35 research outputs found
The Conductor of Some Special Points in P^2
We describe a way of calculating the conductor of some special points in P^2, which are constructed by complete intersection finite sets of points. As examples, we calculate the conductor of pure configurations in P^2. Furthermore we give a necessary and sufficient condition for a pure configuration to have the Cayley-Bacharach property
Structural analysis of interfacial strained epitaxial BiMnO3 films fabricated by chemical solution deposition
Ferroic quadrupolar ordering in CeCoSi revealed using Co-NMR measurements
A nonmagnetic phase transition at K in the tetragonal system
CeCoSi with a Kramers doublet ground state is reminiscent of an electric
quadrupole ordering, even though its well-separated crystal-electric-field
(CEF) levels are unlikely to acquire higher-order multipole degrees of freedom.
Here, we report Co nuclear magnetic resonance (NMR) studies that are
highly compatible with a ferroic quadrupole ordering below . Changes in
the NMR spectra below suggest that an external magnetic field induces
ferroic Ce dipole moments orthogonal to the field, enabling domain selection in
the nonmagnetic phase. Our findings suggest the presence of a ferroic
-type quadrupole component in CeCoSi and demonstrate that quadrupole
ordering may occur under well-separated CEF levels in tetragonal systems.Comment: 7 pages, 6 figures, 1 tabl
Cyclotron resonance and mass enhancement by electron correlation in KFeAs
Cyclotron resonance (CR) measurements for the Fe-based superconductor
KFeAs are performed. One signal for CR is observed, and is attributed
to the two-dimensional Fermi surface at the point. We found a
large discrepancy in the effective masses of CR [(3.40.05) ( is
the free electron mass)] and de-Haas van Alphen (dHvA) results, a direct
evidence of mass enhancement due to electronic correlation. A comparison of the
CR and dHvA results shows that both intra- and interband electronic
correlations contribute to the mass enhancement in KFeAs.Comment: 5 pages, 4 figure