K
K. A. Müller
Researcher at IBM
Publications - 17
Citations - 2197
K. A. Müller is an academic researcher from IBM. The author has contributed to research in topics: Type (model theory) & Order (ring theory). The author has an hindex of 13, co-authored 17 publications receiving 2098 citations. Previous affiliations of K. A. Müller include Sapienza University of Rome.
Papers
More filters
Journal ArticleDOI
Sr 1 − x Ca x Ti O 3 : An XY Quantum Ferroelectric with Transition to Randomness
TL;DR: A series of twenty homogeneous mixed crystals has been measured dielectrically between 4.2 and 300 K in the tetragonal phase, and the dielectric constant perpendicular to the $c$ axis becomes peaked above ${x}_{c} = 0.0018, the quantum mechanical onset for displacive ferroelectricity as mentioned in this paper.
Journal ArticleDOI
Origin of superconductive glassy state and extrinsic critical currents in high-Tc oxides.
Guy Deutscher,K. A. Müller +1 more
TL;DR: The short coherence length of high-${\mathrm{T}$ oxides is shown to induce considerable weakening of the pair potential at surfaces and interfaces, and it is argued that this effect is responsible for the existence of internal Josephson junctions at twin boundaries.
Journal ArticleDOI
Characteristic Structural Phase Transition in Perovskite-Type Compounds
TL;DR: In this paper, the tetragonal and trigonal rotation angles of perovskite compounds were measured by paramagnetic resonance below their respective phase transitions, where the normalized rotation angles vary quantitatively in the same way as a function of reduced temperature.
Journal ArticleDOI
Static Critical Exponents at Structural Phase Transitions
K. A. Müller,W. Berlinger +1 more
TL;DR: In this article, the rotational displacement parameters below the second-order phase transitions in SrTi${\mathrm{O}}_{3}$ and LaAl${O}$ at T{T}_{a}=105.5
Journal ArticleDOI
Structural Phase Transitions in Perovskite-Type Crystals
H. Thomas,K. A. Müller +1 more
TL;DR: In this paper, a simple model Hamiltonian for phase transitions in perovskite compounds was introduced for the study of phase transitions involving rotations of $B{\mathrm{O}}_{6}$ octahedra.