Superconductivity in PrBa2Cu3O7

Blackstead, Howard A.; Chrisey, Douglas B.; Dow, John D.; Horwitz, J. S.; Klunzinger, A.E.; Pulling, David B.

doi:10.1016/0375-9601(95)00653-k

Cited by 77 publications

(32 citation statements)

References 14 publications

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“…5 A number of models have been proposed for the origin of the anomalous properties of PrBCO and YPrBCO, such as hole filling, 7 hole localization, 8 percolation, 9 magnetic pairbreaking, 7,10,11 magnetic impurity scattering, 12 Pr-O hybridization ͓Fehrenbacher-Rice ͑FR͒ theory͔, 13,14 disorder of Ba site, 15 hole transfer from CuO 2 planes to CuO chains, 16 and mis-substitution effect of Pr atom in Ba site. 17,18 The most commonly accepted one appears to be the Pr-O hybridization, according to which hybridization between Pr 4f and O 2p binds holes primarily from the CuO 2 planes to tetravalent Pr sites, which in turn destroys the superconductivity. 13,14 There is, however, no unified theory that can describe all experimental results, including the nonlinear change in T c with the Pr concentration.…”

Section: Introductionmentioning

confidence: 99%

X-ray spectroscopic study of the electronic structure ofY1−xPrxBa2Cu3
Yamaoka
¹
,
Oohashi
²
,
Jarrige
³

et al. 2008
Phys. Rev. B
20
4
22
0
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We present a detailed investigation of the bulk electronic properties of Y 1−x Pr x Ba 2 Cu 3 O 7 ͑YPrBCO͒ using x-ray absorption spectroscopy in the partial fluorescence yield mode ͑PFY-XAS͒ at Pr L 3 , Ba L 3 , and Cu K edges together with Pr 2p 3/2 3d 5/2 and Cu 1s2p resonant inelastic x-ray scatterings. Pr L 3 PFY-XAS spectra show that Pr is in the mixed-valence state ͑with the valence number slightly greater than 3͒ for the whole x = 0.2-1 range, while the Pr valence decreases with increasing x. The decrease of the Pr 4+ component upon Pr doping, hinting at a weakening Pr-O hybridization, is inconsistent with the scenario according to which the increase in Pr-O hybridization quenches the superconductivity in YPrBCO for x ജ 0.6. It rather suggests that the superconductivity may be suppressed by the total increase of the Pr-related states in the electronic structure due to the Pr ion concentration upon doping. No doping dependence is found in the electronic structure of the Ba and Cu sites, consistent with their invariant environment. No temperature dependence in our data is observed within the experimental accuracy.

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Section: Introductionmentioning

confidence: 99%

X-ray spectroscopic study of the electronic structure ofY1−xPrxBa2Cu3
Yamaoka
¹
,
Oohashi
²
,
Jarrige
³

et al. 2008
Phys. Rev. B
20
4
22
0
View full text Add to dashboard Cite

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“…The same facts also caused us to believe that PrBa 2 Cu 3 O 7 would superconduct [12], which was later show [13,14]. Figure 3 shows fits to the muon penetration depth extracted from µ + SR data and extrapolated to H=0.…”

Section: Charge Transfer In Cupratesmentioning

confidence: 87%

High-temperature superconductivity

Dow¹,

Harshman²

2003

Braz. J. Phys.

Self Cite

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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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“…Blackstead et al [3] present another argument suggesting that, preparing Pr123 by the conventional solid-state method, due to the tendency of Pr to sit on the Ba-site, where it acts as a pair-breaker, therefore destroying SC. Extensive XRD, neutron, and EXAFS [34] allow us to conclude that Pr does not substitute for Ba in Pr123 compound.…”

Section: Discussionmentioning

confidence: 97%

“…The insulating behavior of Pr123 compound in the orthorhombic phase and isostucture with other superconducting (SC) R123 is one of the most studied subjects in recent years [2]. Pr@Ba has been presented the reason for both the insulating Pr123 [3], and the SC Pr123 [4]. There have been many controversies as the reason for the anomalous electronic and magnetic behaviors [5].…”

Section: Introductionmentioning

confidence: 97%

Ba@Pr or Pr@Ba in R123 HTSC – To be or not to be SC

Akhavan

2004

Physica Status Solidi (b)

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In spite of the vast amount of experimental and theoretical knowledge accumulated in HTSC, the nature of the interaction driving charge carriers to form Cooper pairs below T c is still unknown. To elucidate the controversial insulating/SC Pr123, the substitution of Pr at Ba site (Pr@Ba) with Ba at Pr site (Ba@Pr) in R123 is compared and reviewed. This might shed some light on the microscopic origin of HTSC.

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Superconductivity in PrBa2Cu3O7

Cited by 77 publications

References 14 publications

X-ray spectroscopic study of the electronic structure ofY1−xPrxBa2Cu3
Yamaoka
¹
,
Oohashi
²
,
Jarrige
³

et al. 2008
Phys. Rev. B
20
4
22
0
View full text Add to dashboard Cite

X-ray spectroscopic study of the electronic structure ofY1−xPrxBa2Cu3
Yamaoka
¹
,
Oohashi
²
,
Jarrige
³

et al. 2008
Phys. Rev. B
20
4
22
0
View full text Add to dashboard Cite

High-temperature superconductivity

Ba@Pr or Pr@Ba in R123 HTSC – To be or not to be SC

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Superconductivity in PrBa2Cu3O7

Cited by 77 publications

References 14 publications

X-ray spectroscopic study of the electronic structure ofY1−xPrxBa2Cu3Yamaoka1, Oohashi2, Jarrige3 et al. 2008Phys. Rev. B204220View full textAdd to dashboardCite

X-ray spectroscopic study of the electronic structure ofY1−xPrxBa2Cu3Yamaoka1, Oohashi2, Jarrige3 et al. 2008Phys. Rev. B204220View full textAdd to dashboardCite

High-temperature superconductivity

Ba@Pr or Pr@Ba in R123 HTSC – To be or not to be SC

Contact Info

Product

Resources

About

X-ray spectroscopic study of the electronic structure ofY1−xPrxBa2Cu3
Yamaoka
¹
,
Oohashi
²
,
Jarrige
³

et al. 2008
Phys. Rev. B
20
4
22
0
View full text Add to dashboard Cite

X-ray spectroscopic study of the electronic structure ofY1−xPrxBa2Cu3
Yamaoka
¹
,
Oohashi
²
,
Jarrige
³

et al. 2008
Phys. Rev. B
20
4
22
0
View full text Add to dashboard Cite