Atomic Stripe Formation in Infinite-Layer Cuprates

Krockenberger, Yoshiharu; Ikeda, Ai; Yamamoto, Hideki

doi:10.1021/acsomega.1c01720

Cited by 11 publications

(19 citation statements)

References 64 publications

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“…NPS shows that intertwined and interlocked nanoscale lattice structures form heterostructures at the atomic limit [13]. This induces the emergence of novel functionalities, such as high-temperature superconductivity, in complex quantum materials as organics [13][14][15][16][17][18][19][20], doped perovskites [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39], iron-based superconductors [40][41][42][43][44], chargedensity-wave materials [45][46][47][48][49][50][51][52], manganites showing colossal magnetoresistance [53][54][55][56][57], doped diborides [58][59]…”

Section: Introductionmentioning

confidence: 99%

Functional Nanoscale Phase Separation and Intertwined Order in Quantum Complex Materials

Campi

Bianconi

2021

Condensed Matter

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Nanoscale phase separation (NPS), characterized by particular types of correlated disorders, plays an important role in the functionality of high-temperature superconductors (HTS). Our results show that multiscale heterogeneity is an essential ingredient of quantum functionality in complex materials. Here, the interactions developing between different structural units cause dynamical spatiotemporal conformations with correlated disorder; thus, visualizing conformational landscapes is fundamental for understanding the physical properties of complex matter and requires advanced methodologies based on high-precision X-ray measurements. We discuss the connections between the dynamical correlated disorder at nanoscale and the functionality in oxygen-doped perovskite superconducting materials.

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Section: Introductionmentioning

confidence: 99%

Functional Nanoscale Phase Separation and Intertwined Order in Quantum Complex Materials

Campi

Bianconi

2021

Condensed Matter

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“…010) anti-site boundary defects are observed [36]. Such defects are most likely triggered by charge imbalances caused by local defects [3,9,36]. The insertion of Ca 2 Fe 2 O 5 layers increases the degree of cation ordering in IL-CaCuO 2 .…”

Section: Resultsmentioning

confidence: 97%

“…Unlike anionic defects, cationic defect formation can be easily traced by STEM imaging. 010) anti-site boundary defects are observed [36]. Such defects are most likely triggered by charge imbalances caused by local defects [3,9,36].…”

Section: Resultsmentioning

confidence: 99%

“…Instead, the presence of oxygen vacancies on the CuO 2 planes in IL cuprates have been suggested for electrondoped IL-cuprates by R 3+ -substitution [48] and elimination of such defects by the irradiation of atomic oxygen down to T ox is necessary for the induction of superconductivity [23]. Although high-resolution insitu scanning tunneling microscopy study pointed out a buckling of CuO 2 planes in non-superconducting IL-SrCuO 2 rather than oxygen vacancies, it was shown that post-annealing under ultra-high vacuum results in a removal of oxygen ions and formation of stripe defects [49] which is distinct from cationic stripe formation found in IL-CaCuO 2 , Ca 1−x R x CuO 2 , and Ca 1−x Sr x CuO 2 [36]. Such defects are hard to detect even with high-resolution STEM technique because they usually exist as random point defects.…”

Section: Direct Comparison Of Structural Imaging Data Between [(Il-mentioning

confidence: 96%

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Superconductivity in infinite-layer CaCuO2-brownmillerite Ca2Fe2O5 superlattices

Ikeda¹,

Krockenberger²,

Taniyasu³

et al. 2021

Preprint

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High-temperature cuprate superconductors have naturally a superlattice structure. Infinite-layer CaCuO2 is the common ingredient of cuprates with superconducting transition temperatures above 100 K. However, infinite-layer CaCuO2 by itself does not superconduct. Here we show that superconductivity emerges in artificial superlattices built from infinite-layer CaCuO2 and brownmillerite Ca2Fe2O5 grown by molecular beam epitaxy. X-ray diffraction and electron microscopy characterizations showed that the crystal quality of the infinite-layer CaCuO2 in the superlattices significantly improved compared to bare thin-films of CaCuO2. We found that the induction of superconductivity in [( CaCuO2)n(Ca2Fe2O5)m] N superlattices is also subject to the oxidizing environment used during the cool-down procedure and therefore to a minimization of oxygen vacancies within the CuO2 planes. The inserted Ca2Fe2O5 layers buffer charge imbalances triggered by point defect formation during growth, minimizing cationic defects in the infinite-layer CaCuO2 layers thus stabilizing monolithic infinite-layer CaCuO2 slabs; embedding CaCuO2 within a superlattice enables extended two-dimensional CuO2 planes and therefore superconductivity while Ca2Fe2O5 serves similar to the charge-reservoir layers in the cuprate superconductors synthesized from incongruent melts.

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“…Bilayers of atomic cuprate oxide superconductors appear to be not less interesting. While the lattice parameter and aperiodic local lattice distortions associated with variable microstrain are not a key physical parameter either in BCS and unconventional superconductivity theories, a compelling evidence for the key role of CuO 2 lattice in the mechanism of high-temperature superconductivity and charge density wave (CDW) phenomena in cuprate perovskites has been reported [7][8][9][10][11] . These findings confirm early experimental results provided by local and fast experimental methods based on the use of synchrotron X-ray radiation [12][13][14][15][16] pointing toward the relevant role of the micro-strain in superconducting cuprate perovskites 17,18 .…”

Section: Introductionmentioning

confidence: 99%

Moir{é}-like superlattice generated van Hove singularities in strained CuO$_2$ double layer

Sboychakov¹,

Kugel²,

Bianconi³

2022

Preprint

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While it is known that the double-layer Bi2Sr2CaCu2O8+y (BSCCO) cuprate superconductor exhibits an incommensurate superlattice (IS), the effect of IS on the electronic structure remains elusive. The interlayer interaction produces a double-peaked van Hove singularity (VHS) in the density of states (called bilayer splitting) which is strongly changed by the incommensurate period of the superlattice controlled by the misfit strain between different atomic layers in BSCCO. Recently the wave vector q = ǫb (where b is the reciprocal lattice vector of the average lattice) of the superlattice in a high-quality single crystal has been measured with high precision [N. Poccia et al., Phys. Rev. Materials 4, 114007 (2020)]. This work reports the calculation of the VHS bilayer splitting in a quasi-commensurate phase with a rational number ǫ = 9/43 for the pure BSCCO crystal. We extend the calculation to the devil's staircase observed in the high entropy perovskite Bi2Sr2Ca1−xYxCu2O8+y (BSCYCO), where the wave vector ǫ = 9/η changes in the range 36 > η > 43 for 1 > x > 0 controlled by the lattice misfit strain. Our results are of high relevance where the chemical potential is tuned in the optimum and overdoped regime where the superconductor to metal transition takes place. The similarity of the complex VHS splitting due to the devil's staircase in mismatched CuO2 bilayer with VHS due to moiré lattice in strained twisted graphene. This makes mismatched CuO2 bilayer quite promising for constructing quantum devices with tuned physical characteristics.

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Atomic Stripe Formation in Infinite-Layer Cuprates

Cited by 11 publications

References 64 publications

Functional Nanoscale Phase Separation and Intertwined Order in Quantum Complex Materials

Functional Nanoscale Phase Separation and Intertwined Order in Quantum Complex Materials

Superconductivity in infinite-layer CaCuO2-brownmillerite Ca2Fe2O5 superlattices

Moir{é}-like superlattice generated van Hove singularities in strained CuO$_2$ double layer

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