Superconducting/non-superconducting phase boundary in the low temperature tetragonal phase of (La,RE)-Sr-Cu-O

Büchner, B.; Breuer, M.; Cramm, M.; Freimuth, A.; Micklitz, H.; Schlabitz, W.; Kampf, Arno P.

doi:10.1007/bf00754943

Cited by 21 publications

(12 citation statements)

References 13 publications

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“…In the high T c superconductors the thermal conductivity has an electronic and a phononic contribution, κ el and κ ph , respectively [16]. Nevertheless, in the present case the increase of κ below T LT is clearly due to an increase of κ ph : Firstly, the electrical conductivity decreases below T LT [2,5]. According to the Wiedemann-Franz law κ el should then decrease also and the increase of κ = κ ph + κ el must be due to an increase of κ ph .…”

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confidence: 72%

“…2 the thermal conductivity for Eu doped samples (y = 0.15) with Sr contents between 0.05 and 0.22. X-ray diffraction experiments reveal the occurrence of the low temperature structural transition to the LTT phase at T LT ≈ 120K in all these samples [5]. However, the low temperature increase of κ occurs only in the limited Sr concentration range of x ≤ 0.17.…”

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confidence: 88%

“…They are well characterized with various physical properties as described in ref. [2,3,5,12]. The thermal conductivity κ was measured by a standard method for compounds with a wide range of Sr und RE concentrations, x and y, respectively.…”

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confidence: 99%

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Stripe correlations of spins and holes and phonon heat transport in doped La ₂ CuO ₄

et al. 1998

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We present experimental evidence for a dramatic suppression of the phononic thermal conductivity of rare earth and Sr doped La 2 CuO 4 . Remarkably, this suppression correlates with the occurrence of superconductivity. Conventional models for the phonon heat transport fail to explain these results. In contrast, a straightforward explanation is possible in terms of static and dynamic stripe correlations of holes and spins. PACS: 72.15.Eb Electrical and thermal conduction in crystalline metals and alloys 74.62.Dh Effects of crystal defects, doping and substitution 74.72.Dn La-based cuprates Typeset using REVT E X

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confidence: 72%

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Stripe correlations of spins and holes and phonon heat transport in doped La ₂ CuO ₄

et al. 1998

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“…7 Some physical properties of these samples have already been published elsewhere. 5,8 Mössbauer absorption experiments were performed in a liquid He bath cryostat with the La 1.83Ϫx Eu 0.17 Sr x CuO 4 absorber at variable temperature and the 151 SmF 3 source at 4.2 K moving in a sinusoidal mode. Spectra were taken in the temperature range 300 K to 4.2 K for five different La 1.83Ϫx Eu 0.17 Sr x CuO 4 samples ͑x ϭ0, 0.10, 0.17, 0.22, and 0.26͒.…”

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confidence: 99%

Tilting of the CuO6octahedra inLa1.83−<

et al. 1996

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151 Eu Mössbauer studies of La 1.83Ϫx Eu 0.17 Sr x CuO 4 for 0рxр0.26 exhibit a quadrupole interaction at the Eu site whose magnitude eQV zz strongly depends on both the Sr content x and the temperature T. For a fixed temperature, a linear relationship is obtained between the quadrupole interaction and the averaged CuO 6 octahedra tilting angle determined from diffraction studies. The unusually large temperature dependence of eQV zz strongly indicates a temperature dependence of the local structure. In contrast to recent studies of the local structure La 2 CuO 4 -type superconductors by means of x-ray-absorption and neutron-scattering techniques, our data give strong evidence that the local octahedra tilting in La 1.83Ϫx Eu 0.17 Sr x CuO 4 corresponds well to the average tilting obtained by diffraction techniques. ͓S0163-1829͑96͒51726-1͔The tilting of the CuO 6 octahedra occurring in the lowtemperature ͑LT͒ phases of the rare-earth (R) doped high-T c superconductor La 2ϪxϪy R y Sr x CuO 4 results in a buckling of the CuO 2 planes. This buckling seems to be an important parameter with respect to the occurrence of superconductivity in these compounds. It has been shown, for example, that in rare-earth doped La 2Ϫx Sr x CuO 4 there exists a critical tilting angle of the CuO 6 octahedra for the disappearance of superconductivity in the LT tetragonal ͑LTT͒ phase. 1 Usually macroscopic measurements, e.g., x-ray or neutron-diffraction studies, have been used in order to determine the tilting axes and tilting angles of the CuO 6 octahedra and to establish the structural phase diagrams. These techniques measure average structures. The local structure, on the other hand, may be a more important parameter for theories developed to understand the mechanism of high-T c superconductivity. For that reason, techniques for local structure determination are of primary interest in order to check, if average and local structures are equivalent in the cuprates. A hint on pronounced differences in the local and averaged tilting patterns in La 2 CuO 4 based superconductors was obtained from the analysis of the pair distribution function ͑PDF͒ in La 2Ϫx Ba x CuO 4 as reported by Billinge et al. 2 These authors claim that locally the CuO 6 octahedra neither change their tilting angle nor their tilting axis going from the LTT via the LT orthorhombic ͑LTO͒ to the high-temperature tetragonal ͑HTT͒ phase. 2 According to these PDF data the CuO 6 octahedra are always tilted in the ͓110͔ ͑LTT͒ directions and the different average structures result from a coherent superposition of local LTT variants. This picture recently was partially supported by Haskel et al. 3 ͑see also the similar work by Di Cicco and Sperandini 4 ͒ using polarized x-rayabsorption fine-structure ͑XAFS͒ measurements. Again it is claimed that the T-induced structural phase transition from the LTO to the HTT phase in La 2Ϫx Sr x CuO 4 is purely of disorder character, i.e., the local XAFS method does not see a vanishing of the tilting angle of the CuO 6 octahedra at the LTO-...

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“…[59][60][61] Stripe order in LESCO was expected because it has a large LTT regime. 62) In contrast, LSCO was long assumed to have the LTO phase down to low temperature. 63) While dynamic incommensurate spin correlations occur over a broad doping range, 32,64) it was more of a surprise when charge-stripe order was first inferred from nuclear magnetic resonance (NMR) measurements 65,66) and eventually confirmed for x ∼ 0.12 by hard x-ray diffraction.…”

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Superconductivity from charge order in cuprates

Tranquada,

Dean,

2021

Preprint

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Superconductivity in layered cuprates is induced by doping holes into a parent antiferromagnetic insulator. It is now recognized that another common emergent order involves charge stripes, and our understanding of the relationship been charge stripes and superconductivity has been evolving. Here we review studies of 214 cuprate families obtained by doping La 2 CuO 4 . Charge-stripe order tends to compete with bulk superconductivity; nevertheless, there is plentiful evidence that it coexists with two-dimensional superconductivity. This has been interpreted in terms of pair-densitywave superconductivity, and the perspective has shifted from competing to intertwined orders. In fact, a new picture of superconductivity based on pairing within charge stripes has been proposed, as we discuss.

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Superconducting/non-superconducting phase boundary in the low temperature tetragonal phase of (La,RE)-Sr-Cu-O

Cited by 21 publications

References 13 publications

Stripe correlations of spins and holes and phonon heat transport in doped La ₂ CuO ₄

Stripe correlations of spins and holes and phonon heat transport in doped La ₂ CuO ₄

Tilting of the CuO6octahedra inLa1.83−<

Superconductivity from charge order in cuprates

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Superconducting/non-superconducting phase boundary in the low temperature tetragonal phase of (La,RE)-Sr-Cu-O

Cited by 21 publications

References 13 publications

Stripe correlations of spins and holes and phonon heat transport in doped La 2 CuO 4

Stripe correlations of spins and holes and phonon heat transport in doped La 2 CuO 4

Tilting of the CuO6octahedra inLa1.83−<

Superconductivity from charge order in cuprates

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Stripe correlations of spins and holes and phonon heat transport in doped La ₂ CuO ₄

Stripe correlations of spins and holes and phonon heat transport in doped La ₂ CuO ₄