Johannes Georg Bednorz

Prof. Dr. Johannes Georg Bednorz

Nationality
Germany 
Institution
IBM Zurich Research Laboratory 
Award
1987 
Discipline
Physics 
Co-recipients
Prof. Dr. Karl A. Müller 

Biography on the Official Web Site of the Nobel Prize

CURRICULUM VITAE

Johannes Georg Bednorz received his master's degree from the University of Münster in 1976 and his PhD from the Swiss Federal Institute of Technology, ETH Zurich, in 1982. In January 1982 he joined the IBM Zurich Research Laboratory in Rüschlikon, Switzerland, as a Research Staff Member.

His research in the area of solid state physics was focused on the investigation of structural phase transitions and ferroelectric properties of perovskite-type oxides. From 1983 on, he concentrated on the investigation of metallic oxides with the goal to develop superconductors with high transition temperatures. In 1987, he and K. Alex Müller were awarded the Nobel Prize in Physics for the discovery of high-Tc superconductivity in a new class of compounds.

Since then, his research activities as an IBM Fellow concentrate on the development of new complex oxide compounds and their specific modification for possible implementation in microelectronics. In this connection, his interest is focused on the behavior of thin epitaxial layers, in particular metal-insulator-metal heterostructures, in strong electric fields. This work led to the discovery of a charge driven insulator metal transition and resistive switching effects in perovskite oxides, which therefore can be added to the list of materials for possible
memory applications.

In connection with the work which led to the Nobel Prize he received, together with
K. A. Müller, the Thirteenth Fritz London Memorial Award 1987 (University of California), the Marcel-Benoist Prize 1986 (Marcel-Benoist Foundation, Switzerland), the Dannie Heineman Prize 1987 (Academy of Sciences Göttingen) the Robert Wichard Pohl Prize 1987 (German Physical Society), the Hewlett-Packard Europhysics Prize 1988 (European Physical Society). In March 1988 he was awarded, together with Müller, the International Prize for New Materials Research of the American Physical Society. He is also recipient of the Viktor Moritz Goldschmidt Prize 1987 (German Mineralogical Society), the Otto-Klung Prize 1987 (Free University of Berlin) and together with Müller of the Aldo-Villa Prize 1991 (Italian Ceramic Society).

He received the honorary degree of doctor of natural sciences from the University of Salzburg and that of the University of Regensburg. He is a Distinguished Member of the Academy of Ceramics, a Honorary Member of the American Ceramic Society and Fellow of the American Physical Society. From the German Federal Republic he received in 1988 "Das Grosse Bundesverdienstkreuz mit Stern und Schulterband".

 

Johannes Bednorz is part of the exhibition project "Sketches of Science" by Volker Steger

Exhibition "Sketches of Science" by Volker Steger - Locations & Dates

J. Georg Bednorz' Sketch of Science
J. Georg Bednorz' Sketch of Science


By Volker Steger

Johannes Georg Bednorz is not only a physicist, but he also takes a great
personal interest in art. His specialty is bronze sculpture, which he does in his
scarce free time. When I give him the paper and ask for the drawing, he takes
quite a bit of time, executing a precise sketch of the rhombic structures of
the superconducting materials he works with. I suggest that he
should combine science and art by making bronze sculptures in
the shape of superconducting crystal structures.
That would fi nally be meaningful art!

Johannes Georg Bednorz ist nicht nur Physiker, sondern pfl egt
auch ein ausgeprägtes Interesse an der Kunst. Seine Spezialität
sind Bronzeskulpturen, die er in seiner knappen Freizeit anfertigt. Als ich ihm den
Bogen Papier überreiche und um die Zeichnung bitte, nimmt er sich Zeit. Dann zeichnet er
mit großer Präzision die rhombischen Strukturen der supraleitenden Materialien, mit denen
er arbeitet. Ich schlage ihm vor, dass er doch Wissenschaft und Kunst durch Anfertigung von
Bronzeskulpturen in der Form von supraleitenden Kristallstrukturen kombinieren könnte.
Das wäre doch endlich mal aussagekräftige Kunst!

Restructuring Superconductivity
by Adam Smith


Nobel Prizes tend to be awarded quite a few years, and occasionally quite a few decades, after the discoveries which they celebrate. Alfred Nobel’s will stipulates that the Prizes should reward people who “during the preceding year, shall have conferred the greatest benefit to mankind,” and normally the benefit of discoveries takes a little time to be recognized. But just occasionally a fundamental discovery leads to immediate recognition. J. Georg Bednorz’s Nobel Prize in Physics, which he received, together with his senior partner Alex Müller, in 1987, was one such case. Their discovery of an entirely new form of ‘high temperature’ superconducting material had taken place just the year beforehand, in 1986.


Superconductivity occurs when electric current flows through a material with absolutely no resistance. It was first encountered in 1911 in liquid helium, at a temperature very close to absolute zero. Superconductivity is a property which kicks-in at low temperatures, and ever since 1911 the search was on for materials that would become superconductive at higher, more generally useful, temperatures. The temperature below which a substance switches to being superconductive is known as ‘Tc’, and, as Bednorz has indicated at the bottom of his sketch, the Tc for his new material was 35 Kelvin, 35 degrees above absolute zero. That is still only -238oC, and at first sight it might seem odd to describe this as being “High”. But that finding represented a sudden and significant step-up from the previous best of -250oC, leading rapidly to a host of still better Tcs.


Bednorz and Müller had achieved their breakthrough by manipulating the structure of an unlikely material; a type of ceramic insulator called perovskite, shown on the right of the drawing, together with its general structural formula (ABO3). As depicted, perovskite crystals consist of metal atoms incorporated within a three-dimensional network of octahedra formed from oxygen atoms. The large arrow to the left indicates Bednorz and Müller’s experimental transformation of this material from a 3-D network into a series of disconnected layers of octahedra, depicted running horizontally across the page. In parallel they changed the metal composition, adding barium to the mix of lanthanum and copper, which changed the charge state of some of the copper atoms present, from +2 to +3, as seen in the sketch. These changes made the materials superconducting, although the mechanism for that superconductivity remains uncertain to this day.


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