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Jorgensen, J. D.; Beno, M. A.; Hinks, D. G.; Soderholm, L.; Volin, K.J.; Hitterman, R. L.; Grace, J. D.; Schuller, Iván K.; Segre, C. U.; Zhang, Kuilin; Kleefisch, M. S.

doi:10.1103/physrevb.36.3608

Cited by 1,149 publications

(155 citation statements)

References 28 publications

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“…This fact has led most of the proposed microscopic theories to assume a CuO 2 square planar structure. However, for the practical reason of sample quality, some of the most important and defining experiments have been performed on YBa 2 Cu 3 O 7−δ (Y123), which does not have a square lattice, but rather an orthorhombic structure (b/a ≈ 1.015), caused by the presence of a CuO chain layer [1]. This orthorhombicity, according to LDA calculation [2], should result in significant anisotropy in the in-plane electronic structure (this term will be used throughout this paper to refer to the electronic states associated with the CuO 2 plane), making it problematic to compare theories based on a square lattice with experimental data from Y123.…”

mentioning

confidence: 99%

Superconducting Gap and Strong In-Plane Anisotropy in UntwinnedYBa2Cu3O7−
Lu
¹
,
Feng
²
,
Armitage
³

et al. 2001
Phys. Rev. Lett.

164

145

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With significantly improved sample quality and instrumental resolution, we clearly identify in the (π,0) ARPES spectra from YBa2Cu3O6.993, in the superconducting state, the long-sought 'peakdip-hump' structure. This advance allows us to investigate the large a-b anisotropy of the in-plane electronic structure including, in particular, a 50% difference in the magnitude of the superconducting gap that scales with the energy position of the hump feature. This anisotropy, likely induced by the presence of the CuO chains, raises serious questions about attempts to quantitatively explain the YBa2Cu3O 7−δ data from various experiments using models based on a perfectly square lattice.PACS numbers: 74.25.Jb, 74.72.Bk, 79.60.Bm High-temperature superconductivity (HTSC) is intimately related to the CuO 2 plane, which is the only common structural feature in all cuprates. This fact has led most of the proposed microscopic theories to assume a CuO 2 square planar structure. However, for the practical reason of sample quality, some of the most important and defining experiments have been performed on YBa 2 Cu 3 O 7−δ (Y123), which does not have a square lattice, but rather an orthorhombic structure (b/a ≈ 1.015), caused by the presence of a CuO chain layer [1]. This orthorhombicity, according to LDA calculation [2], should result in significant anisotropy in the in-plane electronic structure (this term will be used throughout this paper to refer to the electronic states associated with the CuO 2 plane), making it problematic to compare theories based on a square lattice with experimental data from Y123. Therefore, it is crucial to quantify the effect of orthorhombicity, if any, on the in-plane electronic structure in Y123. The problem is that angle-resolved photoemission spectroscopy (ARPES), being a uniquely powerful tool for this important task, has, until now, not been particularly effective for the study of Y123 [3]. The important 'peak-dip-hump' structure, which is seen routinely in Bi 2 Sr 2 CaCu 2 O 8+δ (Bi2212) [4] has never been observed in Y123. This absence, together with the presence of a surface state [5], raises questions about ARPES data from Y123, and the universality of the superconducting peak in the cuprates.This paper reports a breakthrough in this important issue, made possible by significantly improved sample quality and instrumental resolution. By isolating a surface state peak near the Fermi energy (E F ), we can clearly resolve a 'peak-dip-hump' structure in the ARPES spectra around (π, 0) in Y123 that resembles the superconducting peak observed in Bi2212 [4]. More significantly, we find a strong a-b asymmetry of the in-plane electronic structure, such as the superconducting gap magnitude, which differs by about 50%. We argue that such a strong inplane a-b anisotropy should be taken into account when interpreting experiments performed on Y123.ARPES experiments were carried out at beamline 5-4 at SSRL, which is equipped with a normal-incidencemonochromator and a SCIENTA SES-200 analyzer. Untwinned Y...

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mentioning

confidence: 99%

Superconducting Gap and Strong In-Plane Anisotropy in UntwinnedYBa2Cu3O7−
Lu
¹
,
Feng
²
,
Armitage
³

et al. 2001
Phys. Rev. Lett.

164

145

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“…In Fig. 6 we have transformed the a, b lattice parameters of YBCO from different authors [5,6,22,23] into the shear angle c~--90 ~ which permits comparison with other ferroelastics [24]. It is noteworthy that shear angles as small as 3 min of arc (Fe3BTO13I) or 10 min of arc (Gd2(MoO4)3) can lead to cracking if mutually perpendicular walls meet.…”

Section: ~176mentioning

confidence: 99%

“…the symmetry operations to transform one domain into all others -are given by the symmetry elements lost during the transition. However, the tetragonal-,orthorhombic phase transition of YBazCU3OT_0, occurring at about 700 ~ at ~ 1 bar of oxygen [5], has to some extent a destructive character because it is linked with a chemical reaction involving oxygen loss~ absorption:…”

Section: Introductionmentioning

confidence: 99%

Polarized light and X-ray precession study of the ferroelastic domains of YBa2Cu3O7-?

Schmid

Burkhardt

Wałker

et al. 1988

Z. Physik B - Condensed Matter

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The ferroelastic domains of the orthorhombic phase of YBa2Cu307_ 0 have been observed in polarized light on ceramics and single crystals. By combining polarized light microscopy with the X-ray precession technique, the correlation of the orientation of the orthorhombic a-and b-axes with that of the a-b-plane bireflectance, reflection dichroism, transmission dichroism (at a thickness of about 1 pm), reflection tints generated with compensators and upon uncrossing of polars, as well as the orientation of etch pits has been realized on ferroelastic single domains, bi-domains and more complicated domain patterns. Four ferroelastic orthorhombic domain states have been identified, at variance with former group theoretical considerations, predicting only two states. Ensembles of lamellar domains beyond optical resolution generate strong bireflectance with principal axes rotated by 45 ~ relative to the true a, b-directions.

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“…The Cu(2)(Cu0 2 ) layers adjacent to the Y atoms show a "dimpled" form. By neutron powder diffraction experiments [9,10] it was shown that in the low temperature phase the oxygen vacancies in the Cu(l)layers are ordered and located in j00 sites. Thus, Cu-0 chains are remaining along the b axis.…”

Section: Structures and Microstructuresmentioning

confidence: 99%

Strain Relief Twinning Due to Vacancy Ordering in YBa₂Cu₃O_x

Warlimont¹,

Schrey²,

Tenbrink³

1989

ESOMAT 1989 - Ist European Symposium on Martensitic Transformations in Science and Technology

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Oxygen ordering and the orthorhombic-to-tetragonal phase transition inYBa2Cu3

Cited by 1,149 publications

References 28 publications

Superconducting Gap and Strong In-Plane Anisotropy in UntwinnedYBa2Cu3O7−
Lu
¹
,
Feng
²
,
Armitage
³

et al. 2001
Phys. Rev. Lett.

Superconducting Gap and Strong In-Plane Anisotropy in UntwinnedYBa2Cu3O7−
Lu
¹
,
Feng
²
,
Armitage
³

et al. 2001
Phys. Rev. Lett.

Polarized light and X-ray precession study of the ferroelastic domains of YBa2Cu3O7-?

Strain Relief Twinning Due to Vacancy Ordering in YBa₂Cu₃O_x

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Oxygen ordering and the orthorhombic-to-tetragonal phase transition inYBa2Cu3

Cited by 1,149 publications

References 28 publications

Superconducting Gap and Strong In-Plane Anisotropy in UntwinnedYBa2Cu3O7−Lu1, Feng2, Armitage3 et al. 2001Phys. Rev. Lett.

Superconducting Gap and Strong In-Plane Anisotropy in UntwinnedYBa2Cu3O7−Lu1, Feng2, Armitage3 et al. 2001Phys. Rev. Lett.

Polarized light and X-ray precession study of the ferroelastic domains of YBa2Cu3O7-?

Strain Relief Twinning Due to Vacancy Ordering in YBa2Cu3Ox

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Product

Resources

About

Superconducting Gap and Strong In-Plane Anisotropy in UntwinnedYBa2Cu3O7−
Lu
¹
,
Feng
²
,
Armitage
³

et al. 2001
Phys. Rev. Lett.

Superconducting Gap and Strong In-Plane Anisotropy in UntwinnedYBa2Cu3O7−
Lu
¹
,
Feng
²
,
Armitage
³

et al. 2001
Phys. Rev. Lett.

Strain Relief Twinning Due to Vacancy Ordering in YBa₂Cu₃O_x