Electrochemistry of high-temperature superconductors. Challenges and opportunities

McDevitt, John T.; Riley, David R.; Haupt, Steven G.

doi:10.1021/ac00059a002

Cited by 27 publications

(12 citation statements)

References 40 publications

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“…Samples of 11-mercaptoundecanoylferrocene and Tl 1.4 Ba 2 CaCu 2 O 7.0 epoxy encapsulated electrodes were prepared by literature methods. , In order to prepare a fresh HTSC surface, the Tl 1.4 Ba 2 CaCu 2 O 7.0 epoxy encapsulated electrodes were cleaved with a razor blade prior to each use. Absolute ethanol was purchased from Midwest Grain Products, Pekin, IL.…”

Section: Methodsmentioning

confidence: 99%

Do Alkanethiols Adsorb onto the Surfaces of Tl−Ba−Ca−Cu−O-Based High-Temperature Superconductors? The Critical Role of H₂O Content on the Adsorption Process

Chen¹,

Xu²,

Mirkin³

et al. 1996

Langmuir

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The reactivity of Tl1.4Ba2CaCu2O7.0, a high-temperature superconductor (HTSC), toward a redox-active adsorbate molecule with thiol functionality has been investigated as a function of solvent type and H2O content. Previously it had been reported that alkanethiols do not stably chemisorb onto the surface of Tl2Ba2CaCu2O8/Tl2Ba2Ca2Cu3O10 phases, bringing into question the generality of alkanethiol adsorption onto cuprate-based HTSCs. Herein, we show that under rigorously dry conditions, 11-mercaptoundecanoylferrocene (1) adsorbs cleanly onto the surface of Tl1.4Ba2CaCu2O7.0 to form moderately stable, redoxactive monolayer films. The redox activity of 1 was used to estimate adsorbate surface coverage, and it is shown that the addition of H2O to the modifying solutions of 1 adversely affects the monolayer adsorption process. No redox activity associated with 1 could be detected for electrodes soaked in 0.1 M solutions of 1 with 5% H2O in ethanol, which was attributed to the formation of a BaCO3 corrosion layer that prohibited the adsorption of 1 onto the HTSC surface. The importance of sample stoichiometry on the adsorption process also is discussed.

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Section: Methodsmentioning

confidence: 99%

Do Alkanethiols Adsorb onto the Surfaces of Tl−Ba−Ca−Cu−O-Based High-Temperature Superconductors? The Critical Role of H₂O Content on the Adsorption Process

Chen¹,

Xu²,

Mirkin³

et al. 1996

Langmuir

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“…Pioneering work in the field of electrolyte-based HTS-FET devices was in fact done in the 1990s by McDevitt and collaborators [30][31][32][33][34][35][36][37][38][39]. In their comprehensive studies, they reported detailed electrochemical characterization of the double-layer parameters.…”

Section: Electrolyte-superconductor Field-effect Transistormentioning

confidence: 99%

Insights from the study of high-temperature interface superconductivity

Pereiro

Bollinger

Логвенов

et al. 2012

Phil. Trans. R. Soc. A.

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A brief overview is given of the studies of high-temperature interface superconductivity based on atomic-layer-by-layer molecular beam epitaxy (ALL-MBE). A number of difficult materials science and physics questions have been tackled, frequently at the expense of some technical tour de force, and sometimes even by introducing new techniques. ALL-MBE is especially suitable to address questions related to surface and interface physics. Using this technique, it has been demonstrated that high-temperature superconductivity can occur in a single copper oxide layer-the thinnest superconductor known. It has been shown that interface superconductivity in cuprates is a genuine electronic effect-it arises from charge transfer (electron depletion and accumulation) across the interface driven by the difference in chemical potentials rather than from cation diffusion and mixing. We have also understood the nature of the superconductorinsulator phase transition as a function of doping. However, a few important questions, such as the mechanism of interfacial enhancement of the critical temperature, are still outstanding.

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“…This solid-state approach has been tried on cuprates in the past using traditional top gating, back gating, and even ferroelectric gating, but the shifts in T c that could be induced by field were relatively small 26 . A more powerful alternative is provided by electrolyte gating, as was demonstrated in a series of thorough studies begun two decades ago by McDevitt and collaborators [27][28][29][30][31][32][33][34][35] , who were able to induce shifts in critical temperatures exceeding 50 K. Unfortunately, this large body of pioneering work was somehow overlooked by the broader HTS community (admittedly, including ourselves) and this advance had to be rediscovered.The fabrication of a superconducting field effect transistor is beset by at least two difficult technical problems compared to semiconductors 26 . The first is that is that the dielectric screening length along the c-axis in LSCO is (6 ± 2) Å, about one-half the c-axis lattice constant 20 .…”

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Atomic-layer engineering of oxide superconductors

et al. 2012

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Molecular beam epitaxy technique has enabled synthesis of atomically smooth thin films, multilayers, and superlattices of cuprates and other complex oxides. Such heterostructures show high temperature superconductivity and enable novel experiments that probe the basic physics of this phenomenon. For example, it was established that high temperature superconductivity and anti-ferromagnetic phases separate on Ångström scale, while the pseudo-gap state apparently mixes with high temperature superconductivity over an anomalously large length scale (the "Giant Proximity Effect"). We review some recent experiments on such films and superlattices, including X-ray diffraction, atomic force microscopy, angle-resolved time of flight ion scattering and recoil spectroscopy, transport measurements, highresolution transmission electron microscopy, resonant X-ray scattering, low-energy muon spin resonance, and ultrafast photo-induced reflection high energy electron diffraction. The results include an unambiguous demonstration of strong coupling of in-plane charge excitations to out-of-plane lattice vibrations, a discovery of interface high temperature superconductivity that occurs in a single CuO 2 plane, evidence for local pairs, and establishing tight limits on the temperature range of superconducting fluctuations.Keywords: superconductivity, cuprates, interface, superlattice, field effect ATOMIC LAYER BY LAYER MOLECULAR BEAM EPITAXYTransition metal oxides have received a great deal of recent interest due to the wealth of electronic phases that can be observed in these materials, such as multiferroicity, high-temperature superconductivity (HTS), and high mobility electron gases 1 . The underlying cause of this variety of behaviors is the strongly correlated electrons that reside in the d-orbitals of these systems. At interfaces between two such oxides the competition between different states can lead to an even wider range of phenomena than is observed in the constituent materials alone 2 . A technical hurdle to studying these interesting oxide compounds and interfaces is that the synthesis of these chemically complex materials is typically not easily achieved. We overcome this problem by employing custom-built molecular beam epitaxy systems that allow for atomic-layer-by-layer synthesis with a high degree of control over film growth [3][4][5][6] . Molecular beam epitaxy (MBE) is an ultra-high vacuum technique for deposition of thin films, typically from resistively heated thermal evaporation sources (Knudsen cells) although electron-beam sources can be used as well for refractory materials. MBE sources can be shuttered and if the system is equipped with some monitoring tools that allow for an accurate control of absolute deposition rates of respective metals, one may achieve atomic-layer-by-layer (ALL) growth. The deposition process must be controlled very accurately, at the level of one percent of an atomic monolayer or better. The BNL molecular beam epitaxy system shown in Fig. 1 is equipped with sixteen sources, ...

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Electrochemistry of high-temperature superconductors. Challenges and opportunities

Abstract: The discovery in 1986 of high-temperature superconductivity in Lax 85Ba0.X5Cu04 (Tc = 30-35 K) was thought by many to be the beginning of a new era in which cuprate superconductors would find widespread

Cited by 27 publications

References 40 publications

Do Alkanethiols Adsorb onto the Surfaces of Tl−Ba−Ca−Cu−O-Based High-Temperature Superconductors? The Critical Role of H₂O Content on the Adsorption Process

Do Alkanethiols Adsorb onto the Surfaces of Tl−Ba−Ca−Cu−O-Based High-Temperature Superconductors? The Critical Role of H₂O Content on the Adsorption Process

Insights from the study of high-temperature interface superconductivity

Atomic-layer engineering of oxide superconductors

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Electrochemistry of high-temperature superconductors. Challenges and opportunities

Abstract: The discovery in 1986 of high-temperature superconductivity in Lax 85Ba0.X5Cu04 (Tc = 30-35 K) was thought by many to be the beginning of a new era in which cuprate superconductors would find widespread

Cited by 27 publications

References 40 publications

Do Alkanethiols Adsorb onto the Surfaces of Tl−Ba−Ca−Cu−O-Based High-Temperature Superconductors? The Critical Role of H2O Content on the Adsorption Process

Do Alkanethiols Adsorb onto the Surfaces of Tl−Ba−Ca−Cu−O-Based High-Temperature Superconductors? The Critical Role of H2O Content on the Adsorption Process

Insights from the study of high-temperature interface superconductivity

Atomic-layer engineering of oxide superconductors

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Product

Resources

About

Do Alkanethiols Adsorb onto the Surfaces of Tl−Ba−Ca−Cu−O-Based High-Temperature Superconductors? The Critical Role of H₂O Content on the Adsorption Process

Do Alkanethiols Adsorb onto the Surfaces of Tl−Ba−Ca−Cu−O-Based High-Temperature Superconductors? The Critical Role of H₂O Content on the Adsorption Process