The origin of resistance peak effect in high-temperature superconductors-apparent T/sub c/ anisotropy due to J/sub c/ anisotropy

Buzea, Cristina; Tachiki, Takashi; Nakajima, Kensuke; Yamashita, Tsutomu

doi:10.1109/77.919857

Cited by 9 publications

(13 citation statements)

References 11 publications

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“…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.…”

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confidence: 43%

“…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: 99%

“…[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 !…”

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

et al. 2013

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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...

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

et al. 2013

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“…5). It is very remarkable that the multiple-gap conventional Cooper pairing is directly found in a number of point-contact, tunneling and Raman measurements 6 . It is even more important that the distribution of gaps may be rather broad 7 and spatially-resolved 8 , although much controversy exists over the number and widths of gaps in the electron density of states (DOS).…”

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confidence: 97%

Heat capacity of mesoscopically disordered superconductors: implications for MgB2

Gabovich¹,

Войтенко²,

Li³

et al. 2002

Low Temperature Physics

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Electronic heat capacity C(T ) was calculated for a mesoscopically disordered s-wave superconductor treated as a spatial ensemble of domains with a continuously varying superconducting properties. The domains are assumed to have sizes L > ξ0, where ξ0 is the coherence length. Each domain is characterized by a certain critical temperature Tc0 in the range [0, Tc]. The averaging over the superconducting gap distribution leads to C(T ) ∼ T 2 for low T , whereas the specific heat anomaly at Tc is substantially smeared. The results explain well the C(T ) data for MgB2, where a multiplegap structure is observed.

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“…So strong influence of technological parameter on the shape of N/S transition curve in HTS material can be used in further studies of the PM effect to regulate and reveal factors influencing and determining so complicated shape of the N/S phase transition curve. Similar anomalous superconducting transition, consisting of a peak just above in the resistance vs. temperature curves (named as the resistance 'peak' effect -detail information see in [18]) has been detected widely in high-and low-superconductors in four-point contact configuration too. Although several ideas have been proposed to explain it, the physical origin of this anomaly is also still not understood finally.…”

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confidence: 95%

Complicated shape of the superconductive transition curve revealed by a sensitive OFC-magnetometer

Gevorgyan

Kiss

Shirinyan

et al. 2003

IEEE Trans. Appl. Supercond.

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Because of pick-up coil's flat design, relatively low operation frequency ( 23 MHz) and high relative resolution (10 6 ) a single-layer Open-Flat Coil-based tunnel diode oscillator (OFCmagnetometer) has advantages, compared to other test methods. They become crucial at nondestructive studies with thin flat HTS materials (with small signals), especially near (at start of the 'Cooper' pairs' formation). Due to these a new 'Para-Magnetic' peculiarity of the normal-to-superconductive (N/S) transition was detected recently in YBaCuO films. It precedes the 'Meissner' ejection and specifies details of an actually complicated shape of the N/S transition curve. We discuss influence of the currents and magnetic field on the PM effect and relationship between the quality of HTS material and amplitude of the effect. Differences between PM effect and externally close 'paramagnetic Meissner' and resistive 'peak' effects are discussed too.Index Terms-Fluctuation region, highsuperconductive (HTS) films, OFC-magnetometer, para-magnetic effect.

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The origin of resistance peak effect in high-temperature superconductors-apparent T/sub c/ anisotropy due to J/sub c/ anisotropy

Cited by 9 publications

References 11 publications

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

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

Heat capacity of mesoscopically disordered superconductors: implications for MgB2

Complicated shape of the superconductive transition curve revealed by a sensitive OFC-magnetometer

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