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We discuss recent elastic neutron scattering and scanning tunneling experiments on high-T
c cuprates exposed to an applied magnetic field. In particular we show that a physical picture consisting of antiferromagnetic vortex cores operating as pinning centers for surrounding stripes is...
Superconducting NdBa2Cu3O7−δ (NBCO) thin films with T
c=89 K have been successfully grown on bare (1
02) sapphire substrates by pulsed laser deposition (PLD). The X-ray diffraction results show that the as-grown NBCO films are all c-axis oriented with no observable second phase....
Zero-field muon-spin-relaxation measurements have been carried out in order to investigate changes of the Cu-spin fluctuations in a wide hole-concentration range of La2−x
CuO4. An increase of the muon-spin depolarization rate with decreasing temperature has been observed between about 70 K...
A mean-field approximation is used to calculate the optical conductivity for the coupled two-chain Hubbard model around quarter filling to simulate the observed data for the CuO double chains of PrBa2Cu4O8. We show that the ∼40 meV peak structure, spectral shape, and small Drude weight observed...
We applied an electron backscatter diffraction (EBSD) technique to determine the texture and individual crystallite orientations on melt-textured and various polycrystalline YBa2Cu3O
(YBCO) samples, doped with several Alkali metal additions (KClO3, K2CO3 and Rb2CO3). The EBSD analysis on...
We have measured the differential conductance of Au/Y1−x
Ba2Cu3O7−δ point contacts in the regime where it is dominated by Andreev reflection, which enhances its value at low bias. We find that the characteristics can not be fitted by a pure d-wave Order Parameter (OP). Using the formalism...
The band structure for Sr2MoO4, which is isostructural with the unconventional spin-triplet superconductor Sr2RuO4, has been calculated within the local-density approximation. The results of the neutron-diffraction structure refinement used in the calculation are also presented. The elecronic...
Magnetism in the vortex core of nearly-optimal doped Tl2Ba2CuO6+δ (T
c=85 K) is investigated by a spatially-resolved NMR. The NMR relaxation rate T
1 at 205Tl site provides a direct evidence of the significant enhancement of the AF spin correlations in the vortex core region and shows clearly...
Muon spectroscopy experiments (μ+SR) on YBa2Cu3O7 have shown since 1987 that the hole-pairing is s-wave rather than d-wave (as claimed in 1994 by Sonier et al.). New data taken for a high-quality crystal in a large applied field of 60 kOe show that the claims of d-wave pairing are invalid and...
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