Special Issue "From Quantum Paraelectric/Ferroelectric Perovskite Oxides to High Temperature Superconducting Copper Oxides -- In Honor of Professor K.A. Müller for His Lifework"

A special issue of Condensed Matter (ISSN 2410-3896).

Deadline for manuscript submissions: 15 September 2020.

Special Issue Editors

Prof. Annette Bussmann-Holder
Website
Guest Editor
Max-Planck-Institut für Festkörperforschung, Heisenbergstr.1, D-70569 Stuttgart, Germany
Interests: ferroelectrics; antiferroelectricss; multiferroics; magnetism; phase transitions; superconductivity; nonlinear interactions
Prof. em. Dr. Hugo Keller
Website
Guest Editor
Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
Interests: magnetism; superconductivity; critical phenomena and phase transitions in low-dimensional magnetic systems; biomolecular physics; muon and muonium physics in condensed matter; microscopic and macroscopic properties of novel superconductors (cuprates, magnesium diboride, iron-based superconductors) and related magnetic systems; vortex matter in cuprate and other novel superconductors; colossal magnetic resistance (CMR) in manganites; isotope and polaronic effects in novel superconductors and manganites; pressure effects in novel superconductors; microscopic magnetic properties of magnetic and superconducting multilayer structures; electronic; magnetic and structural properties of multiferroic systems; Experimental methods: Mössbauer effect, bulk and low-energy muon-spin rotation (muSR), electron paramagnetic resonance (EPR), nuclear magnetic resonance (NMR), nuclear quadrupole resonance (NQR), neutron scattering, SQUID and torque magnetometry, transport experiments
Prof. Antonio Bianconi
Website
Guest Editor
Rome International Center for Materials Science Superstripes (RICMASS), Via dei Sabelli 119A, 00185 Roma, Italy
Interests: experimental methods: synchrotron radiation research; XANES spectroscopy; many body effects in XANES; scanning micro X-ray diffraction; materials: transition metal oxides; high Tc superconductors; metallo-proteins; biological systems; quantum phenomena in complex matter: lattice and electronic complexity; polymorphism; valence fluctuation; multi-band Hubbard models; superstripes; nanoscale electronic phase separation; protein fluctuations; effective charge and coordination in active sites of metalloproteins; origin of life
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Special Issue Information

Dear Colleagues,

This special issue of the journal is dedicated to the lifework of Professor Dr. Dr. h.c. multi. K. Alex Müller. This comprises multiple contributions to solid state physics starting early on in the field of structural phase transitions in perovskite oxides with emphasis on electron-paramagnetic resonance (EPR) investigations of those compounds. From those essential knowledge was gained on the order parameter of the phase transition and the driving mechanism. The suppression of the expected transition to the polar state in SrTiO3 was coined quantum paraelectric by him and has raised enormous interest in the community. Further EPR studies by him are related to resonances of impurity ions in diverse perovskites and related crystals, thereby discovering experimentally negative U-centers later on established theoretically. The Jahn-Teller effect attracted his attention early on and played a key role in the discovery of superconductivity where especially the Jahn-Teller polaron was at the heart of it. The polaron has been shown to be vital also in Fermi glasses, LaBaNiO4 and doped polythiophene. The concept of the Jahn-Teller polaron in connection with perovskite oxides inspired him to search for superconductivity in these compounds which – as everybody knows – was successful. Together with Georg Bednorz he discovered high temperature superconductivity in LaBaCuO with the highest transition temperatures at ambient pressure ever observed which was awarded with the Nobel prize only one year later. This discovery caused an enormous world-wide breakthrough in basic research as well as in possible applications. In order to explain these findings, the polaron concept and the bipolaron condensation were suggested by him. In order to verify this concept he proposed to search for unconventional isotope effects which have indeed been observed in cuprates.

Contributions to all fields mentioned above and related topics are welcome.

Please kindly noted that the fees for all submissions to our Special Issue will be wavied.

Prof. Dr. Annette Bussmann-Holder
Prof. Dr. Hugo Keller
Prof. Antonio Bianconi
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Condensed Matter is an international peer-reviewed open access quarterly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (1 paper)

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Research

Open AccessFeature PaperCommunication
Polaronic States and Superconductivity in WO3-x
Condens. Matter 2020, 5(2), 32; https://doi.org/10.3390/condmat5020032 - 01 May 2020
Abstract
Superconducting domain boundaries were found in WO3-x and doped WO3. The charge carriers in WO3-type materials were identified by Schirmer and Salje as bipolarons. Several previous attempts to determine the electronic properties of polarons in WO3 failed [...] Read more.
Superconducting domain boundaries were found in WO3-x and doped WO3. The charge carriers in WO3-type materials were identified by Schirmer and Salje as bipolarons. Several previous attempts to determine the electronic properties of polarons in WO3 failed until Bousque et al. (2020) reported a full first principle calculation of free polarons in WO3. They confirmed the model of Schirmer and Salje that each single polaron is centred around one tungsten position with surplus charges smeared over the adjacent eight tungsten positions. Small additional charges are distributed further apart. Further calculations to clarify the coupling mechanism between polaron to form bipolarons are not yet available. These calculations would help to identify the carrier distribution in Magneli clusters, which were shown recently to contain high carrier concentrations and may indicate totally localized superconductivity in non-percolating clusters. Full article
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