Publications by Davor Pavuna | EPFL Graph Search

Alex's Vision in Functional Quantum Matter

MDPI2024

Unexpected effects of thickness and strain on superconductivity and magnetism in optimally doped La1.84Sr0.16CuO4 thin films

2018

On Local Pairs vs. BCS: Quo Vadis High- T-c Superconductivity

Davor Pavuna, Guy Joseph Günter Dubuis, Ivan Bozovic, Xi He

Since the discovery of high-temperature superconductivity in cuprates, proposals have been made that pairing may be local, in particular in underdoped samples. Here, we briefly review evidence for local pairs from our experiments on thin films of La (2-x) ...

Springer2017

Oxygen Displacement in Cuprates under Ionic Liquid Field-Effect Gating

Davor Pavuna, Guy Joseph Günter Dubuis, Ivan Bozovic, Xi He

We studied structural changes in a 5 unit cell thick La1.96Sr0.04CuO4 film, epitaxially grown on a LaSrAlO4 substrate with a single unit cell buffer layer, when ultra-high electric fields were induced in the film by applying a gate voltage between the film ...

Nature Research2016

Tuning of the Thermoelectric Figure of Merit of CH3NH3MI3 (M=Pb,Sn) Photovoltaic Perovskites

László Forró, Davor Pavuna, Bálint Náfrádi, Massimo Spina, Endre Horvath, Xavier François Mettan, Andrea Pisoni, Péter Krisztián Matus, Riccardo Pisoni

The hybrid halide perovskites, the very performant compounds in photovoltaic applications, possess large Seebeck coefficient and low thermal conductivity, making them potentially interesting high figure of merit (ZT) materials. For this purpose, one needs ...

American Chemical Society2015

Magnetic field, frequency and temperature dependence of complex conductance of ultrathin La1.65Sr0.45CuO4/La2CuO4 films and the organic superconductors kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Br

Davor Pavuna, Guy Joseph Günter Dubuis, Ivan Bozovic, Xi He

We used atomic-layer molecular beam epitaxy (ALL-MBE) to synthesize bilayer films of a cuprate metal (La1.65Sr0.45CuO4, LSCO) and a cuprate insulator (La2CuO4, LCO), in which interface superconductivity occurs in a layer that is just one-half unit cell thi ...

World Scientific Publ Co Pte Ltd2015

On field effect studies and superconductor-insulator transition in high-Tc cuprates

Davor Pavuna, Guy Joseph Günter Dubuis, Ivan Bozovic

We summarize previous field effect studies in high-T (c) cuprates and then discuss our method to smoothly tune the carrier concentration of a cuprate film over a wide range using an applied electric field. We synthesized epitaxial one-unit-cell thick films ...

Springer Berlin Heidelberg2013

Critical Resistance at the Superconductor-Insulator Transition in Hole-Doped Cuprates

Davor Pavuna, Guy Joseph Günter Dubuis, Ivan Bozovic

Here, we show that in several p-type cuprates, the superconductor-to-insulator transition (SIT) occurs at the critical sheet resistance approximately equal to the quantum resistance of pairs, RQ=h/4

e^{2}

=6.5 kΩ. In a relatively broad range of temperature ...

Springer Verlag2013

Atomic-Layer Engineering of Oxide Superconductors

Davor Pavuna, Guy Joseph Günter Dubuis, Ivan Bozovic

Molecular beam epitaxy technique has enabled synthesis of atomically smooth thin films, multilayers, and superlattices of cuprates and other complex oxides. Such heterostructures show high temperature superconductivity and enable novel experiments that pro ...

2012

Electric field effect on superconductivity in $La_{2-x}$$Sr_{x}$$CuO_{4}$

Davor Pavuna, Guy Joseph Günter Dubuis, Ivan Bozovic

We demonstrate a method to tune the carrier concentration of a high temperature superconductor over a wide range, using an applied electric field. Thin film devices were made in an electrical double layer transistor configuration utilizing an ionic liquid. ...

American Institute of Physics2012

Superconductor–insulator transition in La2 − xSrxCuO4 at the pair quantum resistance

Davor Pavuna, Guy Joseph Günter Dubuis, Ivan Bozovic

High-temperature superconductivity in copper oxides arises when a parent insulator compound is doped beyond some critical concentration; what exactly happens at this superconductor–insulator transition is a key open question1. The cleanest approach is to t ...

2011

Direct angle resolved photoemission spectroscopy and superconductivity of strained high- T c films

Mike Abrecht, Dominique Cloëtta, Davor Pavuna, Claudia Cancellieri

Since 1997 we systematically perform direct angle resolved photoemission spectroscopy (ARPES) on in-situ grown thin (

Springer2008

Fermi surface determination from wavevector quantization in LaSrCuO films

Davor Pavuna, Claudia Cancellieri, Ping-Hui Lin

We have observed the wavevector quantization in LaSrCuO films thinner than 12 unit cells grown on SrTiO3 substrates. Low energy dispersions were determined in situ for different photon energies by angle resolved photoemission spectroscopy. From the wavevec ...

AIP American Institute of Physics2008

Direct angle resolved photoelectron spectroscopy (DARPES) on high-Tc films: doping, strains, Fermi surface topology and superconductivity

Mike Abrecht, Dominique Cloëtta, Davor Pavuna, Claudia Cancellieri

Since 1997 we systematically perform Direct ARPES (=DARPES) on in-situ grown, non-cleaved, ultra-thin (

Iop Publishing Ltd, Dirac House, Temple Back, Bristol Bs1 6Be, England2008

Embedded polytypes in Bi2Sr2-xLaxCuO6 thin films grown by laser ablation

Davor Pavuna, Claudia Cancellieri, Ping-Hui Lin

We investigate the presence of secondary phases in La-doped Bi-2201 thin films grown by laser ablation. The cation ratios in the target material, the oxygen pressure, and the substrate temperature during the deposition are the main parameters determining t ...

2007

Dopant rearrangement and superconductivity in Bi_2Sr_(2-x)La_xCuO_6 thin films under annealing

Davor Pavuna, Claudia Cancellieri, Ping-Hui Lin

2007

Self ordering of random intercalates in thin films of cprates superconductors: Growth model and x-ray diffraction diagnosis

Davor Pavuna, Claudia Cancellieri, Ping-Hui Lin

2007

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

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

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