Journal ArticleDOI
Strain and high temperature superconductivity: Unexpected results from direct electronic structure measurements in thin films
M. Abrecht,Daniel Ariosa,D. Cloetta,Slobodan Mitrovic,Marshall Onellion,Xiaoxing Xi,Giorgio Margaritondo,Davor Pavuna +7 more
TLDR
In this paper, angle-resolved photo-emission spectroscopy reveals very surprising strain-induced effects on the electronic band dispersion of epitaxial La2-xSrxCuO4-delta thin films.Abstract:
Angle-resolved photoemission spectroscopy reveals very surprising strain-induced effects on the electronic band dispersion of epitaxial La2-xSrxCuO4-delta thin films. In strained films we measure a band that crosses the Fermi level (E-F) well before the Brillouin zone boundary. This is in contrast to the flat band reported in unstrained single crystals and in our unstrained films, as well as in contrast to the band flattening predicted by band structure calculations for in-plane compressive strain. In spite of the density of states reduction near E-F, the critical temperature increases in strained films with respect to unstrained samples. These results require a radical departure from commonly accepted notions about strain effects on high temperature superconductors, with possible general repercussions on superconductivity theory.read more
Citations
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Pseudogaps, dopants, and strong disorder in cuprate high-temperature superconductors
TL;DR: In this paper, a review reassesses the significance of many other mean field experiments in the context of strong disorder, with emphasis on the effects of highmobility dopants and long-range strain fields.
Journal ArticleDOI
Polaron formation as origin of unconventional isotope effects in cuprate superconductors
TL;DR: In this paper, it was shown that the exponential squeezing of the second nearest neighbour hopping integral carries the correct isotope effect on the superconducting transition temperature Tc, as well as the one on the penetration depth.
Journal ArticleDOI
Latent instabilities in metallic LaNiO3 films by strain control of Fermi-surface topology.
Hyang Keun Yoo,Seung Hyun,Luca Moreschini,Hyeong-Do Kim,Young Jun Chang,Changhee Sohn,Da Woon Jeong,Soobin Sinn,Yong Su Kim,Aaron Bostwick,Eli Rotenberg,Ji Hoon Shim,Tae Won Noh +12 more
TL;DR: This work investigates the strain-induced changes of electronic structures in strongly correlated LaNiO3 (LNO) films, using angle-resolved photoemission spectroscopy and the dynamical mean-field theory to search for new emergent phenomena in transition-metal-oxide films.
Journal ArticleDOI
Strain-engineering Mott-insulating La2CuO4.
O. Ivashko,Masafumi Horio,W. Wan,Niels Bech Christensen,Daniel McNally,Eugenio Paris,Yi Tseng,N. E. Shaik,Henrik M. Rønnow,Haofei I. Wei,Carolina Adamo,Céline Lichtensteiger,Marta Gibert,M. R. Beasley,Kyle Shen,Jan M. Tomczak,Thorsten Schmitt,Johan Juul Chang +17 more
TL;DR: In this paper, the Coulomb and magnetic exchange interaction of La2CuO4 thin films can be enhanced by compressive strain, and the parent Mott state can be optimized for enhancing the superconducting transition temperature in cuprates.
Journal ArticleDOI
HTC oxides: a collusion of spin, charge and lattice
TL;DR: In this paper, the authors summarize a perspective on high-temperature oxide superconductors (HTC) as systems of intrinsic, functional, and connected spatial scales, with an associated set of temporal scales.
References
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Journal ArticleDOI
Advances in the physics of high-temperature superconductivity
TL;DR: A perspective on recent developments in high-temperature copper oxide superconductors and their implications for the understanding of interacting electrons in metals is provided.
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Doubling the critical temperature of La1.9Sr0.1CuO4 using epitaxial strain
Jean-Pierre Locquet,J. Perret,J. Perret,Jean Fompeyrine,Jean Fompeyrine,E Machler,Jin Won Seo,Jin Won Seo,G. Van Tendeloo +8 more
TL;DR: In this article, the uniaxial strain and pressure derivatives of T c were analyzed for thin films of copper oxide superconductors, and it was shown that compressive epitaxial strain could in principle generate much larger increases in the critical temperature than obtained by comparable hydrostatic pressures.
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Band-Structure Trend in Hole-Doped Cuprates and Correlation with T c max
TL;DR: By calculation and analysis of the bare conduction bands in a large number of hole-doped high-temperature superconductors, the range of the intralayer hopping is identified as the essential, material-dependent parameter.
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Superconductivity above 150 K in HgBa2Ca2Cu3O8+δ at high pressures
TL;DR: In this paper, the authors reported superconductivity at up to 153 K in Hg-1223 at 150 kbar, with a main transition at 147 K. This observation provides an indication that supercondivity at >150 K may be possible in this system at ambient pressure, if suitable forms of chemical substitution can be found.
Journal ArticleDOI
LDA energy bands, low-energy Hamiltonians, t', t'', t_{perp}(k), and J_{perp}
TL;DR: In this paper, the LDA bandstructure of YBa_2Cu_3O_7 in the 2 eV range from the Fermi energy using orbital projections is described.