Resistance anomaly near the superconducting transition temperature in short aluminum wires

Santhanam, P.; C., C.; Wind, Shalom J.; Brady, Michael; Bucchignano, J.

doi:10.1103/physrevlett.66.2254

Cited by 125 publications

(90 citation statements)

References 23 publications

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“…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%.…”

supporting

confidence: 54%

“…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%.…”

mentioning

confidence: 97%

mentioning

confidence: 97%

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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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supporting

confidence: 54%

mentioning

confidence: 97%

mentioning

confidence: 97%

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

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“…While similar resistance peaks in superconducting hybrid structures have been attributed to, for instance, non-equilibrium charge imbalance [46][47][48][49] and spin accumulation 50,51 effects, Ref. 21 has ruled these scenarios out for their observations.…”

Section: Resistance Peak Due To Superconducting Fluctuations − Amentioning

confidence: 98%

“…We note that similar resistance peaks have been observed in various superconducting hybrid structures in the past. [46][47][48][49][50][51] However, Ref. 21 claims that the peaks observed in their experiment are distinct from those attributed to nonequilibrium charge imbalance [46][47][48][49] and spin accumulation 50,51 effects.…”

Section: Introductionmentioning

confidence: 99%

Microscopic theory for a ferromagnetic nanowire/superconductor heterostructure: Transport, fluctuations, and topological superconductivity

Takei

Galitski

2012

Phys. Rev. B

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Motivated by the recent experiment of Wang et al. [Nature Physics 6, 389 (2010)], who observed a highly unusual transport behavior of ferromagnetic Cobalt nanowires proximity-coupled to superconducting electrodes, we study proximity effect and temperature-dependent transport in such a mesoscopic hybrid structure. It is assumed that the asymmetry in the tunneling barrier gives rise to the Rashba spin-orbit-coupling in the barrier that enables induced p-wave superconductivity in the ferromagnet to exist. We first develop a microscopic theory of Andreev scattering at the spin-orbit-coupled interface, derive a set of self-consistent boundary conditions, and find an expression for the p-wave mini-gap in terms of the microscopic parameters of the contact. Second, we study temperature-dependence of the resistance near the superconducting transition and find that it should generally feature a fluctuation-induced peak. The upturn in resistance is related to the suppression of the singleparticle density of states due to the formation of fluctuating pairs, whose tunneling is suppressed. In conclusion, we discuss this and related setups involving ferromagnetic nanowires in the context of one-dimensional topological superconductors. It is argued that to realize unpaired end Majorana modes, one does not necessarily need a half-metallic state, but a partial spin polarization may suffice. Finally, we propose yet another related class of material systems -ferromagnetic semiconductor wires coupled to ferromagnetic superconductors -where direct realization of Kitaev-Majorana model should be especially straightforward.

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Unconventional Giant “Magnetoresistance” in Bosonic Semiconducting Diamond Nanorings

Zhang

Zulkharnay

et al. 2023

Advanced Materials

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The emergence of superconductivity in doped insulators such as cuprates and pnictides coincides with their doping‐driven insulator–metal transitions. Above the critical doping threshold, a metallic state sets in at high temperatures, while superconductivity sets in at low temperatures. An unanswered question is whether the formation of Cooper pairsin a well‐established metal will inevitably transform the host material into a superconductor, as manifested by a resistance drop. Here, this question is addressed by investigating the electrical transport in nanoscale rings (full loops) and half loops manufactured from heavily boron‐doped diamond. It is shown that in contrast to the diamond half‐loops (DHLs) exhibiting a metal–superconductor transition, the diamond nanorings (DNRs) demonstrate a sharp resistance increase up to 430% and a giant negative “magnetoresistance” below the superconducting transition temperature of the starting material. The finding of the unconventional giant negative “magnetoresistance”, as distinct from existing categories of magnetoresistance, that is, the conventional giant magnetoresistance in magnetic multilayers, the colossal magnetoresistance in perovskites, and the geometric magnetoresistance in semiconductor–metal hybrids, reveals the transformation of the DNRs from metals to bosonic semiconductors upon the formation of Cooper pairs. DNRs like these could be used to manipulate Cooper pairs in superconducting quantum devices.

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Resistance anomaly near the superconducting transition temperature in short aluminum wires

Cited by 125 publications

References 23 publications

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

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

Microscopic theory for a ferromagnetic nanowire/superconductor heterostructure: Transport, fluctuations, and topological superconductivity

Unconventional Giant “Magnetoresistance” in Bosonic Semiconducting Diamond Nanorings

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