Nonresonant direct absorption of unmodulated microwaves by both the thallium and yttrium copper oxide superconductors exhibits pronounced temperature-and/or field-history dependence. Zero-fieldcooled samples exhibited an absorption minimum at zero field, and this rninimurn was displaced from zero for field-cooled samples. Rotating the samples relative to the field direction caused the minimum to shift in an approximately cosinusoidal manner.
EPR studies of As-doped KDP show the presence of quasi-static ferroelectric domains at temperatures well above the ferroelectric transition temperature. The temperature dependence of the separation between the spectral lines from each domain was determined from 10 to 300 K. Comparison were made with mean field theory, and the Anderson exchange model.
In this work, we discuss the growth of dilute InAsBi nanostructures grown by metalorganic vapor phase epitaxy on GaAs substrates. The surface morphology of InAsBi nanostructures is carefully investigated, as a function of the growth temperature, by scanning electronic microscopy and atomic force microscopy. (004) High-resolution X-ray diffraction configuration has been used to characterize the crystalline quality and Bi incorporation in the InAsBi films. Low temperature and low Bi flow favor the formation of elongated nanostructures during growth. We give a quantitative description of the elemental processes for the formation of these nanostructures. Our description is based on the Tersoff and Tromp theoretical model.
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