Comparison of $H_{c2}(T,\theta )$ in Mg${}_{1-x}$Al${}_x$B${}_2$ single crystals with the dirty-limit two-gap theory

Heon-Jung Kim, Hyun-Sook Lee, Byeongwon Kang +4

We studied the temperature and the angular dependences of the upper critical field ($H_{c2}(T,\theta$)) of Mg${}_{1-x}$Al${}_x$B${}_2$ single crystals ($x=0.12$ and 0.21) and compared with…