TY - JOUR
T1 - Synthesis of Superconducting Cobalt Trihydride
AU - Pena Alvarez, Miriam
AU - Li, Bin
AU - Kelsall, Liam
AU - Binns, Jack
AU - Dalladay-Simpson, Philip
AU - Hermann, Andreas
AU - Howie, Ross
AU - Gregoryanz, Eugene
PY - 2020/8/6
Y1 - 2020/8/6
N2 - The Co-H system has been investigated through high-pressure high-temperature x-ray diffraction experiments combined with first principles calculations. On compression of elemental cobalt in a hydrogen medium, we observe fcc cobalt hydride (CoH) and cobalt dihydride (CoH2) at 33 GPa. Laser heating CoH2 in a hydrogen matrix at 75 GPa to temperatures in excess of 800 K, produces cobalt trihydride (CoH3) which adopts a primitive structure. Density functional theory calculations support the stability of CoH3. This phase is predicted to be thermodynamically stable at pressures above 18 GPa and to be a superconductor below 23 K as critical temperature, Tc. Theory predicts that this phase remains dynamically stable upon decompression above 11 GPa where it has a maximum Tc of 30 K.
AB - The Co-H system has been investigated through high-pressure high-temperature x-ray diffraction experiments combined with first principles calculations. On compression of elemental cobalt in a hydrogen medium, we observe fcc cobalt hydride (CoH) and cobalt dihydride (CoH2) at 33 GPa. Laser heating CoH2 in a hydrogen matrix at 75 GPa to temperatures in excess of 800 K, produces cobalt trihydride (CoH3) which adopts a primitive structure. Density functional theory calculations support the stability of CoH3. This phase is predicted to be thermodynamically stable at pressures above 18 GPa and to be a superconductor below 23 K as critical temperature, Tc. Theory predicts that this phase remains dynamically stable upon decompression above 11 GPa where it has a maximum Tc of 30 K.
U2 - 10.1021/acs.jpclett.0c01807
DO - 10.1021/acs.jpclett.0c01807
M3 - Article
VL - 11
SP - 6420
EP - 6425
JO - The Journal of Physical Chemistry Letters
JF - The Journal of Physical Chemistry Letters
SN - 1948-7185
IS - 15
ER -