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http://dx.doi.org/10.9714/psac.2014.16.3.007

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)
Publication Information
Progress in Superconductivity and Cryogenics / v.16, no.3, 2014 , pp. 7-9 More about this Journal
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.
Keywords
$MgB_2$ thin film; Single-crystal; HPCVD;
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