Superconducting properties of well-shaped MgB2 single crystals
Superconducting properties of well-shaped MgB2 single crystals
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DOI：
10.1103/physrevb.65.100510
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发表时间：
2001-05
影响因子：
3.7
通讯作者：
Kijoon H. P. Kim;Jae-Hyuk Choi;C. Jung;P. Chowdhury;min-Seok Park;Heon-Jung Kim;J. Y. Kim;Zhonglian Du;E. Choi;Mun-Seog Kim;W. Kang;Sung-Ik Lee;G. Sung;J. Y. Lee
中科院分区：
文献类型：
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作者：
Kijoon H. P. Kim;Jae-Hyuk Choi;C. Jung;P. Chowdhury;min-Seok Park;Heon-Jung Kim;J. Y. Kim;Zhonglian Du;E. Choi;Mun-Seog Kim;W. Kang;Sung-Ik Lee;G. Sung;J. Y. Lee
我们报告的高品质，亚毫米尺寸的${\mathrm {MgB}}_{2}$单晶的运输和磁性能的测量具有清晰的六方板形状。低场磁化强度和磁滞曲线表明，这些晶体的体钉扎是非常弱的。从零场电阻曲线得到的德拜温度为${\ensuremath {\Theta}}_{D}\ensuremath {\sim} 1100\mathrm {K}，$表明正常态的输运性质主要由电子-声子相互作用决定。在40 K和300 K之间的电阻率比约为5，在32 K附近的上临界场各向异性比为3.0\ifmmode\pm\else\textpm\fi {} 0.2 $。
We report measurements of the transport and the magnetic properties of high-quality, sub-millimeter-sized ${\mathrm{MgB}}_{2}$ single crystals with clear hexagonal-plate shapes. The low-field magnetization and the magnetic hysteresis curves show the bulk pinning of these crystals to be very weak. The Debye temperature of ${\ensuremath{\Theta}}_{D}\ensuremath{\sim}1100 \mathrm{K},$ obtained from the zero-field resistance curve, suggests that the normal-state transport properties are dominated by electron-phonon interactions. The resistivity ratio between 40 K and 300 K was about 5, and the upper critical field anisotropy ratio was $3.0\ifmmode\pm\else\textpm\fi{}0.2$ at temperatures around 32 K.