Learn More
Sugars play an important role in grapevine flowering. This complex process from inflorescence initiation to fruit maturity takes two growing seasons. Currently, most of the available data concern the involvement of sugars as energy sources during the formation of reproductive structures from initiation of inflorescences during the summer of the first year,(More)
The recently discovered oxypnictide superconductor SmFeAs(O,F) is the most attractive material among the Fe-based superconductors due to its highest transition temperature of 56 K and potential for high-field performance. In order to exploit this new material for superconducting applications, the knowledge and understanding of its electro-magnetic(More)
Strong pinning of superconducting flux quanta by a square array of 1-␮m-sized ferromagnetic dots in a magnetic-vortex state was visualized by low-temperature magnetic force microscopy. A direct correlation of the superconducting flux lines with the position of the dots was derived. It was found, that the superconducting vortices which are preferably located(More)
Superconducting and epitaxially grown LaFeAsO 1−x F x thin films were successfully prepared on (001)–oriented LaAlO 3 substrates using pulsed laser deposition. The prepared thin films show exclusively a single in–plane orientation with epitaxial relation (001)[100](001)[100] and a FWHM value of 1 •. Furthermore, resistive measurement of the superconducting(More)
High temperature (high-Tc) superconductors like cuprates have superior critical current properties in magnetic fields over other superconductors. However, superconducting wires for high-field-magnet applications are still dominated by low-Tc Nb3Sn due probably to cost and processing issues. The recent discovery of a second class of high-Tc materials,(More)
The Hall effect is a powerful tool for investigating carrier type and density. For single-band materials, the Hall coefficient is traditionally expressed simply by , where e is the charge of the carrier, and n is the concentration. However, it is well known that in the critical region near a quantum phase transition, as it was demonstrated for cuprates and(More)
Fe-based superconductors (FBS) present a large variety of compounds whose properties are affected to different extents by their crystal structures. Amongst them, the REFeAs(O,F) (RE1111, RE being a rare-earth element) is the family with the highest critical temperature Tc but also with a large anisotropy and Josephson vortices as demonstrated in the(More)
  • 1