable exceptions are dielectrics with strong temperature dependent permittivity [110,114,115,116] or with an accidentally unfavorable combination of thickness, permittivity and operating frequency [117]. 4 We note that demagnetization effects determine a penetration field much smaller than Hc1 in thin films [119], and field inhomogeneities inside the sample are expected (and also directly found [120]) to be irrelevant in thin films for fields greater than a few mT in our temperature range.…”

Section: Cavity Measurementsmentioning

confidence: 99%

Mixed-State Microwave Response in Superconducting Cuprates

et al. 2006

Self Cite

View full text Add to dashboard Cite

We investigate the physics of the microwave response in YBa 2 Cu 3 O 7−δ , SmBa 2 Cu 3 O 7−δ and MgB 2 in the vortex state. We first recall the theoretical basics of vortex-state microwave response in the London limit. We then present a wide set of measurements of the field, temperature, and frequency dependences of the vortex state microwave complex resistivity in superconducting thin films, measured by a resonant cavity and by sweptfrequency Corbino disk. The combination of these techniques allows for a comprehensive description of the microwave response in the vortex state in these innovative superconductors. In all materials investigated we show that flux motion alone cannot take into account all the observed experimental features, neither in the frequency nor in the field dependence. The discrepancy can be resolved by considering the (usually neglected) contribution of quasiparticles to the response in the vortex state. The peculiar, albeit different, physics of the superconducting materials here considered, namely two-band superconductivity in MgB 2 and superconducting gap with lines of nodes in cuprates, give rise to a substantially increased contribution of quasiparticles to the field-dependent microwave response. With careful combined analysis of the data it is possible to extract or infer many interesting quantities related to the vortex state, such as the temperature-dependent characteristic vortex frequency and vortex viscosity, the field dependence of the quasiparticle density, the temperature dependence of the σ-band superfluid density in MgB 2

show abstract

Microwave surface resistance peak at Tc in Bi2Sr2CaCu2O8 + x film

Cited by 9 publications

References 28 publications

Metal–Bosonic Insulator–Superconductor Transition in Boron-Doped Granular Diamond

Metal–Bosonic Insulator–Superconductor Transition in Boron-Doped Granular Diamond

New aspects of microwave properties of Nb in the mixed state

Mixed-State Microwave Response in Superconducting Cuprates

Contact Info

Product

Resources

About