High-pressure behavior of superconducting boron-doped diamond
Mahmoud Abdel-Hafiez, Dinesh Kumar, R. Thiyagarajan, Q. Zhang, R. T. Howie, K. Sethupathi, O. Volkova, A. Vasiliev, W. Yang, H. K. Mao, M. S. Ramachandra Rao
DOI 10.1103/PhysRevB.95.174519 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
This work investigates the high-pressure structure of freestanding superconducting (Tc=4.3 K) boron-doped diamond (BDD) and how it affects the electronic and vibrational properties using Raman spectroscopy and x-ray diffraction in the 0–30 GPa range. High-pressure Raman scattering experiments revealed an abrupt change in the linear pressure coefficients, and the grain boundary components undergo an irreversible phase change at 14 GPa. We show that the blueshift in the pressure-dependent vibrational modes correlates with the negative pressure coefficient of Tc in BDD. The analysis of x-ray diffraction data determines the equation of state of the BDD film, revealing a high bulk modulus of B0=510±28 GPa. The comparative analysis of high-pressure data clarified that the sp2 carbons in the grain boundaries transform into hexagonal diamond.
Similar papers
High-pressure behavior of superconducting boron-doped diamond
similarity 0.91Mahmoud Abdel-Hafiez et al. · 2017 · arXiv:1709.07611
Source status unknown — claims are unverified
Lattice parameters and thermal expansion of superconducting boron-doped diamonds
similarity 0.91V. V. Brazhkin et al.
Source status unknown — claims are unverified
Superconductivity in Boron-Doped Diamond
similarity 0.90K.-W. Lee & W. E. Pickett
Source status unknown — claims are unverified
Modulation of superconductivity and superhardness in XB4C4 (X=Be,B,Al,Si,P, and Ti) borocarbides at ambient pressure
similarity 0.89Qiwen Jiang et al.
Source status unknown — claims are unverified