Structure of superconducting single crystals of 2201 thallium cuprate (Tl1.85Cu0.15)Ba2CuO6, Tc = 110 K

Kolesnikov, N. N.; Korotkov, V. E.; Kulakov, M. P.; Shibaeva, R. P.; Molchanov, V. N.; Tamazyan, R. А.; Simonov, V. I.

doi:10.1016/0921-4534(92)90343-b

Cited by 52 publications

(30 citation statements)

References 21 publications

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“…• or from internal strain fields and an orthorhombic distortion in Tl-2201 [59][60][61] . We note that the orthorhombic distortion is not larger than 1 % and is not enough to explain the leakage.…”

Section: Resultsmentioning

confidence: 99%

Pair breaking versus symmetry breaking: Origin of the Raman modes in superconducting cuprates

et al. 2011

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We performed Raman scattering experiments on superconductivity-induced features in Bi2Sr2(Ca1−xYx)Cu2O 8+δ (Bi-2212), YBa2Cu3O6+x (Y-123), and Tl2Ba2CuO 6+δ (Tl-2201) single crystals. The results in combination with earlier ones enable us to systematically analyze the spectral features in the doping range 0.07 ≤ p ≤ 0.24. In B2g (xy) symmetry we find universal spectra and the maximal gap energy ∆0 to scale with the superconducting transition temperature Tc. The B1g (x 2 − y 2 ) spectra in all three compounds show an anomalous increase of the intensity toward overdoping. The energy scale of the corresponding peak is neither related to the pairing energy nor to the pseudogap, but possibly stems from a symmetry breaking transition at the onset point of superconductivity at psc2 ≃ 0.27.

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Section: Resultsmentioning

confidence: 99%

Pair breaking versus symmetry breaking: Origin of the Raman modes in superconducting cuprates

et al. 2011

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“…Hasegawa et al used reduced thallium precursors and an alumina high-pressure bomb to control thallium loss [36,39]. Kolesnikov et al [40]- [42] do not report any special precautions for controlling the loss of thallium. In our growth effort (see subsection 2.1), we developed a flexible sealing scheme that permits the oxygen to escape as it is evolved, while at the same time containing the Tl 2 O.…”

Section: Tl2201 Single-crystal Preparationmentioning

confidence: 99%

Tl₂Ba₂CuO_6+δbrings spectroscopic probes deep into the overdoped regime of the high-T_ccuprates

Peets¹,

Mottershead²,

Wu³

et al. 2007

New J. Phys.

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Single-particle spectroscopic probes, such as scanning tunneling and angle-resolved photoemission spectroscopy (ARPES), have provided us with crucial insights into the complex electronic structure of the high-T c cuprates, in particular for the under and optimally doped regimes where high-quality crystals suitable for surface-sensitive experiments are available. Conversely, the elementary excitations on the heavily overdoped side of the phase diagram remain largely unexplored. Important breakthroughs could come from the study of Tl 2 Ba 2 CuO 6+δ (Tl2201), a structurally simple system whose doping level can be tuned from optimal to extreme overdoping by varying the oxygen content. Using a self-flux method and encapsulation, we have grown single crystals of Tl2201, which were then carefully annealed under controlled oxygen partial pressures. Their high quality and homogeneity are demonstrated by narrow rocking curves and superconducting transition widths. For higher dopings, the crystals are orthorhombic, a lattice distortion stabilized by O interstitials in the TlO layer. These crystals have enabled the first successful ARPES study of both normal and superconducting-state electronic structure in Tl2201, allowing a direct comparison with the Fermi surface from magnetoresistance and the gap from thermal conductivity experiments. This establishes Tl2201 as the first high-T c cuprate for which a surfacesensitive single-particle spectroscopy and a comparable bulk transport technique have arrived at quantitative agreement on a major feature such as the normal state Fermi surface. The momentum dependence of the ARPES lineshape reveals, however, an unexpected phenomenology: in contrast to the case of under-and optimally-doped cuprates, quasiparticles are sharp near (π, 0), the antinodal region where the gap is maximum, and broad at (π/2, π/2), the nodal region where the gap vanishes. This reversed quasiparticle anisotropy past optimal doping, and its relevance to scattering, many-body, and quantum-critical phenomena in the high-T c cuprates, are discussed.

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“…grown in an air atmosphere inside zirconium dioxide multilayered crucibles 16,17 . Single crystals samples of both materials used in ARPES experiments are of exceptional quality as evidenced by very sharp superconducting transitions with typical widths ∼2-4K shown in Fig.…”

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Origins of large critical temperature variations in single-layer cuprates

et al. 2008

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We study the electronic structures of two single layer superconducting cuprates, Tl2Ba2CuO 6+δ (Tl2201) and (Bi1.35Pb0.85)(Sr1.47La0.38)CuO 6+δ (Bi2201) which have very different maximum critical temperatures (90K and 35K respectively) using Angular Resolved Photoemission Spectroscopy (ARPES). We are able to identify two main differences in their electronic properties. First, the shadow band that is present in double layer and low Tc,max single layer cuprates is absent in Tl2201. Recent studies have linked the shadow band to structural distortions in the lattice and the absence of these in Tl2201 may be a contributing factor in its Tc,max. Second, Tl2201's Fermi surface (FS) contains long straight parallel regions near the anti-node, while in Bi2201 the anti-nodal region is much more rounded. Since the size of the superconducting gap is largest in the anti-nodal region, differences in the band dispersion at the anti-node may play a significant role in the pairing and therefore affect the maximum transition temperature.

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Structure of superconducting single crystals of 2201 thallium cuprate (Tl1.85Cu0.15)Ba2CuO6, Tc = 110 K

Cited by 52 publications

References 21 publications

Pair breaking versus symmetry breaking: Origin of the Raman modes in superconducting cuprates

Pair breaking versus symmetry breaking: Origin of the Raman modes in superconducting cuprates

Tl₂Ba₂CuO_6+δbrings spectroscopic probes deep into the overdoped regime of the high-T_ccuprates

Origins of large critical temperature variations in single-layer cuprates

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Structure of superconducting single crystals of 2201 thallium cuprate (Tl1.85Cu0.15)Ba2CuO6, Tc = 110 K

Cited by 52 publications

References 21 publications

Pair breaking versus symmetry breaking: Origin of the Raman modes in superconducting cuprates

Pair breaking versus symmetry breaking: Origin of the Raman modes in superconducting cuprates

Tl2Ba2CuO6+δbrings spectroscopic probes deep into the overdoped regime of the high-Tccuprates

Origins of large critical temperature variations in single-layer cuprates

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Product

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Tl₂Ba₂CuO_6+δbrings spectroscopic probes deep into the overdoped regime of the high-T_ccuprates