Interplay of Externally Doped and Thermally Activated Holes in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>La</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>CuO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>and Their Impact on the Pseudogap Crossover

Gor’kov, L. P.; Teǐtel'Baum, G. B.

doi:10.1103/physrevlett.97.247003

Cited by 82 publications

(58 citation statements)

References 27 publications

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“…51. The number of itinerant holes δ is related to n as δ = 1 − n. In general, the relationship between n and δ could be more complicated 7 , however, for the present considerations such corrections are not of principal importance.…”

Section: Discussionmentioning

confidence: 99%

Intrinsic arrested nanoscale phase separation near a topological Lifshitz transition in strongly correlated two-band metals

Bianconi¹,

Poccia²,

Sboychakov³

et al. 2015

Supercond. Sci. Technol.

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The arrested nanoscale phase separation in a two-band Hubbard model for strongly correlated charge carriers is shown to occur in a particular range in vicinity of the topological Lifshitz transition, where the Fermi energy crosses the bottom of the narrow band and a new sheet of the Fermi surface related to the charge carriers of the second band comes into play. We determine the phase separation diagram of this two-band Hubbard model as a function of two variables, the charge carrier density and the energy shift between the chemical potential and the bottom of the second band. In this phase diagram, we first determine a line of quantum critical points for the Lifshitz transition and find criteria for the electronic phase separation resulting in an inhomogeneous charge distribution. Finally, we identify the critical point in presence of a variable long-range Coulomb interaction where the scale invariance of the coexisting phases with different charge densities appears. We argue that this point is relevant for the regime of scale invariance of the nanoscale phase separation in cuprates like it was first observed in La2CuO4.1.

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Section: Discussionmentioning

confidence: 99%

Intrinsic arrested nanoscale phase separation near a topological Lifshitz transition in strongly correlated two-band metals

Bianconi¹,

Poccia²,

Sboychakov³

et al. 2015

Supercond. Sci. Technol.

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“…In some high-T c cuprates, a similar increase of n(T) was interpreted as the thermal activation of holes due to a van Hove singularity in the density of states [15]. Thus, the activation behavior may indicate that the density of states has a peak structure within 54 meV from Fermi energy.…”

Section: (B)mentioning

confidence: 97%

Hall coefficient and H _c2 in underdoped LaFeAsO _0.95 F _0.05

et al. 2008

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The electrical resistivity and Hall coefficient of LaFeAsO 0.95 F 0.05 polycrystalline samples were measured in pulsed magnetic fields up to 0 H = 60 T from room temperature to 1.5 K. The resistance of the normal state shows a negative temperature coefficient (d /dT < 0) below 70 K for this composition, indicating insulating ground state in underdoped LaFeAsO system in contrast to heavily doped compound. The charge carrier density obtained from Hall effect can be described as constant plus a thermally activated term with an energy gap E = 630 K. Upper critical field, H c2 , estimated from resistivity measurements, exceeds 75 T with zero-field T c = 26.3 K, suggesting an unconventional nature for superconductivity.

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“…Our quantitative results should be tested against theories of composite, granular superconductors proposed for cuprates (10,14,15,25,(30)(31)(32)(55)(56)(57)(58)(59)(60)(61)(62). The X-ray data indicate that these theories must take into account not only the usual superconducting proximity effects, but also the effects of the strains the two components exert on each other.…”

Section: Discussionmentioning

confidence: 99%

“…Our recent discovery (12) that better superconductivity appears with "optimal inhomogeneity" (26) of oxygen defect (Oi) ordering opens the question of the nature of the remaining disordered medium, the topic of the present paper. The separation into an ordered network and a strained embedding medium provides a basis for the two electronic components (27)(28)(29) which have been proposed as the key feature for certain theories of high temperature superconductivity (30)(31)(32).…”

mentioning

confidence: 99%

Optimum inhomogeneity of local lattice distortions in La ₂ CuO _{4+
y}

Poccia

Ricci

Campi

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

113

140

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Electronic functionalities in materials from silicon to transition metal oxides are, to a large extent, controlled by defects and their relative arrangement. Outstanding examples are the oxides of copper, where defect order is correlated with their high superconducting transition temperatures. The oxygen defect order can be highly inhomogeneous, even in optimal superconducting samples, which raises the question of the nature of the sample regions where the order does not exist but which nonetheless form the "glue" binding the ordered regions together. Here we use scanning X-ray microdiffraction (with a beam 300 nm in diameter) to show that for La 2 CuO 4þy , the glue regions contain incommensurate modulated local lattice distortions, whose spatial extent is most pronounced for the best superconducting samples. For an underdoped single crystal with mobile oxygen interstitials in the spacer La 2 O 2þy layers intercalated between the CuO 2 layers, the incommensurate modulated local lattice distortions form droplets anticorrelated with the ordered oxygen interstitials, and whose spatial extent is most pronounced for the best superconducting samples. In this simplest of high temperature superconductors, there are therefore not one, but two networks of ordered defects which can be tuned to achieve optimal superconductivity. For a given stoichiometry, the highest transition temperature is obtained when both the ordered oxygen and lattice defects form fractal patterns, as opposed to appearing in isolated spots. We speculate that the relationship between material complexity and superconducting transition temperature T c is actually underpinned by a fundamental relation between T c and the distribution of ordered defect networks supported by the materials. granular superconductors | multiband superconductivity in density wave metals | scale-free heterogeneity | imaging phase separation | X-ray illumination

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Interplay of Externally Doped and Thermally Activated Holes inLa2−xSrxCuO4and Their Impact on the Pseudogap Crossover

Cited by 82 publications

References 27 publications

Intrinsic arrested nanoscale phase separation near a topological Lifshitz transition in strongly correlated two-band metals

Intrinsic arrested nanoscale phase separation near a topological Lifshitz transition in strongly correlated two-band metals

Hall coefficient and H _c2 in underdoped LaFeAsO _0.95 F _0.05

Optimum inhomogeneity of local lattice distortions in La ₂ CuO _{4+
y}

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Interplay of Externally Doped and Thermally Activated Holes inLa2−xSrxCuO4and Their Impact on the Pseudogap Crossover

Cited by 82 publications

References 27 publications

Intrinsic arrested nanoscale phase separation near a topological Lifshitz transition in strongly correlated two-band metals

Intrinsic arrested nanoscale phase separation near a topological Lifshitz transition in strongly correlated two-band metals

Hall coefficient and H c2 in underdoped LaFeAsO 0.95 F 0.05

Optimum inhomogeneity of local lattice distortions in La 2 CuO 4+ y

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Product

Resources

About

Hall coefficient and H _c2 in underdoped LaFeAsO _0.95 F _0.05

Optimum inhomogeneity of local lattice distortions in La ₂ CuO _{4+
y}