[Todos] Charla sobre posible superconductividad en grafito con Tc > 400 K

[Carlos Acha]

Hola,

les paso información de una charla que podría ser de interés.
Saludos,
Carlos



Date : Thursday 13 February 14h French time
Room:  Institut Néel, Building A 2nd floor
Zoom link :  
https://univ-grenoble-alpes-fr.zoom.us/j/99704311337?pwd=DifLYnRYXc4ML48joXWxo5Q3sGJjkP.1
Speaker : Manuel Núñez-Regueiro (Institut Néel)
Title : Magnetic field sorting of superconducting graphite particles  
with Tc > 400K

Abstract:

It has been claimed that graphite hosts superconductivity at room  
temperature, although all efforts to isolate it have been vain.  Here  
we report separation methods that use magnetic field gradients to sort  
the superconducting from  normal grains out of industrial graphite  
powders. We have obtained a concentrate of above room temperature  
superconducting particles. Electrical resistance measurements on  
agglomerates of sorted grains of synthetic, natural and  
spectroscopically pure graphite all show transition temperatures up to  
Tc^{onset}~700 K with  zero resistance up to ~500K. Magnetization  
measurements confirm these values through jumps  at Tc in the zero  
field cooled curves, and by the occurrence of diamagnetic hysteretic  
cycles  shrinking with temperature. Transmission electron microscope  
images yield a hint of the novel structure of these grains.