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Showing 1 to 20 of 78 for “"Cuprates"”.
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Electronic light scattering in the layered cuprates
Light scattering studies of copper oxide superconductors and the parent insulator materials were performed. Dynamics of the copper oxygen planes were probed with plane-polarized photons, whereas plane-plane coupling was probed with the photons polarized perpendicular to the layers. In both cases …
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Phenomenological phase-fluctuation model for the underdoped cuprates
… model for the pseudogap regime of the underdoped cuprates was discussed. The key idea of the phase-fluctuation scenario in the high-T_c superconductors is the notion that the pseudogap observed in a wide variety of experiments arises from phase fluctuations of the superconducting gap. In this …
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Manipulating superconductivity in cuprates with selective ultrafast excitation
… competing order. The superconducting response of cuprates has been found to be sensitive to the position of certain atoms in the unit cell, including the apical oxygen atoms that sit above and below the bilayer of CuO2 planes in YBCO. Selectively driving a c-axis apical oxygen mode (perpendicular …
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Resonant inelastic x-ray scattering from insulating cuprates
Submitted by Elizabeth Kent (eckent2@illinois.edu) on 2012-05-18T18:02:36Z No. of bitstreams: 1 1999_abbamonte.pdf: 3132117 bytes, checksum: 1f60d48ad29b3962a2b0f6de41a62941 (MD5)
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Aspects of spin-charge separation in high Tc cuprates
High Tc, cuprates have a number of features that are anomalous from the point of view of the conventional theory of metals, i.e. the Fermi liquid theory. These include the high Tc itself, the linear resistivity in optimally doped cuprates, the "spin gap" phenomena, and antiferromagnetic …
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New lithium cuprates for the promotion of directed organic transformations
… of a series of bis(amido)- and bis(phosphido)cuprates, and phosphidocopper compounds, many of which are suitable Directed ortho Cupration (DoCu) reagents. Syntheses involving phosphido ligands lead to the isolation of only one lithium cuprate species, Gilman-type [(Cy2P)2CuLi • 2THF], 11, …
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Big data, bigger magnets, and tiny high-temperature superconducting cuprates
This work focuses on high magnetic field studies of the high-temperature cuprate superconductor YBa<sub>2</sub>Cu<sub>3</sub>O<sub>y</sub> (YBCO) and associated data processing. YBCO is of much interest due to its high critical temperature (>90 K) and complex phase diagram containing many exotic …
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STM studies of the nanoscale electronic landscape of the cuprates
… about other inhomogeneous properties of the cuprates and of inhomogeneous materials in general.
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Electronic structure of strongly correlated low-dimensional spin ½ systems: cuprates and vanadates
In the first two chapters we presented the basics of density functional theory and semiempirical LSD+U approximation, which was implemented in the full-potential local-orbital (FPLO) minimal-basis calculation scheme. In the third chapter we tested the implemented version of LSDA+U on 3d …
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The influence of coulomb potential fluctuation on c-axis tunneling in cuprates
… the resistivity along c-axis direction in cuprates, layered high-temperature superconducting materials as a function of temperature. A point-to-point tunneling model is built to describe the tunneling between two CuO2 planes including the in-plane Coulomb interaction. With a general …
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Exploring strongly interacting gapless states : cuprates, pair density waves, and fluctuating superconductivity
We study the physical property of pair density wave (PDW) and fluctuating PDW, and use it to build an effective theory of the strongly interacting pseudogap phase in cuprate high temperature superconductors. In Chapter 2, we study how Fulde-Ferrell state, the simplest form of PDW, responds to …
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The electronic structure of the pair-density-wave (PDW) superconductor in the cuprates
… PDW state that reconciles certain aspects of the cuprates phenomenology is that inherently it has a charge-density-wave (CDW) as a composite order parameter associated with it. The view point of this thesis will be theses two orders are intertwined, the PDW giving birth to the daughter CDW. Many …
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The role of inter-plane interaction in the electronic structure of high Tc cuprates
… modulation-free Pb-doped Bi2212 superconducting cuprates with respect to interlayer coupling done by using the angle-resolved photoemission spectroscopy (ARPES), which is a leading technique in the experimental investigation of the single particle excitations in solids. The results presented in …
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One-Dimensional Quantum Magnets in Cuprates: Single Crystal Growth and Magnetic Heat Transport Studies
This experimental work focusses on the magnetic thermal conductivity, κ_mag, of the one-dimensional two-leg spin ladder system Sr_14Cu_24O_41 and the spin chain system SrCuO_2. These two S = 1/2 antiferromagnetic Heisenberg compounds possess enormous magnetic contributions to the heat transport …
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Cluster Dynamical Mean-Field Theory: Applications to High-Tc Cuprates and to Quantum Chemistry
… We also study the physics of the pseudogap in cuprates. The suppression of density of states near Fermi surface is present in our calculations, which is in qualitative agreement with the experimental data. Finally we discuss the application of dynamical mean-field theory to quantum chemistry. …
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Angle-Resolved Photoelectron Spectroscopy Studies of the Many-Body Effects in the Electronic Structure of High-Tc Cuprates
… in the single-particle excitation spectra of cuprates and relating the ARPES technique to other experimental methods. First, the electronic properties of BSCCO are considered — the superconducting cuprate most studied by surface-sensitive methods. The recent progress in un-derstanding the …
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Resonant soft X-ray studies of charge orders in high-temperature cuprates with energy-resolving transition edge sensors
"The high-temperature superconductivity in cuprates has been intensely studied since 1986; however, many questions still remain unclear even with decades of efforts. The relation between emergent orders, such as charge (stripe) orders, in ""pseudogap"" regime and superconductivity is one of the …
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Supraconductivité d'interface dans des bicouches de Pr[indices inférieurs 2-x]Ce[indice inférieur x]CuO[indice inférieur 4] sous-dopé et de La[indices inférieurs 2-x]Sr[indice inférieur x]CuO[indice inférieur 4] sur-dopé
Les oxydes de cuivre (cuprates) forment une famille de matériaux pouvant, pour certains dopages, présenter de la supraconductivité à haute température de transition (Haut-T[indice inférieur c]). Cette famille est notable en raison des températures de transition supraconductrice record qui y sont …
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Variational study of strongly correlated electronic models
The discovery of high-Tc superconductivity in the cuprates, and the observation that strong correlations are important in connection with these compounds has led to a tremendous interest in understanding the physics of strongly correlated electronic models. In particular the two simplest models for …
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Beyond particles and localities in quantum matters
… cuprate superconductors. The properties of the cuprates that we investigate include the fractional power-law in optical conductivity, the power-law liquid form of the scattering life-time, the violation of the conductivity sum rule, and the appearance of the anomalous dimension for the current. …
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