High-pressure behavior of superconducting boron-doped diamond

Abstract

This work investigates the high-pressure structure of freestanding superconducting ($T_c$ = 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 blue shift in the pressure-dependent vibrational modes correlates with the negative pressure coefficient of $T_c$ in BDD. The analysis of x-ray diffraction data determines the equation of state of the BDD film, revealing a high bulk modulus of $B_0$=510$\pm$28\,GPa. The comparative analysis of high-pressure data clarified that the sp${}^2$ carbons in the grain boundaries transform into hexagonal diamond.

arXiv comment7 pages, 4 figures

References in corpus (10)

• Superconductivity in diamond
• Three-dimensional MgB${}_2$-type superconductivity in hole-doped diamond
• Dependence of the superconducting transition temperature on the doping level in single crystalline diamond films
• The role of the dopant in the superconductivity of diamond
• Superconducting properties of sulfur-doped iron selenide
• Specific heat and upper critical field in KFe2As2 single crystals
• Superconducting and Normal State Properties of Heavily Hole-Doped Diamond
• A detailed analysis of the Raman spectra in superconducting boron doped nanocrystalline diamond
• Lower critical field and SNS-Andreev spectroscopy of 122-arsenides: Evidence of nodeless superconducting gap
• Specific heat of Ca${}_{0.32}$Na${}_{0.68}$Fe${}_2$As${}_2$ single crystals: unconventional s${}_{\pm }$ multi-band superconductivity with intermediate repulsive interband coupling and sizable attractive intraband couplings

Cited by in corpus (3)

• Pressure-induced Superconductivity in Sulfur-doped SnSe Single Crystal Using Boron-doped Diamond Electrode-prefabricated Diamond Anvil Cell
• Large Microwave Inductance of Granular Boron-Doped Diamond Superconducting Films
• Wohlleben Effect and Emergent Pi junctions in superconducting Boron doped Diamond thin films