Electric field gradients in MgB${}_2$ synthesized at high pressure: ${}^{1}11$Cd TDPAC study and ab initio calculation

Abstract

We report the high-pressure synthesis of novel superconductor MgB${}_2$ and some related compounds. The superconducting transition temperature of our samples of MgB${}_2$ is equal to 36.6 K. The MgB${}_2$ lattice parameters determined via X-ray diffraction are in excellent agreement with results of our ab initio calculations. The time-differential perturbed angular correlation (TDPAC) experiments demonstrate a small increase in quadrupole frequency of ${}^{1}11$Cd probe with decreasing temperature from 293 to 4.2 K. The electric field gradient (EFG) at the B site calculated from first principles is in fair agreement with EFG obtained from ${}^{1}1$B NMR spectra of MgB${}_2$ reported in the literature. It is also very close to EFG found in our ${}^{1}11$Cd TDPAC measurements, which suggests that the ${}^{1}11$Cd probe substitutes for boron in the MgB${}_2$ lattice.

10 pages, 3 figures

References in corpus (2)

• Boron Isotope Effect in Superconducting MgB${}_2$
• Calculated elastic and electronic properties of MgB${}_2$ at high pressures

Cited by in corpus (2)

• High-pressure synthesis of pure and doped superconducting MgB2 compounds
• ^25Mg NMR study of the MgB_2 superconductor