Design for a Room-Temperature Superconductor

Pickett, Warren E.

doi:10.1007/s10948-006-0164-9

Cited by 39 publications

(29 citation statements)

References 38 publications

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“…The study of magnetic phenomena in superconductors and the search for superconductors possessing high critical temperatures (T c ) [1][2][3] require adequate measurement techniques. Direct signatures of superconductivity (diamagnetism and vanishing resistivity) may be complemented by measurements of one or more properties such as local density of states, nuclear magnetism, or heat capacity.…”

Section: Introductionmentioning

confidence: 99%

Diamond magnetometry of superconducting thin films

et al. 2014

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In recent years, diamond magnetometers based on the nitrogen-vacancy (NV) center have been of considerable interest for applications at the nanoscale. An interesting application which is well suited for NV centers is the study of nanoscale magnetic phenomena in superconducting materials. We employ NV centers to interrogate magnetic properties of a thin-layer yttrium barium copper oxide (YBCO) superconductor. Using fluorescence-microscopy methods and samples integrated with an NV sensor on a microchip, we measure the temperature of phase transition in the layer to be 70.0(2) K and the penetration field of vortices to be 46(4) G. We observe pinning of the vortices in the layer at 65 K and estimate their density after cooling the sample in a ∼10-G field to be 0.45(1) μm −2 . These measurements are done with a 10-nm-thick NV layer, so that high spatial resolution may be enabled in the future. Based on these results, we anticipate that this magnetometer could be useful for imaging the structure and dynamics of vortices. As an outlook, we present a fabrication method for a superconductor chip designed for this purpose.

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Section: Introductionmentioning

confidence: 99%

Diamond magnetometry of superconducting thin films

et al. 2014

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“…However, in contrast to what is found in the DQMC, in the ME treatment the depression of T c for λ > λ is associated with the onset of a competing incommensurate CDW order. This distinction is important, since if it were only the competition with CDW order that prevented high T c s, one could "engineer" interactions [2] that suppress CDW order so as to enhance T c .…”

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confidence: 99%

A bound on the superconducting transition temperature

Esterlis¹,

Kivelson²,

Scalapino³

2018

npj Quant Mater

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It is notoriously difficult to make quantitative theoretical predictions of the superconducting transition temperature, Tc, either from first-principles or even from a knowledge of normal state properties. Ultimately, this reflects the fact that the energy scales involved in the superconducting state are extremely small in natural units, and that Tc depends exponentially on a subtle interplay between different interactions so that small uncertainties in microscopic processes can lead to order one effects on Tc. However, in some circumstances, it may be possible to determine (approximate) bounds on Tc. Here we propose such a bound for the conventional phonon-mediated mechanism of pairing with strongly retarded interactions, i.e. in the case in which $$\hbar \bar \omega \ll E_F$$ ℏ ω ¯ ≪ E F , where $$\bar \omega$$ ω ¯ is an appropriate characteristic phonon frequency and EF is the Fermi energy. Specifically, drawing on both empirical results (shown in Fig. 2 below) and recent results1 of determinant quantum Monte Carlo (DQMC) studies of the paradigmatic Holstein model, we propose that $$k_BT_c \le A_{\max }\hbar \bar \omega$$ k B T c ≤ A max ℏ ω ¯ , where Amax is a dimensionless number of order one that we estimate to be Amax ≈ 1/10.

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«Гигантское» Усиление Сверхпроводящего Спаривания В Металлических Нанокластерах: Сильное Увеличение Температуры Перехода И Возможность Сверхпроводимости При Комнатной Температуре

Кресин¹,

Овчинников²

2008

Usp. Fiz. Nauk

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Design for a Room-Temperature Superconductor

Cited by 39 publications

References 38 publications

Diamond magnetometry of superconducting thin films

Diamond magnetometry of superconducting thin films

A bound on the superconducting transition temperature

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