By A. S. Alexandrov (auth.), Annette Bussmann-Holder, Hugo Keller (eds.)
This booklet containing 30 articles written through hugely reputed specialists is devoted to okay. Alex Müller at the celebration of his eightieth birthday. The contributions replicate the key study parts of ok. Alex Müller which he activated in extreme temperature superconductivity and section transitions. they're theoretical in addition to experimental ones and concentration quite often on extreme temperature superconductivity. A smaller half bargains with ferroelectricity and their purposes. additionally during this box there have lately been significant holiday throughs experimentally in addition to theoretically with a view to be addressed by means of the invited authors.
During the clinical profession of okay. Alex Müller he made significant advances within the realizing of ferroelectricity, which was his significant examine box. the invention of superconductivity in cuprates for which he acquired including J. Georg Bednorz the Nobel Prize in 1987 has now not reduced his curiosity during this quarter, yet has enlarged his actions significantly.
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Extra info for High Tc superconductors and related transition metal oxides: special contributions in honor of K. Alex Muller on the occasion of his 80th birthday
Thus the mass of the Fröhlich bipolaron in the perovskite layer scales approximately as a cubic root of that of the Holstein bipolaron. 16Ep , NNN bipolarons become stable. More importantly, holes can now form 3- and 4-particle clusters. The dominance of the potential energy over kinetic in the transformed Hamiltonian enables us to readily investigate these many-polaron cases. 80Ep . 26Ep – 4t 2 + t 2 . It is essential that between the squares such triads could move only in higher orders of polaron hopping.
We show that EF – ES is critical for these properties, leading to Fermi liquid or marginal Fermi liquid behaviour . We compute the Hall coefﬁcient and its variation with doping and temperature . We show that the experimental results may be explained by the topology of the Fermi surface (FS) which goes from hole-like to electron-like as the hole doping is increased. When the temperature is increased, the electron-like orbits start being populated. They give a negative contribution to the Hall coefﬁcient which Fig.
1 I-V characteristic with the low- and high-resistance state Perovskites and Their New Role in Oxide Electronics 31 Fig. 2% Cr. G. Bednorz Fig. 3 Final period of a three-hour electrical stress procedure on a SrTiO3 : Cr crystal, reaching a current compliance set at 1 mA oxygen-vacancy concentration [9, 10] are considered to lead to a conducting state. On the other hand, modiﬁcations of the interface [11, 12], local inhomogeneities  or local reduction/oxidation processes  are being discussed as the origin of the bistable resistance state.