75 citations · 111 across the 3 of their papers we have counts for
10 papers
Granular superconductivity below 5~K in SPI-II pyrolytic graphite
Ana Ballestar, Pablo Esquinazi, Winfried Böhlmann
We have studied the transport properties of transmission electron microscope (TEM) lamellae obtained from a pyrolytic graphite sample of grade B (SPI-II) with electrical contacts a…
Interface size dependence of the Josephson critical behaviour in pyrolytic graphite
Ana Ballestar, Tero T Heikkilä, Pablo Esquinazi
We have studied the transport properties of TEM lamellae obtained from a pyrolytic graphite sample with electrical contacts at the edges of the embedded interfaces. The temperature…
Can doping graphite trigger room temperature superconductivity? Evidence for granular high-temperature superconductivity in water-treated graphite powder
T. Scheike, W. Böhlmann, P. Esquinazi +3
Trying to dope graphite flakes we found that the magnetization of pure, several tens of micrometers grain size graphite powder and after a simple treatment with pure water shows cl…
Revealing the origin of the vertical hysteresis loop shifts in an exchange biased Co/YMnO bilayer
J. Barzola-Quiquia, A. Lessig, A. Ballestar +4
We have investigated exchange bias effects in bilayers composed by the antiferromagnetic o-YMnO and ferromagnetic Co thin film by means of SQUID magnetometry, magnetoresistance…
Evidence of Josephson-coupled superconducting regions at the interfaces of Highly Oriented Pyrolytic Graphite
A. Ballestar, J. Barzola-Quiquia, P. Esquinazi
Transport properties of a few hundreds of nanometers thick (in the graphene plane direction) lamellae of highly oriented pyrolytic graphite (HOPG) have been investigated. Current-V…
Possible superconductivity in multi-layer-graphene by application of a gate voltage
A. Ballestar, P. Esquinazi, J. Barzola-Quiquia +4
The carrier density in tens of nanometers thick graphite samples (multi-layer-graphene, MLG) has been modified by applying a gate voltage () perpendicular to the graphene plan…