Enhancing the superconducting temperature of MgB2 by SWCNT dilution

Danhao Ma, Ruwantha Jayasingha, Dustin T. Hess, Kofi W. Adu, Gamini U. Sumanasekera, Mauricio Terrones

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We report, for the first time, an increase in the superconducting critical temperature, TC of commercial "dirty" MgB2 by a nonsubstitutional hole-doping of the MgB2 structure using minute, single-wall carbon nanotube (SWCNT) inclusions. We varied the SWCNTs concentration from 0.05 wt% to 5 wt% and investigated the temperature-dependent resistivity from 10 K to 300 K. We used micro-Raman spectroscopy, field-emission scanning electron microscopy, and X-ray diffraction to analyze the interfacial interactions between the SWCNTs and the MgB2 grains. We obtained an increase in TC from 33.0 to 37.8 K (ΔTC+=4.8K), which is attributed to charge transfer from the MgB2 structure to the SWCNT structure. The charge transfer phenomenon is confirmed by micro-Raman analysis of the phonon states of the SWCNT tangential band frequency in the composites. We determined the charge transfer per carbon atom to be 0.0023/C, 0.0018/C and 0.0008/C for 0.05 wt%, 0.5 wt% and 5 wt% SWCNT inclusions, respectively, taking into account the contributions from the softening of the lattice constant and the nonadiabatic (dynamic) effects at the Fermi level. This report provides an experimental, alternative pathway to hole-doping of MgB2 without appealing to chemical substitution.

Original languageEnglish (US)
Pages (from-to)43-48
Number of pages6
JournalPhysica C: Superconductivity and its applications
Volume497
DOIs
StatePublished - Jan 1 2014

Fingerprint

Carbon Nanotubes
Dilution
dilution
Carbon nanotubes
carbon nanotubes
Charge transfer
charge transfer
Doping (additives)
inclusions
Temperature
temperature
Fermi level
Field emission
softening
Frequency bands
Lattice constants
Raman spectroscopy
field emission
critical temperature
Substitution reactions

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this

Ma, Danhao ; Jayasingha, Ruwantha ; Hess, Dustin T. ; Adu, Kofi W. ; Sumanasekera, Gamini U. ; Terrones, Mauricio. / Enhancing the superconducting temperature of MgB2 by SWCNT dilution. In: Physica C: Superconductivity and its applications. 2014 ; Vol. 497. pp. 43-48.
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abstract = "We report, for the first time, an increase in the superconducting critical temperature, TC of commercial {"}dirty{"} MgB2 by a nonsubstitutional hole-doping of the MgB2 structure using minute, single-wall carbon nanotube (SWCNT) inclusions. We varied the SWCNTs concentration from 0.05 wt{\%} to 5 wt{\%} and investigated the temperature-dependent resistivity from 10 K to 300 K. We used micro-Raman spectroscopy, field-emission scanning electron microscopy, and X-ray diffraction to analyze the interfacial interactions between the SWCNTs and the MgB2 grains. We obtained an increase in TC from 33.0 to 37.8 K (ΔTC+=4.8K), which is attributed to charge transfer from the MgB2 structure to the SWCNT structure. The charge transfer phenomenon is confirmed by micro-Raman analysis of the phonon states of the SWCNT tangential band frequency in the composites. We determined the charge transfer per carbon atom to be 0.0023/C, 0.0018/C and 0.0008/C for 0.05 wt{\%}, 0.5 wt{\%} and 5 wt{\%} SWCNT inclusions, respectively, taking into account the contributions from the softening of the lattice constant and the nonadiabatic (dynamic) effects at the Fermi level. This report provides an experimental, alternative pathway to hole-doping of MgB2 without appealing to chemical substitution.",
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Enhancing the superconducting temperature of MgB2 by SWCNT dilution. / Ma, Danhao; Jayasingha, Ruwantha; Hess, Dustin T.; Adu, Kofi W.; Sumanasekera, Gamini U.; Terrones, Mauricio.

In: Physica C: Superconductivity and its applications, Vol. 497, 01.01.2014, p. 43-48.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Enhancing the superconducting temperature of MgB2 by SWCNT dilution

AU - Ma, Danhao

AU - Jayasingha, Ruwantha

AU - Hess, Dustin T.

AU - Adu, Kofi W.

AU - Sumanasekera, Gamini U.

AU - Terrones, Mauricio

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AB - We report, for the first time, an increase in the superconducting critical temperature, TC of commercial "dirty" MgB2 by a nonsubstitutional hole-doping of the MgB2 structure using minute, single-wall carbon nanotube (SWCNT) inclusions. We varied the SWCNTs concentration from 0.05 wt% to 5 wt% and investigated the temperature-dependent resistivity from 10 K to 300 K. We used micro-Raman spectroscopy, field-emission scanning electron microscopy, and X-ray diffraction to analyze the interfacial interactions between the SWCNTs and the MgB2 grains. We obtained an increase in TC from 33.0 to 37.8 K (ΔTC+=4.8K), which is attributed to charge transfer from the MgB2 structure to the SWCNT structure. The charge transfer phenomenon is confirmed by micro-Raman analysis of the phonon states of the SWCNT tangential band frequency in the composites. We determined the charge transfer per carbon atom to be 0.0023/C, 0.0018/C and 0.0008/C for 0.05 wt%, 0.5 wt% and 5 wt% SWCNT inclusions, respectively, taking into account the contributions from the softening of the lattice constant and the nonadiabatic (dynamic) effects at the Fermi level. This report provides an experimental, alternative pathway to hole-doping of MgB2 without appealing to chemical substitution.

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