Alex and the Origin of High-Temperature Superconductivity

Egami, T.

doi:10.1007/978-3-319-52675-1_4

Cited by 4 publications

(4 citation statements)

References 66 publications

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“…A characteristic feature of perovskite structures ABO 3 , known as Glazer’s systems, is a variety of tilting effects. , The latter can be caused by external factors, for example, by pressure, by temperature, by a discrepancy between the lattice parameters of a substrate and the material, or by the misfit strain between different layers in complex materials made of stacks of atomic layers. − The unique functionality of several quantum complex materials with perovskite structure, like cuprates, − manganites, , and bismuthates, can be tuned by atomic substitutions, tolerance factor, misfit strain and pressure which control local structural tilts, bond disproportionation, and nanoscale phase separation. A similar complex lattice fluctuations have been identified by extended X-ray absorption fine structure (EXAFS) in BaPb 1– x Bi x O 3 perovskite superconductors showing bond disproportionation and correlated tilts. , …”

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confidence: 99%

Is There Any Hidden Symmetry in the Stripe Structure of Perovskite High-Temperature Superconductors?

Гавричков

Shan’ko

Zamkova

et al. 2019

J. Phys. Chem. Lett.

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Local and fast structural probes using synchrotron radiation have shown nanoscale striped puddles and nanoscale phase separation in doped perovskites. It is known that the striped phases in doped perovskites are due to competing interactions involving charge, spin and lattice degrees of freedom, but while many theoretical models for spin and charge stripes have been proposed we are missing theoretical models describing the complex lattice striped modulations in doped perovskites. In this work we show that two different stripes can be represented as a superposition of a pair of stripes, U (θn) and D(θn), characterized by perovskite tilts where one of the pair is rotated in relation to the other partner by an angle ∆θn = π/2. The spatial distribution of the U and D stripes is reduced to all possible maps in the well-known mathematical four-color theorem. Both the periodic striped puddles and random structures can be represented by using planar graphs with a chromatic number χ 4. To observe the colors in mapping experiments, it is necessary to recover variously oriented tilting effects from the replica. It is established that there is an interplay between the annihilation/creation of new stripes and ordering/disordering tilts in relation to the θn angle in the CuO2 plane, where the characteristic shape of the stripes coincides with the tilting-ordered regions. By their origin, the boundaries between the stripes should be atomically sharp.

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confidence: 99%

Is There Any Hidden Symmetry in the Stripe Structure of Perovskite High-Temperature Superconductors?

Гавричков

Shan’ko

Zamkova

et al. 2019

J. Phys. Chem. Lett.

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“…It is now clear for that the inclusion of lattice instabilities of perovskites [118] and the anisotropic strain [119] is needed to understand the anisotropic multi gap superconductivity in strongly correlated systems. Moreover, today there is a high interest on electron-phonon interaction [43,95] and on lattice heterogeneity as proposed by Alex [120]. A new rapidly developing field is at the crossing point between the research a) on mixed boson-fermion systems in ultracold gases [121] b) shape resonances in multigap superconductivity near Lifshitz transitions in complex heterostructures and c) percolation of filamentary superconductivity in a granular landscape showing mesoscale correlated disorder [105][106] after the accumulated information on complex spatial distribution of defects, strain fluctuations, SDW puddles [122] after many works made in these last ten years [123][124][125][126][127].…”

Section: Discussionmentioning

confidence: 99%

Superconductivity in Quantum Complex Matter: the Superstripes Landscape

Bianconi

2020

J Supercond Nov Magn

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While in XX century the theory of superconductivity has focused on a homogeneous metal with a rigid lattice which can be reduced to a single effective conduction band in the dirty limit. Today in the XXI century, the physics of superconductivity is focusing on complexity of quantum matter where novel quantum functionalities with lattice inhomogeneity at nanoscale (between 1 nm and 100 nm) and at mesoscopic scale (in the range 100-10000 nm), where the electronic structure need to be described by multiple Fermi surfaces and multiple gaps in the superconducting phase in the clean limit. The present issue of Journal of superconductivity and Novel magnetism collects papers presented at the

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“…The true nature and the key role of the complexity at nanoscale in hightemperature superconductors [1][2][3][4][5][6][7][8] and related systems [9] have sparked growing interest in the condensed matter research field, since the discovery of unconventional overdoped perovskites [10,11]. The development of novel synchrotron radiation sources and imaging techniques on the basis of focusing on the X-ray beam down to the nanoscale allow for the visualization of multiscale inhomogeneities of the supramolecular structure [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Scale-Free Distribution of Oxygen Interstitial Wires in Optimum-Doped HgBa2CuO4+y

et al. 2022

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Novel nanoscale probes are opening new venues for understanding unconventional electronic and magnetic functionalities driven by multiscale lattice complexity in doped high-temperature superconducting perovskites. In this work, we focus on the multiscale texture at supramolecular level of oxygen interstitial (O-i) atomic stripes in HgBa2CuO4+y at optimal doping for the highest superconducting critical temperature (TC) of 94 K. We report compelling evidence for the nematic phase of oxygen interstitial O-i atomic wires with fractal-like spatial distribution over multiple scales using scanning micro- and nano-X-ray diffraction. The scale-free distribution of O-i atomic wires at optimum doping extending from the micron down to the nanoscale has been associated with the intricate filamentary network of hole-rich metallic wires in the CuO2 plane. The observed critical opalescence provides evidence for the proximity to a critical point that controls the emergence of high-temperature superconductivity at optimum doping.

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Alex and the Origin of High-Temperature Superconductivity

Cited by 4 publications

References 66 publications

Is There Any Hidden Symmetry in the Stripe Structure of Perovskite High-Temperature Superconductors?

Is There Any Hidden Symmetry in the Stripe Structure of Perovskite High-Temperature Superconductors?

Superconductivity in Quantum Complex Matter: the Superstripes Landscape

Scale-Free Distribution of Oxygen Interstitial Wires in Optimum-Doped HgBa2CuO4+y

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