66 citations · 178 across the 7 of their papers we have counts for
7 papers
Identification of a possible superconducting transition above room temperature in natural graphite crystals
Christian E. Precker, Pablo D. Esquinazi, Ana Champi +11
Measuring with high precision the electrical resistance of highly ordered natural graphite samples from a Brazil mine, we have identified a transition at 350~K with 40~…
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…
Trace element content and magnetic properties of commercial HOPG samples studied by ion beam microscopy and SQUID magnetometry
D. Spemann, P. Esquinazi, A. Setzer +1
In this study, the impurity concentration and magnetic response of nine highly oriented pyrolytic graphite (HOPG) samples with different grades and from different providers were de…
Granular superconductivity at room temperature in bulk highly oriented pyrolytic graphite samples
T. Scheike, P. Esquinazi, A. Setzer +1
We have studied the magnetic response of two bulk highly oriented pyrolytic graphite (HOPG) samples with different internal microstructure. For the sample with well defined interfa…
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…
Large local Hall effect in pin-hole dominated multigraphene spin-valves
P. K. Muduli, J. Barzola-Quiquia, S. Dusari +4
We report local and non-local measurements in pin-hole dominated mesoscopic multigraphene spin-valves. Local spin-valve measurements show spurious switching behavior in resistance…
Enhancement of the ferromagnetic order of graphite after sulphuric acid treatment
J. Barzola-Quiquia, W. Böhlmann, P. Esquinazi +5
We have studied the changes in the ferromagnetic behavior of graphite powder and graphite flakes after treatment with diluted sulphuric acid. We show that this kind of acid treatme…