Jacques Friedel

Jacques Friedel was a French physicist and materials scientist noted for foundational contributions to the theory of defects in solids, the electronic structure of alloys, and surface phenomena. Over a career spanning institutions including École Polytechnique, CNRS, and Collège de France, he influenced generations of researchers in solid-state physics, materials science, and metallurgy. His work intersected with major figures and movements in 20th-century physics such as Nevill Mott, John Bardeen, Lev Landau, and institutions like CERN and École des Mines de Paris.

Early life and education

Born in Paris to a family engaged in scientific and cultural life, Friedel attended preparatory classes that led him to École Polytechnique, where he studied alongside contemporaries who later joined CNRS and CEA. He completed engineering studies at École des Mines de Paris and subsequently pursued doctoral work under Nevill F. Mott at University of Bristol, linking him to the British school of solid-state physics associated with scholars like Philip Anderson and Walter Kohn. His early formation connected French institutions such as Université Paris-Sud with Anglo‑American developments exemplified by Bell Labs and the Royal Society.

Academic and research career

Friedel held positions at École Polytechnique and within CNRS, later occupying a chair at Collège de France, where he taught alongside professors from École Normale Supérieure and visiting scholars from Princeton University and Harvard University. He supervised students who went on to roles at CEA, Max Planck Institute for Solid State Research, and industrial laboratories such as Rutherford Appleton Laboratory and IBM Research. His laboratory collaborations linked to projects at CERN on materials for accelerators, to metallurgy groups at ArcelorMittal and to surface‑science teams at UPMC. Friedel also served on committees of Académie des sciences and participated in multinational initiatives coordinated by OECD and European Research Council-related programs.

Scientific contributions and legacy

Friedel is best known for elucidating the electronic response of a metal to impurities, now commonly referred to in the literature as Friedel oscillations; this concept connected to prior and subsequent work by Rudolf Peierls, Lev Landau, and John Bardeen. He developed theoretical treatments of dislocations, vacancies, and interstitials that bridged ideas from metallurgy at École des Mines de Paris with formal techniques used by Nevill Mott and Felix Bloch. His analyses of the coherent potential approximation and phase shifts informed theories of random alloys advanced by Philip Anderson and P. W. Anderson, and influenced computational approaches later adopted at Argonne National Laboratory and Lawrence Berkeley National Laboratory. Friedel's investigations into surface states complemented experimental studies by groups at Argonne National Laboratory and SLAC, and anticipated developments in scanning probe microscopy pioneered at IBM Research and University of Basel.

He authored seminal reviews and books that became standard references in curricula at École Polytechnique and Université Paris-Sud, shaping courses in solid-state physics and materials science alongside textbooks by Charles Kittel and Nevill Mott. His conceptual frameworks remain central to modern treatments of electronic localization, impurity scattering, and the role of defects in superconductivity research at institutions such as MIT and University of Cambridge. Friedel’s legacy endures in research on nanostructures and two‑dimensional materials undertaken at ICFO and Max Planck Institute for Microstructure Physics.

Honors and awards

Friedel received major French and international honors including election to the Académie des sciences and awards from institutions like CNRS and École des Mines de Paris. He was decorated with national distinctions such as the Légion d'honneur and recognized by foreign academies including Royal Society fellowships and honors from the American Physical Society. Professional societies including European Physical Society and the Institute of Physics have cited his contributions in lectureships and commemorative symposia; universities such as Université Paris-Sud and École Polytechnique awarded him honorary degrees and chairs named in his honor have been discussed at meetings of the International Union of Crystallography.

Personal life and family

Friedel was part of a family with scientific and academic connections, maintaining ties to cultural institutions in Paris and to academic networks spanning France, United Kingdom, and the United States. He engaged with scientific societies including Société Française de Physique and contributed to outreach with museums such as the Musée des Arts et Métiers. Colleagues recall his mentorship of researchers who later joined CNRS and international laboratories; descendants and relatives continued involvement in academia and professional organizations such as Institut Pasteur and Collège de France.

Category:French physicists Category:1921 births Category:2014 deaths