70 research outputs found
Searching for the Slater Transition in the Pyrochlore CdOsO with Infrared Spectroscopy
Infrared reflectance measurements were made on the single crystal pyrochlore
CdOsO in order to examine the transformations of the
electronic structure and crystal lattice across the boundary of the metal
insulator transition at . All predicted IR active phonons are
observed in the conductivity over all temperatures and the oscillator strength
is found to be temperature independent. These results indicate that charge
ordering plays only a minor role in the MIT and that the transition is strictly
electronic in nature. The conductivity shows the clear opening of a gap with
. The gap opens continuously, with a temperature
dependence similar to that of BCS superconductors, and the gap edge having a
distinct dependence. All of these
observables support the suggestion of a Slater transition in CdOsO.Comment: 4 pages, 4 figure
Two-dimensional Schr\"odinger Hamiltonians with Effective Mass in SUSY Approach
The general solution of SUSY intertwining relations of first order for
two-dimensional Schr\"odinger operators with position-dependent (effective)
mass is built in terms of four arbitrary functions. The procedure of separation
of variables for the constructed potentials is demonstrated in general form.
The generalization for intertwining of second order is also considered. The
general solution for a particular form of intertwining operator is found, its
properties - symmetry, irreducibility, separation of variables - are
investigated.Comment: 16 page
Multifactorial audit of invasive cervical cancer: key lessons for the National Screening Programme.
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