Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Single-Crystal like MgB2 thin films grown on c-cut sapphire substrates

  • Duong, Pham Van (BK21 Physic Division and Department of Physic, Sungkyunkwan University) ;
  • Ranot, Mahipal (BK21 Physic Division and Department of Physic, Sungkyunkwan University) ;
  • Kang, Won Nam (BK21 Physic Division and Department of Physic, Sungkyunkwan University)
  • Received : 2014.09.04
  • Accepted : 2014.09.29
  • Published : 2014.09.30
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Abstract

Single-crystal like $MgB_2$ thin film was grown on (000l) $Al_2O_3$ substrate by using hybrid physical-chemical vapor deposition (HPCVD) system. Single crystal properties were studied by X-ray diffraction (XRD) and the full width at half maximum (FWHM) of the (0001) $MgB_2$ peak is $15^{\circ}$, which is very close to that has been reported for $MgB_2$ single-crystal. It indicates that the crystalline quality of thin film is good. Temperature dependence on resistivity was investigated by physical property measurement system (PPMS) in various applied fields from 0 to 9 T. The upper critical field ($H_{c2}$) and irreversibility field ($H_{irr}$) were determined from PPMS data, and the estimated values are comparable with that of $MgB_2$ single-crystals. The thin film shows a high critical temperature ($T_c$) of 40.4 K with a sharp superconducting transition width of 0.2 K, and a high residual resistivity ratio (RRR=21), it reflects that $MgB_2$ thin film has a pure phase structure.

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References

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