Critical temperature modification of low dimensional superconductors by spin doping

Jalkanen, Pasi; Tuboltsev, Vladimir; Virtanen, A.; Arutyunov, K. Yu.; Räisänen, J.; Lebedev, Oleg I.; Tendeloo, Gustaaf Van

doi:10.1016/j.ssc.2007.03.011

Cited by 9 publications

(8 citation statements)

References 29 publications

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“…1: B c ͑0͒ = 10 mT and mean free path ᐉ = 30 nm. The last value is in reasonable agreement with TEM study, 16 revealing grain size ϳ40 nm in a typical aluminum lift-off fabricated nanostructure. One can clearly see that TAPS-based fit provides much smaller effective resistance R ef f ͑T͒ than our simple model considering inhomogeneity of the sample.…”

Section: ͑5͒supporting

confidence: 90%

Experimental limits of the observation of thermally activated phase-slip mechanism in superconducting nanowires

Zgirski

Arutyunov

2007

Phys. Rev. B

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The shape of experimentally observed R͑T͒ transition of thin superconducting wires is analyzed. From theoretical point of view, broadening of the transition in quasi-one-dimensional superconducting channels is typically associated with phase-slip mechanism. It is shown that such interpretation can be misleading if to consider geometrical inhomogeneity and finite dimensions of real samples studied in experiments. The analysis is based on experimental fact that for many superconducting materials the critical temperature depends on the characteristic dimension of a sample: film thickness or wire cross section.

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Section: ͑5͒supporting

confidence: 90%

Experimental limits of the observation of thermally activated phase-slip mechanism in superconducting nanowires

Zgirski

Arutyunov

2007

Phys. Rev. B

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“…First, the corresponding magnetic fields are too small to polarize magnetic moments of any impurities at such values of T . In addition, it is known that aluminum is immune to creation of localized magnetic moments with concentration up to few at % [176]. Second, there is a pronounced diameter dependence, making nMR observable only in thinnest wires.…”

Section: Negative Magneotresistancementioning

confidence: 99%

Superconductivity in one dimension

2008

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Superconducting properties of metallic nanowires can be entirely different from those of bulk superconductors because of the dominating role played by thermal and quantum fluctuations of the order parameter. For superconducting wires with diameters below $ \sim 50$ nm quantum phase slippage is an important process which can yield a non-vanishing wire resistance down to very low temperatures. Further decrease of the wire diameter, for typical material parameters down to $\sim 10$ nm, results in proliferation of quantum phase slips causing a sharp crossover from superconducting to normal behavior even at T=0. A number of interesting phenomena associated both with quantum phase slips and with the parity effect occur in superconducting nanorings. We review recent theoretical and experimental activities in the field and demonstrate dramatic progress in understanding of the phenomenon of superconductivity in quasi-one-dimensional nanostructures.Comment: 62 pages, 47 figures Misprints corrected, several equations are adapted to the experimentally relevant diffusive limi

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“…It should be also noted that superconductivity is a rather “rigid” property with respect to foreign impurities. In particular case of aluminum, several atomic percents of ferromagnetic impurities are required to alter significantly the critical temperature . Summarizing, we do not see any channels of inelastic scattering of electrons capable to severely modify the standard BCS electron‐phonon mechanism in our samples.…”

mentioning

confidence: 67%

Nanoarchitecture: Toward Quantum‐Size Tuning of Superconductivity

Arutyunov

Zavialov

Sedov

et al. 2018

Physica Rapid Research Ltrs

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Quantum confinement is known to affect a nanosized superconductor through quantum‐size variations of the electronic density of states. Here, it is demonstrate that there is another quantum‐confinement mechanism overlooked in previous studies. In particular, it is found that the electron–electron attraction can be enhanced due to quantum‐confinement modifications of electronic wave functions. The superconducting correlations are strengthened by such quantum mechanical effect, which creates a subtle interplay with surface–substrate phonon modifications. The combined effect depends on nanofilm thickness and can be controlled by nanoarchitechture. The calculations are in a reasonable agreement with experiments performed on high‐quality aluminum films. These findings shed light on the long‐standing problem of the size dependence of the critical temperature in low‐dimensional superconductors.

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Critical temperature modification of low dimensional superconductors by spin doping

Cited by 9 publications

References 29 publications

Experimental limits of the observation of thermally activated phase-slip mechanism in superconducting nanowires

Experimental limits of the observation of thermally activated phase-slip mechanism in superconducting nanowires

Superconductivity in one dimension

Nanoarchitecture: Toward Quantum‐Size Tuning of Superconductivity

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