Current-voltage characteristics in Ag/Au nanostructures at resistive transitions

Islam, Saurav; Mahadevu, Rekha; Saha, Subham Kumar; Mahapatra, Phanibhusan S.; Bhattacharyya, Biswajit; Thapa, Dev Kumar; Sai, T. Phanindra; Patil, Satish; Pandey, Anshu; Ghosh, Arindam

doi:10.48550/arxiv.1906.02291

Cited by 3 publications

(11 citation statements)

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“…The four-probe R for 23, 67 (I : 2, 3 and V : 6, 7) and 23, 58 channels were recorded simultaneously in the same thermal cycle, while that for 12, 78 with 45 • rotated lead configuration was measured in a separate cool down. The resistance of the as-prepared films varies from 0.4 − 1.5 Ω across the different regions of the film with corresponding resistivity ≈ 4 − 15 × 10 −8 Ω-m [25]. As evident from Fig.…”

mentioning

confidence: 73%

“…When the sweep rate is decreased, the ERA remains robust but the T C increases considerably, indicating the nanostructure film exists in an out-of-equilibrium state. Our earlier experiments [24,25] indicated that T C in the Ag/Au nanostructures also change with ageing, which may complicate unambiguous determination of the effect of the sweep rate alone. A small 'dip' in R immediately following the peak, observed most clearly for cycles h3−h5, has also been observed at the superconductor to normal transitions in Au 0.7 In 0.3 rings [21] and high-T C Bi 2 Sr 2 CaCu 2 O 8−y films [10] that associates the resistance anomaly to the fluctuation regime [7].…”

Section: Resistance Of mentioning

confidence: 97%

“…The validity of these two criteria may seem unlikely in the Ag/Au nanostructure films. However, recent investigation of the I −V characteristics in these systems have indicated possible formation of PSCs at the resistive transition [25], and attributed to a highly inhomogeneous and filamentary network of superconducting channels. Both resistance anisotropy and the strong spatial dependence of R max /R N ratio (Fig.…”

Section: Resistance Of mentioning

confidence: 99%

“…A transition to vanishingly small electrical resistance state and the concurrent emergence of diamagnetic susceptibility have recently been observed in nanocomposite films of Ag nanoclusters (∼ 1 nm diameter) dispersed on Au matrix close to room temperature, suggesting possible emergence of superconductor-like macroscopic coherence at elevated temperatures [24]. The current (I)-voltage (V ) characteristics in these films near the resistive transition was also reported to exhibit critical current behavior with strong hysteresis and discrete resistance steps [25]. This was attributed to a highly non-equilibrium nature of the quasi-particle transport and filamentary flow of supercurrent through dissipative phase slip centres (PSC) close to the transition.…”

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confidence: 91%

“…The Ag/Au nano-structure films were made by planting Ag nano-particles (∼ 1 nm) into a gold matrix using colloidal technique [24,25,29]. Briefly, silver clusters were prepared by the reduction of silver nitrate in cetyltrimethylammonium bromide with sodium borohydride.…”

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confidence: 99%

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Observation of excess resistance anomaly at resistive transitions in Ag/Au nanostructures

Mahapatra¹,

Saha²,

Mahadevu³

et al. 2019

Preprint

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The resistive transition in nanocomposite films of silver (Ag) nanoclusters of ∼ 1 nm diameter embedded in gold (Au) matrix exhibits an anomalous resistance peak at the onset of the transition, even for transition temperatures as high as 260 K. The maximum value of the resistance ranges between ∼ 30% − 300% above that of the normal state depending on devices as well as lead configuration within a single device. The excess resistance regime was observed in about 10 % of the devices, and extends from ∼ 10 − 100 K. Application of magnetic field of 9 T was found to partially suppress the excess resistance. From the critical current behavior, as well as negative differential resistance in the current-voltage characteristics, we discuss the possibility of interacting phase slip centers and alternate physical scenarios that may cause the excess resistance in our system.

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confidence: 73%

Section: Resistance Of mentioning

confidence: 97%

Section: Resistance Of mentioning

confidence: 99%

mentioning

confidence: 91%

mentioning

confidence: 99%

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Observation of excess resistance anomaly at resistive transitions in Ag/Au nanostructures

Mahapatra¹,

Saha²,

Mahadevu³

et al. 2019

Preprint

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Unconventional properties of engineered Au–Ag nanostructures

Saha¹,

Mondal²,

Vasudeva³

et al. 2022

Supercond. Sci. Technol.

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Au-Ag Nanostructures comprising of ~1 nm Ag nanoparticles embedded into an Au matrix show several unconventional optical, electric and magnetic properties. Here we review progress made towards the preparation of these materials as well as analysis of their structure. Further, electrical and magnetic transitions in these materials are discussed. Finally, we review the properties of these materials as revealed from optical and electron microscopic probes.

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Investigation of the dissipative properties of Au-Ag nanostructures through Electron Energy Loss Spectroscopy

Saha

Mondal

Channagiri

et al. 2022

Preprint

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We describe the unusual dielectric properties of Au-Ag nanostructures at a single particle level using electron energy loss spectroscopy. It has been shown previously that these nanostructures deviate from their usual metallic characteristics of metallic Ag and Au. In particular certain variants of these materials appear to undergo a transition to an immeasurably low resistive state as well as a strong diamagnetic state that is not usually associated with Au and Ag themselves. More significantly these nanostructures exhibit absence of Mie like resonances associated with Au and Ag. Instead, these exhibit negligible optical absorption in the UV-VIS-NIR range. Here this unconventional electromagnetic response was probed at a single particle level. We find that the absence of dissipation is also reflected in the electron loss spectra. The lack of distinct electron energy loss features in particles with a known composition enables us to unambiguously assign these observations to actual particle properties. We tentatively interpret our observations as arising due to a reduction of free electron density in Au and Ag nanostructures. Further it was also shown that the conventional plasmonic modes can be recovered by altering material composition.

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Current-voltage characteristics in Ag/Au nanostructures at resistive transitions

Cited by 3 publications

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Observation of excess resistance anomaly at resistive transitions in Ag/Au nanostructures

Observation of excess resistance anomaly at resistive transitions in Ag/Au nanostructures

Unconventional properties of engineered Au–Ag nanostructures

Investigation of the dissipative properties of Au-Ag nanostructures through Electron Energy Loss Spectroscopy

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