1,722,263 research outputs found
My friend Alex M\"uller
Get PDFAlex, the main discoverer of high Tc superconductivity, was also a dear
friend. Here I offer a few frank anecdotes, possibly inaccurate in some details
but heartfelt and accurate in the substance, as a personal tribute to our
friendship.Comment: To appear on Physica C Superconductivity -- K. Alex M\"uller memorial
issu
Masanes-Galley-M\"uller and the State-Update Postulate
Get PDFMasanes, Galley and M\"uller claim to have derived a unique rule for quantum
state update consequent upon a measurement outcome. Upon closer examination,
their proof implicitly assumes its first step, namely that the state-update
rule is linear.Comment: 6 pages; v2: added reply to their reply to my comment, trying to
avoid talking past one anothe
Alex M\"uller, the High-Tc Field-Effect Transistor and Electric-Field Gated Quantum Materials
Get PDFAlex M\"uller and Georg Bednorz are widely recognized for their trailblazing
discovery of high-temperature superconductivity and their groundbreaking
research on SrTiO3. In comparison, their substantial contributions to inventing
the high-Tc superconducting field-effect transistor remain relatively unknown.
Nevertheless, their efforts were crucial in developing the electric field
effect into a valuable tool for studying a broad spectrum of complex materials.
This article provides a brief overview of these developments and of the current
status in this field, with a particular focus on Alex M\"uller's visionary role
in advancing the field following the discovery of high-temperature
superconductivity.Comment: Contribution to a planned memorial issue for K.A. M\"uller by Physica
K. Alex M\"uller and his important role in ferroelectricity
Get PDFIn this review we concentrate on the work of K. Alex M\"uller in connection
with his activities on oxide perovskites and ferroelectrics which were central
to his research career long before he successfully discovered the first high
temperature superconductor (HTSC) together with J. G. Bednorz in 1986. Not
accidentally, but taking his long experience in perovskite ferroelectrics into
account, the first HTSC was an oxide perovskite which had never been considered
before to be superconducting.Comment: 8 pages, 4 figure
K. Alex M\"uller: Science between ferroelectricity and superconductivity
Get PDFK. Alex M\"uller started his scientific career in 1958 when he was about
thirty-one years old. After his wife passed away and being in his nineties, his
interest in physics gradually faded. In those years shortly before he passed
away, on January 9, 2023, he was no longer interested in superconductivity or
ferroelectricity, he had become essentially devoted to philosophy and
psychology. It is of note that altogether his research in physics comprised
sixty years of activity. Almost in the middle of this period, he was awarded
the Nobel Prize in Physics for the discovery of high-temperature
superconductivity in ceramic copper oxides in 1987. This discovery made him
truly famous. While most researchers are familiar with his Nobel Prize work,
many are not aware of the fact that K. Alex M\"uller was already an acclaimed
scientist before that and highly respected in the field of perovskite oxides,
ferroelectricity, structural phase transitions, Jahn-Teller physics, electron
paramagnetic resonance (EPR) and, especially so in the properties of SrTiO3.Comment: 13 pages, 7 figures, 1 tabl
A Cheeger-M\"uller theorem for manifolds with wedge singularities
Get PDFWe study the spectrum and heat kernel of the Hodge Laplacian with
coefficients in a flat bundle on a closed manifold degenerating to a manifold
with wedge singularities. Provided the Hodge Laplacians in the fibers of the
wedge have an appropriate spectral gap, we give uniform constructions of the
resolvent and heat kernel on suitable manifolds with corners. When the wedge
manifold and the base of the wedge are odd dimensional, this is used to obtain
a Cheeger-M\"uller theorem relating analytic torsion with the Reidemeister
torsion of the natural compactification by a manifold with boundary.Comment: 74 pages, 7 figures, small modification
How to Swoop and Grasp like a Bird with a Passive Claw for High-Speed Grasping
No full textThis dataset corresponds to the publication:
"How to Swoop and Grasp like a Bird with a Passive Claw for High-Speed Grasping" W. Stewart, E. Ajanic, M. M¨uller, and D. Floreano. Transactions on Mechatronics
M\"uller-Zhang truncation for general linear constraints with first or second order potential
Get PDFLet be a homogeneous differential operator of order or
. We show that a sequence of functions of the form
converging in the -sense to a compact, convex set can be modified into
a sequence converging uniformly to this set provided that the derivatives of
order are uniformly bounded. We prove versions of our result on the whole
space, an open domain, and for varying uniformly continuously on an open,
bounded domain. This is a conditional generalization of a theorem proved by S.
M\"uller for sequences of gradients, cf. [6]. Moreover, a potential of order
two for the linearized isentropic Euler system is constructed.Comment: 26 page
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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