High-pressure behavior of superconducting boron-doped diamond

被引：18

作者：

Abdel-Hafiez, Mahmoud ^{[1
]}

Kumar, Dinesh ^{[2
,3
]}

Thiyagarajan, R. ^{[4
]}

Zhang, Q. ^{[4
]}

Howie, R. T. ^{[4
]}

Sethupathi, K. ^{[5
]}

Volkova, O. ^{[6
,7
,8
]}

Vasiliev, A. ^{[6
,8
,9
]}

Yang, W. ^{[4
]}

Mao, H. K. ^{[4
]}

Rao, M. S. Ramachandra ^{[2
,3
]}

机构：

[1] Ctr High Pressure Sci & Technol Adv Res, Beijing 100094, Peoples R China

[2] Indian Inst Technol, Dept Phys, Nano Funct Mat Technol Ctr, Madras 600036, Tamil Nadu, India

[3] Indian Inst Technol, Mat Sci Res Ctr, Madras 600036, Tamil Nadu, India

[4] Ctr High Pressure Sci & Technol Adv Res, Shanghai 201203, Peoples R China

[5] Indian Inst Technol, Dept Phys, Low Temp Phys Lab, Madras 600036, Tamil Nadu, India

[6] Moscow MV Lomonosov State Univ, Phys Fac, Low Temp Phys & Superconduct Dept, Moscow 119991, Russia

[7] Ural Fed Univ, Theoret Phys & Appl Math Dept, Ekaterinburg 620002, Russia

[8] Natl Univ Sci & Technol MISiS, Moscow 119049, Russia

[9] Natl Res South Ural State Univ, Chelyabinsk 454080, Russia

来源：

PHYSICAL REVIEW B | 2017年 / 95卷 / 17期

关键词：

IMPURITY BAND SUPERCONDUCTIVITY; EQUATION-OF-STATE; CRITICAL-FIELD; NANOCRYSTALLINE DIAMOND; RAMAN-SPECTRA; TEMPERATURE; TRANSITION; DEPENDENCE; GRAPHITE; INSIGHT;

D O I：

10.1103/PhysRevB.95.174519

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 blueshift 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 +/- 28 GPa. The comparative analysis of high-pressure data clarified that the sp(2) carbons in the grain boundaries transform into hexagonal diamond.

引用

页数：7

共 50 条

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