Theory of magnetic short-range order for high-Tc superconductors
نویسندگان
چکیده
منابع مشابه
Magnetic resonant excitations in High-Tc superconductors
More than fifteen years after the high temperature superconductivity discovery, antiferromagnetic (AF) fluctuations pairing mechanism[1] is still highly controversial. However, inelastic neutron scattering (INS) measurements have successfully brought to light the existence of unusual AF excitations that develop below Tc and could be the hallmark of an unexpected spin-1 collective mode, tightly ...
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In underdoped cuprates, Tc is thought to be determined by Cooper pair phase fluctuations because of the small superfluid density ns. Experimentally, Tc is found to scale with ns. The fluctuation-exchange approximation (FLEX) in its standard form fails to predict this behavior of Tc since it does not include phase fluctuations. We therefore extend the FLEX to include them selfconsistently. We pr...
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Using a generalized RPA-type theory we calculate the in-plane anisotropy of the magnetic excitations in hole-doped high-Tc superconductors. Extending our earlier Fermi-liquid-based studies on the resonance peak by inclusion of orthorhombicity we still find two-dimensional spin excitations, however, being strongly anisotropic. This reflects the underlying anisotropy of the hopping matrix element...
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The magnetic excitations in the stripe phase of high-Tc superconductors are investigated in a model of spin ladders which are effectively coupled via charged stripes. Starting from the effective single-triplon model for the isolated spin ladder, the quasi-one-dimensional spin system can be described straightforwardly. Very good agreement is obtained with recent neutron scattering data on La15/8...
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Inelastic neutron scattering was used to study the wave vector- and frequency-dependent magnetic fluctuations in single crystals of superconducting YBa2Cu3O6+x. The spectra contain several important features, including a gap in the superconducting state, a pseudogap in the normal state, and the much-discussed resonance peak. The appearance of the pseudogap determined from transport and nuclear ...
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ژورنال
عنوان ژورنال: Physica B: Condensed Matter
سال: 1997
ISSN: 0921-4526
DOI: 10.1016/s0921-4526(96)00671-0