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Misra, Shashank; Oh, Seongshik; Hornbaker, D. J.; Diluccio, T.; Eckstein, J. N.; Yazdani, Ali

doi:10.1103/physrevlett.89.087002

Cited by 46 publications

(38 citation statements)

References 27 publications

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“…However the idea that one has to involve the s-orbitals of the Cu-O plane is relevant also for an exposed Cu-O layer as one would need to tunnel from the s-orbitals of the tip onto relevant s-orbitals of the Cu-O plane (Misra et al, 2002). Alternative filter due to blocking of certain hopping matrix elements has been considered by Zhu et al (Zhu et al, 2000c).…”

Section: Filtermentioning

confidence: 99%

Impurity-induced states in conventional and unconventional superconductors

2006

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We review recent developments in our understanding of how impurities influence the electronic states in the bulk of superconductors. Our focus is on the quasi-localized states in the vicinity of impurity sites in conventional and unconventional superconductors and our goal is to provide a unified framework for their description. The non-magnetic impurity resonances in unconventional superconductors are directly related to the Yu-Shiba-Rusinov states around magnetic impurities in conventional s-wave systems. We review the physics behind these states, including quantum phase transition between screened and unscreened impurity, and emphasize recent work on d-wave superconductors. The bound states are most spectacularly seen in scanning tunneling spectroscopy measurements on high-Tc cuprates, which we describe in detail. We also discuss very recent progress on the states coupled to impurity sites which have their own dynamics, and impurity resonances in the presence of an order competing with superconductivity. Last part of the review is devoted to influence of local deviations of the impurity concentration from its average value on the density of states in s-wave superconductors. We review how these fluctuations affect the density of states and show that s-wave superconductors are, strictly speaking, gapless in the presence of an arbitrarily small concentration of magnetic impurities.

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Section: Filtermentioning

confidence: 99%

Impurity-induced states in conventional and unconventional superconductors

2006

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“…But the work of Klemm [6] and Li [7] provides a convincing demonstration that the superconductivity in Bi 2 Sr 2 CaCu 2 O 8 is s-wave in character, and we have found [8], using the bulk probe of muon spectroscopy, that the superconductivity of YBa 2 Cu 3 O 7 is also s-wave in character with an uncertainty of less than 4×10 −6 . It is exceedingly unlikely that, in the bulk, YBa 2 Cu 3 O 7 could have swave pairing, while Bi 2 Sr 2 CaCu 2 O 8 has d-wave [4] (which cannot be reconciled with other measurements [9]). Hence the better explanation of the facts about the CuO 2 layers of the Illinois group is that they feature a band-gap in the CuO 2 layers, and those layers do not initiate superconductivity.…”

Section: Faulty Evidence For Cuprate-plane Superconductivitymentioning

confidence: 74%

“…Perhaps an independent confirmation of the problem with cuprate-plane superconductivity comes from the scanning tunneling microscopy data on Bi 2 Sr 2 CaCu 2 O 8 of the Illinois group [4,5]. (See Fig.…”

Section: Faulty Evidence For Cuprate-plane Superconductivitymentioning

confidence: 96%

“…1.) This is important to realize because the superconducting layers in most (and perhaps all) high-temperature superconductors are not the cuprate-planes, as was implied by the now-infamous fictitious jump in cuprate-plane Cu charge [3].Perhaps an independent confirmation of the problem with cuprate-plane superconductivity comes from the scanning tunneling microscopy data on Bi 2 Sr 2 CaCu 2 O 8 of the Illinois group [4,5]. (See Fig.…”

mentioning

confidence: 88%

“…4, and the superconductivity sets in [11]. These facts cause us to assign the superconductivity of YBa 2 Cu 3 O 7 to the BaO layers.…”

Section: Charge Transfer In Cupratesmentioning

confidence: 99%

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High-temperature superconductivity

Dow¹,

Harshman²

2003

Braz. J. Phys.

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The widely held notion that high-temperature superconductivity originates in the cuprate-planes is proven to be faulty. In the cuprates such as YBa2Cu3O7, we argue that the superconductivity resides in the BaO layers. This superconductivity is s-wave, not d-wave, in the bulk. The trio of ruthenate compounds, doped Sr 2 YRuO 6 , GdSr2Cu2RuO8, and Gd2−zCezSr2Cu2RuO10 all superconduct in their SrO layers, which is why they have almost the same ∼49 K onset temperatures for superconductivity. Faulty evidence for cuprate-plane superconductivityTwo of the most-cited papers in contemporary physics claim to show that the cuprate-planes of YBa 2 Cu 3 O x superconduct [1,2]. However, there are problems with both papers that have not been well-recognized: (i) the evidence of superconductivity in the cuprate-planes comes from a jump in charge which was evident in the work of Cava et al., but not in the work of Jorgensen et al.; and (ii) the studies of Jorgensen et al. claim to confirm the data of Cava et al., but actually do not in the most important way: Jorgensen does not have the Cava jump. In fact, a closer examination of the data reveals that only one datum is responsible for the jump in charge that is purportedly evidence for cuprate-plane superconductivity, and this datum was not reproduced in the data of Jorgensen et al. or (to our knowledge) elsewhere. This startling fact has been missed by many people because a continuous line was drawn through rather sparse data and conveyed the impression that the data are much denser than they are. In other words, the concept of cuprate-plane superconductivity has not been confirmed and rests on only one unreproduced datum. (See Fig. 1.) This is important to realize because the superconducting layers in most (and perhaps all) high-temperature superconductors are not the cuprate-planes, as was implied by the now-infamous fictitious jump in cuprate-plane Cu charge [3].Perhaps an independent confirmation of the problem with cuprate-plane superconductivity comes from the scanning tunneling microscopy data on Bi 2 Sr 2 CaCu 2 O 8 of the Illinois group [4,5]. (See Fig. 2). The surface layer of this compound, when it is cleaved, is the BiO layer. Underneath that is the SrO layer, and then a CuO 2 plane; after that comes a Ca layer and a second CuO 2 plane. Apparently the Illinois workers have imaged the BiO surface layer, and then a CuO 2 layer that is exposed by a step protruding from the side of the sample, apparently the second CuO 2 layer beneath the surface. An examination of their data reveals that their BiO layer looks like most others, with a U-shaped feature that is indicative of a layer nearby a superconducting layer. But their protruding CuO 2 plane does not look at all like a superconductor, and instead of a U-shaped feature, seems to have a band-gap with no density of states in the gap. The Illinois workers have interpreted their observations as evidence of dwave superconductivity in the cuprate-planes, but this interpretation is based primarily on the facts that (i) the...

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Scanning Tunneling Spectroscopy on High Temperature Superconductors

Fischer

Renner

Maggio-Aprile

NATO Science Series: B:

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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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Atomic Scale Imaging and Spectroscopy of aCuO2Plane at the Surface ofBi
Shashank Misra
¹
,
Seongshik Oh
²
,
D. J. Hornbaker
³

et al.

Cited by 46 publications

References 27 publications

Impurity-induced states in conventional and unconventional superconductors

Impurity-induced states in conventional and unconventional superconductors

High-temperature superconductivity

Scanning Tunneling Spectroscopy on High Temperature Superconductors

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Atomic Scale Imaging and Spectroscopy of aCuO2Plane at the Surface ofBiShashank Misra1, Seongshik Oh2, D. J. Hornbaker3 et al.

Cited by 46 publications

References 27 publications

Impurity-induced states in conventional and unconventional superconductors

Impurity-induced states in conventional and unconventional superconductors

High-temperature superconductivity

Scanning Tunneling Spectroscopy on High Temperature Superconductors

Contact Info

Product

Resources

About

Atomic Scale Imaging and Spectroscopy of aCuO2Plane at the Surface ofBi
Shashank Misra
¹
,
Seongshik Oh
²
,
D. J. Hornbaker
³

et al.