Electric field gradients in MgB$_2$ synthesized at high pressure: $^111$Cd TDPAC study and ab initio calculation
Abstract
We report the high-pressure synthesis of novel superconductor MgB and some related compounds. The superconducting transition temperature of our samples of MgB is equal to 36.6 K. The MgB 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 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 B NMR spectra of MgB reported in the literature. It is also very close to EFG found in our Cd TDPAC measurements, which suggests that the Cd probe substitutes for boron in the MgB lattice.
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Cite
@article{arxiv.cond-mat/0104560,
title = {Electric field gradients in MgB$_2$ synthesized at high pressure: $^111$Cd TDPAC study and ab initio calculation},
author = {A. V. Tsvyashchenko and L. N. Fomicheva and M. V. Magnitskaya and E. N. Shirani and V. B. Brudanin and D. V. Filossofov and O. I. Kochetov and N. A. Lebedev and A. F. Novgorodov and A. V. Salamatin and N. A. Korolev and A. I. Velichkov and V. V. Timkin and A. P. Menushenkov and A. V. Kuznetsov and V. M. Shabanov and Z. Z. Akselrod},
journal= {arXiv preprint arXiv:cond-mat/0104560},
year = {2009}
}
Comments
10 pages, 3 figures