Four-Unit-Cell Superstructure in the Optimally Doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">Y</mml:mi><mml:mi mathvariant="normal">B</mml:mi><mml:msub><mml:mi mathvariant="normal">a</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">C</mml:mi><mml:msub><mml:mi mathvariant="normal">u</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>6.92</mml:mn></mml:msub></mml:math>Superconductor

Islam, Zahirul; Liu, X.; Sinha, Sunil K.; Lang, J. C.; Moss, S. C.; Haskel, D.; Srajer, G.; Wochner, P.; Lee, Dong Ryeol; Haeffner, D. R.; Welp, U.

doi:10.1103/physrevlett.93.157008

Cited by 38 publications

(31 citation statements)

References 33 publications

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“…The different periodicity seems to depend on the oxygen doping, as predicted theoretically 24 and supported experimentally by the fact that the undoped compound YBa 2 Cu 4 O 8 does not exhibit diffuse features. 25 However, the picture seems to be more complex and for optimally doped samples ͑O stoichiometry 6.92͒ a four unit cell superstructure, expected near 6.75 stoichiometry, has been observed, 30 and attributed either to phase separation or non-negligible Coulomb interactions. Furthermore, in underdoped compounds the observed diffuse scattering has been interpreted as the presence of charged stripes whose periodicity uses that of the underlying oxygen ordering in the Cu-O chains due to an anomaly in the evolution of the intensity at the pseudogap opening.…”

Section: Introductionmentioning

confidence: 99%

X-ray diffuse scattering experiments from bismuth-based high-Tcsuperconductors

et al. 2006

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A detailed study, by x-ray diffuse scattering, of the recently found two-dimensional ͑2D͒ displacive shortrange-order ͑2DSRO͒ superstructure, with doubled periodicity along the orthorhombic a o direction and perpendicular to the known long-range structural modulation, from the high-T c superconductor Bi 2 Sr 2 CaCu 2 O 8+␦ ͑Bi-2212͒ is reported. The investigation has been extended to high and low temperatures for optimally doped crystals, to crystals with different doping levels, and to the one layer compound Bi 2 Sr 2 CaCu 2 O 6+␦ ͑Bi-2201͒. The results show that the 2DSRO is present at room temperature, for all studied crystals and with the same commensurate 2a o periodicity; significant differences in intensity and in the extent of the 2DSRO are however observed. The most striking feature is that both, the intensity of the diffuse scattering and the extent of the 2DSRO goes through a maximum for the optimal doped crystals and decreases for overdoped and underdoped samples, they are also smaller for the one layer Bi-2201 which has a lower T c . The reversible temperature dependence reveals that the diffuse scattering is unchanged between 35 K and 300 K, but starts washing out for higher temperatures and vanishes around 450 K, temperature above which another scattering, one dimensional in character, is found. This one-dimensional ͑1D͒ short-range order ͑1DSRO͒ corresponds to linear correlated displacements along the pseudotetragonal directions of the Cu-O-Cu chains. These findings tend to show that these short-range ordering features may be of importance for a better understanding of high-T c materials, at least those from the bismuth-based family.

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Section: Introductionmentioning

confidence: 99%

X-ray diffuse scattering experiments from bismuth-based high-Tcsuperconductors

et al. 2006

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“…While such period-4 (aka ortho-IV) oxygen order has, to our knowledge, not been reported in YBCO thin films, it has been observed in bulk YBCO at and above the optimal doping level2425. Like other oxygen orderings, the ortho-IV order persists well above room temperature (up to 500 K) and has a weak temperature dependence, with no anomaly observed at T c .…”

Section: Resultsmentioning

confidence: 58%

Observation of a three-dimensional quasi-long-range electronic supermodulation in YBa2Cu3O7−x/La0.7Ca0.3MnO3 heterostructures

Shafer

Mion

et al. 2016

Nat Commun

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Recent developments in high-temperature superconductivity highlight a generic tendency of the cuprates to develop competing electronic (charge) supermodulations. While coupled with the lattice and showing different characteristics in different materials, these supermodulations themselves are generally conceived to be quasi-two-dimensional, residing mainly in individual CuO2 planes, and poorly correlated along the c axis. Here we observed with resonant elastic X-ray scattering a distinct type of electronic supermodulation in YBa2Cu3O7−x (YBCO) thin films grown epitaxially on La0.7Ca0.3MnO3 (LCMO). This supermodulation has a periodicity nearly commensurate with four lattice constants in-plane, eight out of plane, with long correlation lengths in three dimensions. It sets in far above the superconducting transition temperature and competes with superconductivity below this temperature for electronic states predominantly in the CuO2 plane. Our finding sheds light on the nature of charge ordering in cuprates as well as a reported long-range proximity effect between superconductivity and ferromagnetism in YBCO/LCMO heterostructures.

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“…11 Figure 2 shows the typical butterfly pattern of this elastic distortion that has been observed in neutron scattering measurements of a polaron in the manganite LaMNO 3 and optimally doped YBa 2 Cu 3 O 6 superconductor. 13,14 Such interactions influence the collective behavior or selforganization of a system of polarons or charge distortions in a medium 15 and can affect the behavior of magnetoresistance or superconductivity. 16 The presence of π/4 orientations, where the compressional shear energy or U is zero, leads to twin domain walls oriented at π/4 angles and reflects in 2D the square symmetry of the parent phase in our example.…”

Section: Elastic Compatibility and Domain Structuresmentioning

confidence: 99%

Nanoscale Heterogeneity in Functional Materials

Lookman¹,

Littlewood²

2009

MRS Bull.

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The physical properties that make "functional" materials worthy of their moniker frequently arise because of a phase transition that establishes a new kind of order as the material is cooled from a parent state. Such ordered states include ferroelectrics, ferromagnets, and structurally ordered martensites; because these states all break an orientational symmetry, and it is rare that one can produce the conditions for single domain crystallinity, the observed configuration is generally heterogeneous. However, the conditions under which domain structures form are highly constrained, especially by elastic interactions within a solid; consequently, the observed structures are far from fully random, even if disorder is present. Often the structure of the heterogeneity is important to the function, as in shape-memory alloys. Increasingly, we are surprised to discover new phases inside solids that are themselves a heterogeneous modulation of their parents.

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Four-Unit-Cell Superstructure in the Optimally DopedYBa2Cu3O6.92Superconductor

Cited by 38 publications

References 33 publications

X-ray diffuse scattering experiments from bismuth-based high-Tcsuperconductors

X-ray diffuse scattering experiments from bismuth-based high-Tcsuperconductors

Observation of a three-dimensional quasi-long-range electronic supermodulation in YBa2Cu3O7−x/La0.7Ca0.3MnO3 heterostructures

Nanoscale Heterogeneity in Functional Materials

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