J
Johan Juul Chang
Researcher at University of Zurich
Publications - 67
Citations - 3634
Johan Juul Chang is an academic researcher from University of Zurich. The author has contributed to research in topics: Superconductivity & Fermi surface. The author has an hindex of 27, co-authored 64 publications receiving 3122 citations. Previous affiliations of Johan Juul Chang include Niels Bohr Institute & Université de Sherbrooke.
Papers
More filters
Journal ArticleDOI
Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3O6.67
Johan Juul Chang,Johan Juul Chang,Elizabeth Blackburn,Alexander T. Holmes,Niels Bech Christensen,Jacob Larsen,Jacob Larsen,Joël Mesot,Joël Mesot,Ruixing Liang,Ruixing Liang,D. A. Bonn,D. A. Bonn,Walter Hardy,Walter Hardy,A. Watenphul,Martin v. Zimmermann,E. M. Forgan,Stephen M Hayden +18 more
TL;DR: X-ray diffraction experiments reveal that spatial charge ordering occurs in the pseudogap state of YBa2Cu3O6.67 as discussed by the authors, which competes with high-temperature superconductivity, and their relative strengths can be tuned using a magnetic field.
Journal ArticleDOI
Broken rotational symmetry in the pseudogap phase of a high- T c superconductor
Ramzy Daou,Johan Juul Chang,David LeBoeuf,O. Cyr-Choinière,Francis Laliberte,Nicolas Doiron-Leyraud,Brad Ramshaw,Ruixing Liang,Ruixing Liang,D. A. Bonn,D. A. Bonn,Walter Hardy,Walter Hardy,Louis Taillefer,Louis Taillefer +14 more
TL;DR: In this paper, it was shown that the pseudogap phase is an electronic state that strongly breaks four-fold rotational symmetry in YBa(2)Cu(3)O(y) that sets in precisely at T* throughout the doping phase diagram.
Journal ArticleDOI
Emergent quantum confinement at topological insulator surfaces
Mohammad Saeed Bahramy,Phil D. C. King,A. de la Torre,Johan Juul Chang,Ming Shi,L. Patthey,Geetha Balakrishnan,Ph. Hofmann,Ryotaro Arita,Naoto Nagaosa,Felix Baumberger +10 more
TL;DR: In this article, a conceptually simple model, implementing a semiconductor-like band bending in a parameter-free tight-binding supercell calculation, can quantitatively explain the entire measured hierarchy of electronic states.
Journal ArticleDOI
Direct measurement of the upper critical field in cuprate superconductors
Gael Grissonnanche,O. Cyr-Choinière,Francis Laliberte,S. René de Cotret,A. Juneau-Fecteau,Sophie Dufour-Beauséjour,M.-È. Delage,David LeBoeuf,Johan Juul Chang,Johan Juul Chang,Brad Ramshaw,D. A. Bonn,D. A. Bonn,Walter Hardy,Walter Hardy,Ruixing Liang,Ruixing Liang,Seiji Adachi,Nigel E. Hussey,Nigel E. Hussey,B. Vignolle,Cyril Proust,Mike Sutherland,S. Krämer,J.-H.. Park,David Graf,Nicolas Doiron-Leyraud,Louis Taillefer,Louis Taillefer +28 more
TL;DR: The thermal conductivity can be used to directly detect Hc2 in the cuprates Y Ba2Cu3Oy, YBa2Cu4O8 and Tl2Ba2 CuO6+δ, allowing us to map out Hc1 across the doping phase diagram, revealing that phase competition is a key limiting factor in the superconductivity of cuprates.
Journal ArticleDOI
Fermi-surface reconstruction by stripe order in cuprate superconductors
Francis Laliberte,Johan Juul Chang,Nicolas Doiron-Leyraud,Elena Hassinger,Ramzy Daou,M. Rondeau,Brad Ramshaw,Ruixing Liang,Ruixing Liang,D. A. Bonn,D. A. Bonn,Walter Hardy,Walter Hardy,Sunseng Pyon,Tomomi Takayama,Hidenori Takagi,Ilya Sheikin,Liam Malone,Cyril Proust,Cyril Proust,Kamran Behnia,Louis Taillefer,Louis Taillefer +22 more
TL;DR: A comparative study of thermoelectric transport in the cuprates YBCO and La1.8−xEu0.2SrxCuO4 (Eu-LSCO) is used to show that the two materials exhibit the same process of Fermi-surface reconstruction as a function of temperature and doping.