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Structure-property correlations in phase-pure B-doped Q-carbon high-temperature superconductor with a record Tc = 55 K.
Nanoscale 2019; 11(18):9141-9154N

Abstract

Here, we report the detailed structure-property correlations in phase-pure B-doped Q-carbon high-temperature superconductor having a superconducting transition temperature (Tc) of 55 K. This superconducting phase is a result of nanosecond laser melting and subsequent quenching of a highly super undercooled state of molten B-doped C. The temperature-dependent resistivity in different magnetic fields and magnetic susceptibility measurements indicate a type-II Bardeen-Cooper-Schrieffer superconductivity in B-doped Q-carbon thin films. The magnetic measurements indicate that the upper and lower critical fields follow Hc2(0)[1 - (T/Tc)1.77] and Hc1(0)[1 - (T/Tc)1.19] temperature dependence, respectively. The structure-property characterization of B-doped Q-carbon indicates a high density of electronic states near the Fermi-level and large electron-phonon coupling. These factors are responsible for s-wave bulk type superconductivity with enhanced Tc in B-doped Q-carbon. The time-dependent magnetic moment measurements indicate that B-doped Q-carbon thin films follow the Anderson-Kim logarithmic decay model having high values of pinning potential at low temperatures. The crossover from the two-dimensional to the three-dimensional nature of Cooper pair transport at T/Tc = 1.02 also indicates a high value of electron-phonon coupling which is also calculated using the McMillan formula. The superconducting region in B-doped Q-carbon is enclosed by Tc = 55.0 K, Jc = 5.0 × 108 A cm-2, and Hc2 = 9.75 T superconducting parameters. The high values of critical current density and pinning potential also indicate that B-doped Q-carbon can be used for persistent mode of operation in MRI and NMR applications. The Cooper pairs which are responsible for the high-temperature superconductivity are formed when B exists in the sp3 sites of C. The electron energy loss spectroscopy and Raman spectroscopy indicate a 75% sp3 bonded C and 70% sp3 bonded B in the superconducting phase of B-doped Q-carbon which has 27 at% B and rest C. The dimensional fluctuation and magnetic relaxation measurements in B-doped Q-carbon indicate its practical applications in frictionless motors and high-speed electronics. This discovery of high-temperature superconductivity in strongly-bonded and light-weight materials using non-equilibrium synthesis will provide the pathway to achieve room-temperature superconductivity.

Authors+Show Affiliations

Department of Materials Science and Engineering, Centennial Campus, North Carolina State University, Raleigh, NC 27695-7907, USA. narayan@ncsu.edu.No affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31038149

Citation

Bhaumik, Anagh, and Jagdish Narayan. "Structure-property Correlations in Phase-pure B-doped Q-carbon High-temperature Superconductor With a Record Tc = 55 K." Nanoscale, vol. 11, no. 18, 2019, pp. 9141-9154.
Bhaumik A, Narayan J. Structure-property correlations in phase-pure B-doped Q-carbon high-temperature superconductor with a record Tc = 55 K. Nanoscale. 2019;11(18):9141-9154.
Bhaumik, A., & Narayan, J. (2019). Structure-property correlations in phase-pure B-doped Q-carbon high-temperature superconductor with a record Tc = 55 K. Nanoscale, 11(18), pp. 9141-9154. doi:10.1039/c9nr00562e.
Bhaumik A, Narayan J. Structure-property Correlations in Phase-pure B-doped Q-carbon High-temperature Superconductor With a Record Tc = 55 K. Nanoscale. 2019 May 9;11(18):9141-9154. PubMed PMID: 31038149.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Structure-property correlations in phase-pure B-doped Q-carbon high-temperature superconductor with a record Tc = 55 K. AU - Bhaumik,Anagh, AU - Narayan,Jagdish, PY - 2019/5/1/pubmed PY - 2019/5/1/medline PY - 2019/5/1/entrez SP - 9141 EP - 9154 JF - Nanoscale JO - Nanoscale VL - 11 IS - 18 N2 - Here, we report the detailed structure-property correlations in phase-pure B-doped Q-carbon high-temperature superconductor having a superconducting transition temperature (Tc) of 55 K. This superconducting phase is a result of nanosecond laser melting and subsequent quenching of a highly super undercooled state of molten B-doped C. The temperature-dependent resistivity in different magnetic fields and magnetic susceptibility measurements indicate a type-II Bardeen-Cooper-Schrieffer superconductivity in B-doped Q-carbon thin films. The magnetic measurements indicate that the upper and lower critical fields follow Hc2(0)[1 - (T/Tc)1.77] and Hc1(0)[1 - (T/Tc)1.19] temperature dependence, respectively. The structure-property characterization of B-doped Q-carbon indicates a high density of electronic states near the Fermi-level and large electron-phonon coupling. These factors are responsible for s-wave bulk type superconductivity with enhanced Tc in B-doped Q-carbon. The time-dependent magnetic moment measurements indicate that B-doped Q-carbon thin films follow the Anderson-Kim logarithmic decay model having high values of pinning potential at low temperatures. The crossover from the two-dimensional to the three-dimensional nature of Cooper pair transport at T/Tc = 1.02 also indicates a high value of electron-phonon coupling which is also calculated using the McMillan formula. The superconducting region in B-doped Q-carbon is enclosed by Tc = 55.0 K, Jc = 5.0 × 108 A cm-2, and Hc2 = 9.75 T superconducting parameters. The high values of critical current density and pinning potential also indicate that B-doped Q-carbon can be used for persistent mode of operation in MRI and NMR applications. The Cooper pairs which are responsible for the high-temperature superconductivity are formed when B exists in the sp3 sites of C. The electron energy loss spectroscopy and Raman spectroscopy indicate a 75% sp3 bonded C and 70% sp3 bonded B in the superconducting phase of B-doped Q-carbon which has 27 at% B and rest C. The dimensional fluctuation and magnetic relaxation measurements in B-doped Q-carbon indicate its practical applications in frictionless motors and high-speed electronics. This discovery of high-temperature superconductivity in strongly-bonded and light-weight materials using non-equilibrium synthesis will provide the pathway to achieve room-temperature superconductivity. SN - 2040-3372 UR - https://www.unboundmedicine.com/medline/citation/31038149/Structure_property_correlations_in_phase_pure_B_doped_Q_carbon_high_temperature_superconductor_with_a_record_Tc_=_55_K_ L2 - https://doi.org/10.1039/c9nr00562e DB - PRIME DP - Unbound Medicine ER -