J. Georg Bednorz

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High-temperature superconductors (abbreviated high-T c or HTS) are materials that have a superconducting transition temperature (Tc) above 30 K (Ä243.2ÄÅC). From 1960 to 1980, 30ÄK was thought to be the highest theoretically possible Tc. The first high-Tc superconductor [1] was discovered in 1986 by IBM researchers Karl MÇller and Johannes Bednorz, for(More)
The first direct observation of charge order of Ni(3+delta(')) and Ni(3-delta) by resonant x-ray scattering experiments in an epitaxial film of NdNiO3 is reported. A quantitative value of delta+delta(') = (0.45 +/- 0.04)e was obtained. The temperature dependence of the charge order deviates significantly from those of the magnetic moment and(More)
oxide-based resistancechange memories S. F. Karg G. I. Meijer J. G. Bednorz C. T. Rettner A. G. Schrott E. A. Joseph C. H. Lam M. Janousch U. Staub F. La Mattina S. F. Alvarado D. Widmer R. Stutz U. Drechsler D. Caimi We provide a status report on the development of perovskite-based transition-metal-oxide resistance-change memories. We focus on bipolar(More)
Phase transformations in crystalline materials are common in nature and often modify dramatically properties of materials. The ability to precisely control them with a high spatial precision represents a significant step forward in realizing new functionalities in confined dimensions. However, such control is extremely challenging particularly at the atomic(More)
The exceptional interest in the new class of oxide superconductors and the importance of these materials are discussed together with the concepts that led to their discovery. The discovery itself and its early confirmation are summarized, including the work until the beginning of 1987. The observation of a superconductive glass state in percolative samples(More)
La(2)CuO4-y ceramics containing a few percent of Ca(2+), Sr(2+), and Ba(2+) ions have been prepared. Resistivity and susceptibility measurements exhibit superconductive onsets (as in earlier Ba(2+)-containing samples). The onset temperature La(2)CuO4-y with Sr(2+) is higher and its superconductivity-induced diamagnetism larger than that found with Ba(2+)(More)
Oxide heterointerfaces often trigger unusual electronic properties that are absent in respective bulks. Here, direct evidence is offered for spontaneously assembled local structural distortions in a single-phase bulk, which confine electrons to within an atomic layer with notable orbital reconstruction and coupling, close the forbidden band, induce a(More)
A one-parameter scaling of the magnetization curves of the high-temperature superconductor Tl-Ba-Ca-Cu-0 causes all data points in the irreversible regime to collapse into a single curve M H f~ (H/H*). The scaling field H* is inversely proportional to temperature and f+ and f are th—e scaling functions for fields H above and below H*, respectively. The(More)
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