Transport measurements in granular niobium nitride cermet films

Simon, Robert R.; Dalrymple, B.J.; Vechten, D. Van; Fuller, W. W.; Wolf, S. A.

doi:10.1103/physrevb.36.1962

Cited by 87 publications

(85 citation statements)

References 19 publications

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“…Equation (2.6) can be written for T > Γ in the form Eq. (1.2) that has been observed in a number of experiments (Fujimori et al, 1994;Gerber et al, 1997;Rotkina et al, 2005;Simon et al, 1987), (see, e.g. Fig.…”

Section: Metallic Regimementioning

confidence: 89%

“…Specially prepared granular metals like those considered in Refs. (Abeles et al, 1975;Gerber et al, 1997;Simon et al, 1987) should be the first objects of the application of the theory developed.…”

Section: Logarithmic Temperature Dependence Of the Conductivitymentioning

confidence: 99%

“…In Ref. (Simon et al, 1987) a granular cermet consisting of N b grains in a boron nitride insulating matrix was studied. Again, at small coupling between the grains the temperature dependence of the resistivity exp a/T 1/2 was observed in a very broad interval of temperatures.…”

Section: Logarithmic Temperature Dependence Of the Conductivitymentioning

confidence: 99%

“…Several explanations have been advanced for this striking behavior, but real understanding was achieved only recently (Beloborodov et al, 2005c;Feigel'man and Ioselevich, 2005;Tran et al, 2005;Zhang and Shklovskii, 2004). A most recent incitement to intense and deep study of physics of granular materials was given by the influential works (Gerber et al, 1997;Simon et al, 1987) where a logarithmic dependence of the conductivity σ (T ) σ (T ) = a + b ln T ,…”

Section: Introductionmentioning

confidence: 99%

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Granular electronic systems

et al. 2007

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A granular metal is an array of metallic nano-particles imbedded into an insulating matrix. Tuning the intergranular coupling strength a granular system can be transformed into either a good metal or an insulator and, in case of superconducting particles, experience superconductor-insulator transition. The ease of adjusting electronic properties of granular metals makes them most suitable for fundamental studies of disordered solids and assures them a fundamental role for nanotechnological applications. This Review discusses recent important theoretical advances in the study of granular metals, emphasizing on the interplay of disorder, quantum effects, fluctuations and effects of confinement in formation of electronic transport and thermodynamic properties of granular materials.

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Section: Metallic Regimementioning

confidence: 89%

Section: Logarithmic Temperature Dependence Of the Conductivitymentioning

confidence: 99%

Section: Logarithmic Temperature Dependence Of the Conductivitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Granular electronic systems

et al. 2007

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“…These issues involving inhomogeneities occur not only in the high-T c superconductors, but also in some other granular systems. For example we briefly mention that both underdoped high-T c superconductors [28] and other systems such as NbN [29] show a logarithmic dependence with temperature for the resistance in a magnetic field. Beloborodov et al [30] have mentioned that this logarithmic behavior can occur in granular systems and high-T c superconductors.…”

Section: Some Experiments On Inhomogenous Superconductors and Thoughtmentioning

confidence: 99%

An inhomogeneous Josephson phase in thin-film and high-Tc superconductors

Imry

Strongin

Homes

2008

Physica C: Superconductivity

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In many cases inhomogeneities are known to exist near the metal (or superconductor)-insulator transition, as follows from well-known domain-wall arguments. If the conducting regions are large enough (i.e. when the T = 0 superconducting gap is much larger than the single-electron level spacing), and if they have superconducting correlations, it becomes energetically favorable for the system to go into a Josephson-coupled zero-resistance state before (i.e. at higher resistance than) becoming a "real" metal. We show that this is plausible by a simple comparison of the relevant coupling constants. For small grains in the above sense, the electronic grain structure is washed out by delocalization and thus becomes irrelevant. When the proposed "Josephson state" is quenched by a magnetic field, an insulating, rather then a metallic, state should appear. This has been shown [1] to be consistent with the existing data on oxide materials as well as ultra-thin films. We discuss the Uemura correlations versus the Homes law, and derive the former for the large-grain Josephson array (inhomogenous superconductor) model. The small-grain case behaves like a dirty homogenous metal. It should obey the Homes law provided that the system is in the dirty supeconductivity limit. A speculation why that is typically the case for d-wave superconductors is presented.

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Global and Local Superconductivity in Boron‐Doped Granular Diamond

et al. 2013

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Strong granularity-correlated and intragrain modulations of the superconducting order parameter are demonstrated in heavily boron-doped diamond situated not yet in the vicinity of the metal-insulator transition. These modulations at the superconducting state (SC) and at the global normal state (NS) above the resistive superconducting transition, reveal that local Cooper pairing sets in prior to the global phase coherence.

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Transport measurements in granular niobium nitride cermet films

Cited by 87 publications

References 19 publications

Granular electronic systems

Granular electronic systems

An inhomogeneous Josephson phase in thin-film and high-Tc superconductors

Global and Local Superconductivity in Boron‐Doped Granular Diamond

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