2,858 research outputs found
Stripe Fluctuations, Carriers, Spectroscopies, Transport, and BCS-BEC Crossover in the High-T_c Cuprates
The quasiparticles of the high-T_c cuprates are found to consist of:
polaron-like "stripons" carrying charge, and associated primarily with large-U
orbitals in stripe-like inhomogeneities; "quasielectrons" carrying charge and
spin, and associated with hybridized small-U and large-U orbitals; and
"svivons" carrying spin and lattice distortion. It is shown that this
electronic structure leads to the systematic behavior of spectroscopic and
transport properties of the cuprates. High-T_c pairing results from transitions
between pair states of stripons and quasielectrons through the exchange of
svivons. The cuprates fall in the regime of crossover between BCS and
preformed-pairs Bose-Einstein condensation behaviors.Comment: Latex file, 8 pages (new version including a figure
Stripes, Non-Fermi-Liquid Behavior, and Two-Component Transport in the High-Tc Cuprates
Non-Fermi-liquid features of the high-Tc cuprates, and specifically the
systematic behavior of the resistivity, Hall constant, and thermoelectric
power, are shown to result from an electronic structure based on "large-U" and
"small-U" orbitals, and the resulting striped structure.Comment: 3 pages including 3 figures, Late
Stripe-Like Inhomogeneities, Spectroscopies, Pairing, and Coherence in the High-Tc Cuprates
It is found that the carriers of the high-T_c cuprates are polaron-like
"stripons" carrying charge and located in stripe-like inhomogeneities,
"quasi-electrons" carrying charge and spin, and "svivons" carrying spin and
lattice distortion. This is shown to result in the observed anomalous
spectroscopic properties of the cuprates. The AF/stripe-like inhomogeneities
result from the Bose condensation of the svivon field, and the speed of their
dynamics is determined by the width of the double-svivon neutron-resonance
peak. Pairing results from transitions between pair states of stripons and
quasi-electrons through the exchange of svivons. The obtained pairing symmetry
is of the d_{x^2-y^2} type; however, sign reversal through the charged stripes
results in features not characteristic of this symmetry. The phase diagram is
determined by a pairing and a coherence line, associated with a Mott
transition, and the pseudogap state corresponds to incoherent pairing.Comment: 13 pages, 8 figures; version including recent references, to be
published in J. Phys. Chem. Solid
Stripes, Non-Fermi-Liquid Behavior, and High-Tc Superconductivity
The electronic structure of the high-Tc cuprates is studied in terms of
"large-U" and "small-U" orbitals. A striped structure and three types of
quasiparticles are obtained, polaron-like "stripons" carrying charge, "svivons"
carrying spin, and "quasielectrons" carrying both. The anomalous properties are
explained, and specifically the behavior of the resistivity, Hall constant, and
thermoelectric power. High-temperature superconductivity results from
transitions between pair states of quasielectrons and stripons.Comment: 4 page
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