Direct correlation between Tc and CuO2 bilayer spacing in YBa2Cu3O7Àx

nd - m at . s up r - co n ] 2 9 A ug 2 00 2 Direct Correlation between Tc and CuO 2 Bilayer Spacing in YBa 2 Cu 3 O 7 − x

Modulated pairs in superconducting cuprates.

H igh-temperature cuprate superconductors are well known to the general science community for the simple reason that their transition temperature, Tc, is much higher than that of other superconductors. Perhaps less well known is the fact that Tc varies dramatically from one family of cuprates to the next. Understanding this dependence of Tc on crystalline structure would obviously be key to des...

Direct observation of optical magnons in YBa2Cu3O6.2.

The unit cell of the high-Tc cuprate YBa2Cu3O61x contains pairs of closely spaced CuO2 layers, the bilayers, separated by CuO chains. Inelastic neutron scattering experiments have demonstrated that electronic states in different CuO2 layers belonging to one bilayer are strongly coupled at all doping levels, whereas the coupling across the chains is much weaker. The nature of this coupling is we...

Signatures of bilayer splitting in the c-axis optical conductivity of double layer cuprates

We report on the infrared studies of the interlayer response for a series of YBa2Cu3Ox high-Tc superconductors with Pr, Ni, and Zn dopants, as well as for the optimally doped crystals of Bi2Sr2CaCu2Oz . These experimental results have motivated us to reexamine some of the long-standing issues in the interlayer electrodynamics of cuprates. Among them are the origins of the anomalous resonance sp...

Photoemission Study of the Intra-unit-cell Coupling in a Trilayer Cuprate

The electronic structures of the nearly optimally doped single-layer, bilayer and trilayer Bi-based cuprates are investigated by angle-resolved photoemission spectroscopy. A lineshape analysis of data taken for different photon energies indicates that the interlayer coupling within the trilayer is not stronger than its counterpart in the bilayer system. This suggests that the higher Tc of the t...