LT-STM/STS observations on electrical field etched surfaces of YBa2Cu3O7 −  single crystal

Murakami, Hironaru; Asaoka, Hidehito; Sakai, Kazuo; Ito, Toshimichi; Tonouchi, Masayoshi

doi:10.1016/s0169-4332(01)00047-2

Cited by 6 publications

(5 citation statements)

References 12 publications

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“…The black filled symbols correspond to experimental results obtained by: (a) - M. Sutherland et al [84], (b) - K. Nakayama et al [85], (c) - A. Kaminski et al [86], (d) - M. Plate et al [87], (e) - D.K. Morr et al [88], H.F. Fong et al [89], (f) - N.C. Yeh et al [90], (g) - V. Born et al [91], (h) - H. Murakami et al [92], (i) - H. Edwards et al [93], (j) - H. Edwards et al [94]. The inset shows the dependence of the critical temperature on the hole density estimated from the relation presented in [77].…”

Section: Resultsmentioning

confidence: 99%

Pairing Mechanism for the High-TC Superconductivity: Symmetries and Thermodynamic Properties

Szczȩśniak

2012

PLoS ONE

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The pairing mechanism for the high- superconductors based on the electron-phonon (EPH) and electron-electron-phonon (EEPH) interactions has been presented. On the fold mean-field level, it has been proven, that the obtained s-wave model supplements the predictions based on the BCS van Hove scenario. In particular: (i) For strong EEPH coupling and the energy gap () is very weak temperature dependent; up to the critical temperature extends into the anomalous normal state to the Nernst temperature. (ii) The model explains well the experimental dependence of the ratio on doping for the reported superconductors in the terms of the few fundamental parameters. In the presented paper, the properties of the d-wave superconducting state in the two-dimensional system have been also studied. The obtained results, like for s-wave, have shown the energy gap amplitude crossover from the BCS to non-BCS behavior, as the value of the EEPH potential increases. However, for the energy gap amplitude extends into the anomalous normal state to the pseudogap temperature. Finally, it has been presented that the anisotropic model explains the dependence of the ratio on doping for the considered superconductors.

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Section: Resultsmentioning

confidence: 99%

Pairing Mechanism for the High-TC Superconductivity: Symmetries and Thermodynamic Properties

Szczȩśniak

2012

PLoS ONE

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“…Cleaving predominantly exposes the BiO layer to the surface. However, other surface terminations were occasionally observed by STM (Misra et al, 2002a;Murakami and Aoki, 1995;Pan et al, 1998b). In the following paragraphs, we discuss STM investigations of the BiO and CuO 2 surfaces in greater details.…”

Section: A Surfaces Of Bi-based Cupratesmentioning

confidence: 95%

Scanning tunneling spectroscopy of high-temperature superconductors

et al. 2007

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Tunneling spectroscopy has played a central role in the experimental verification of the microscopic theory of superconductivity in classical superconductors. Initial attempts to apply the same approach to high-temperature superconductors were hampered by various problems related to the complexity of these materials. The use of scanning tunneling microscopy and spectroscopy ͑STM and STS͒ on these compounds allowed the main difficulties to be overcome. This success motivated a rapidly growing scientific community to apply this technique to high-temperature superconductors. This paper reviews the experimental highlights obtained over the last decade. The crucial efforts to gain control over the technique and to obtain reproducible results are first recalled. Then a discussion on how the STM and STS techniques have contributed to the study of some of the most unusual and remarkable properties of high-temperature superconductors is presented: the unusually large gap values and the absence of scaling with the critical temperature, the pseudogap and its relation to superconductivity, the unprecedented small size of the vortex cores and its influence on vortex matter, the unexpected electronic properties of the vortex cores, and the combination of atomic resolution and spectroscopy leading to the observation of periodic local density of states modulations in the superconducting and pseudogap states and in the vortex cores.

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“…The line has been prepared on the basis of the formula (1). The stars and the triangles are the experimental data: (a) Sutherland et al [23], (b) Nakayama et al [24], (c) Kaminski et al [25], (d) Plate et al [26], (e) Morr and Pines [27], Fong et al [28], (f) Yeh et al [29], (g) Born et al [30], (h) Murakami et al [31], (i) Edwards et al [32], (j) Edwards et al [33], (k) Tsai et al [34], (l) Schrieffer and Brooks [35], (m) Maggio-Aprile et al [36,37], (n) Koinuma et al [38], (o) Koyanagi et al [39], (p) Kugler et al [40], (r) Nantoh et al [41,42], (s) Shibata et al [43], Ueno et al [44,45], (t) Kirtley et al [46], (u) Hoevers et al [47], (w) Tanaka et al [48]. data.…”

Section: Modelmentioning

confidence: 99%

On the Ratio of the Energy Gap Amplitude to the Critical Temperature for Cuprates

Szczȩśniak

Durajski

2014

Acta Phys. Pol. A

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The model for the cuprates based on the modified electron-phonon pairing mechanism has been tested. For this purpose, the superconductors with high value of the critical temperature have been taken into consideration. In particular: YBa2Cu3O7−y, HgBa2CuO4+y, HgBa2Cu1−xZnxO4+y, and HgBa2Ca2Cu3O8+y. It has been shown that the dependence of the ratio R1 ≡ 2∆ (0) tot /kBTC on the doping (p) can be properly predicted in the framework of the presented theory; the symbol ∆ (0) tot denotes the energy gap amplitude at the temperature of zero kelvin, and TC is the critical temperature. The numerical results have been supplemented by the formula which describes the function R1(p).

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LT-STM/STS observations on electrical field etched surfaces of YBa2Cu3O7 − single crystal

Cited by 6 publications

References 12 publications

Pairing Mechanism for the High-TC Superconductivity: Symmetries and Thermodynamic Properties

Pairing Mechanism for the High-TC Superconductivity: Symmetries and Thermodynamic Properties

Scanning tunneling spectroscopy of high-temperature superconductors

On the Ratio of the Energy Gap Amplitude to the Critical Temperature for Cuprates

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