Bipolaronic charge excitations int−Jtwo-leg ladders
نویسندگان
چکیده
منابع مشابه
Collective density-wave excitations in two-leg Sr14-xCaxCu24O41 ladders.
Raman measurements in the 1.5-20 cm(-1) energy range were performed on single crystals of Sr14-xCaxCu24O41. A quasielastic scattering peak (QEP) which softens with cooling is observed only in the polarization parallel to the ladder direction for samples with x=0, 8, and 12. The QEP is a Raman fingerprint of pinned collective density wave excitations screened by uncondensed carriers in the ladde...
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Low-energy excitations in spin2 antiferromagnetic(AF) Heisenberg spin ladders are studied by bosonization and gauge -theoretical description. The AF Heisenberg models on ladders are described by spin2 fermions and the systems are reduced to relativistic gauge theories of fermions by a mean-field type decoupling and linearization of fermion’s dispersion relation near Fermi points. There gauge fi...
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We study the spin ordering within the three-leg ladders present in the oxyborate Fe3O2BO3 consisting of localized classical spins interacting with conduction electrons (one electron per rung). We also consider the competition with antiferromagnetic superexchange interactions to determine the magnetic phase diagram. Besides a ferromagnetic phase we find (i) a phase with ferromagnetic rungs order...
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The success of models of coupled two-leg spin ladders in describing the magnetic excitation spectrum of La2−xBaxCuO4 had been interpreted previously as evidence for bond-centered stripes. In a recent article, however, we determined the magnetic coupling induced by the charge stripes between bondor site-centered spin stripes modeled by twoor three-leg ladders, respectively. We found that only th...
متن کاملCollective Spin and Charge Excitations in (Sr,La)14−xCaxCu24O41 Quantum Spin Ladders
In 1988, material research focussed around the study of high temperature superconducting copper-oxides brought about new phases of Cu-O based systems, the two-leg spin-ladders (2LL's), that have the general formula (A 1−x A' x) 14 Cu 24 O 41 , with A an alkaline earth metal and A' a trivalent (transition or lanthanoid) metal [1, 2]. There were well-founded hopes that these materials could provi...
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ژورنال
عنوان ژورنال: Physical Review B
سال: 1998
ISSN: 0163-1829,1095-3795
DOI: 10.1103/physrevb.57.2118