Publication

Van Hove singularity as a possible origin of the bandwidth renormalization in layered superconductors

Publications associées (40)

Three-dimensional dispersion induced by extreme tensile strain in La_(2−x)Sr_xCuO_4 films

Davor Pavuna, Slobodan Mitrovic, Dominique Cloëtta, Claudia Cancellieri, Mike Abrecht

The electronic band structure probed by angle-resolved photoemission spectroscopy on thin epitaxial La_(2−x)Sr_(x)CuO_(4) films under extreme tensile strain shows anomalous features compatible with c-axis dispersion. This result is in striking contrast wit ...

2006

Properties of La2-xSrxCuO4 under epitaxial strain

Dominique Cloëtta

The subject of this thesis is the growth and analysis of high temperature superconductor (HTSC) films and the study of their electronic structure and properties. In particular, the effect of epitaxial strain is investigated, predominantly by means of in-si ...

EPFL2005

Photoemission studies of thin films grown by pulsed laser deposition

Mike Abrecht

In this thesis I report on the unique novel possibilities offered by combining pulsed laser deposition (PLD) film growth of high temperature superconductors with angle integrated and angle resolved photoemission spectroscopy (PES and ARPES). The originalit ...

EPFL2003

Strain and high temperature superconductivity: Unexpected results from direct electronic structure measurements in thin films

Giorgio Margaritondo, Davor Pavuna, Dominique Cloëtta, Mike Abrecht

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 Br ...

2003

The symmetry of the order parameter in highly overdoped Bi2Sr2CaCu2O8+x

Giorgio Margaritondo, Marco Grioni

We report results of an angle-resolved high-resolution photoemission study of strongly overdoped Bi2Sr2CaCu2O8+x single crystals with T-c similar to 60 K. We find a nonzero superconducting (SC) gap along all three high symmetry directions in the Brillouin ...

1999

Electronic properties of layered oxides: Pulsed laser deposition of YBCO films for in-situ studies by photoemission spectroscopy

Giorgio Margaritondo, Marco Grioni, Davor Pavuna, Helmuth Berger

Due to imperfect surfaces of most cuprate samples, almost all photoemission studies in the past decade were performed on Bi2Sr2CaCu2O8+x, even though a large fraction of other studies and electronic applications was reported for YBa2Cu3O7-delta (YBCO) fami ...

1998

Electronic structure of CuO2 planes: From insulator to superconductor

Giorgio Margaritondo, Marco Grioni, Helmuth Berger

Using angle-resolved photoemission and linearly polarized synchrotron radiation, we measured the electronic band structure of electronic states of CuO2 plane materials ranging from insulators (Sr2CuO2Cl2) to overdoped superconductors (Bi2Sr2CaCu2O8+x). We ...

1997

Localization effects in Co- and Ni-doped Bi2Sr2CaCu2O8+gamma

Giorgio Margaritondo, Helmuth Berger

We have studied the influence of Co and Ni doping on the electronic band structure and the transport properties of high-temperature superconductors. The doping has dramatic effects on both the normal and the superconducting state. Upon doping the residual ...

1996

Valence Electronic-Structure of Thallium-Compound High-Temperature Superconductors

Giorgio Margaritondo

We used photoemission spectroscopy with synchrotron radiation to investigate the electronic structure of eight different thallium cuprates: pure Tl2.2Ba2CuO(y), Ce-doped Tl2.2Ba(2-x)Ce(x)CuO(y) (x = 0.1, 0.15, 0.2) and Tl2Ba2CeCu3O(y), and Zr-doped Tl2Ba(2 ...

1990

Electronic band structure study of (1,2,3) high-temperature superconductors

Giorgio Margaritondo

A general discussion of the electronic band structure properties of YBa2Cu3O7-x and other (1,2,3) high-temperature superconductors is presented. Both the occupied and unoccupied density of states are discussed. The key expe ...

1988

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