Enhanced superconductivity by rare-earth metal doping in phenanthrene
Enhanced superconductivity by rare-earth metal doping in phenanthrene
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DOI：
10.1088/0953-8984/24/34/345701
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发表时间：
2012-03
期刊：
影响因子：
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通讯作者：
X. F. Wang;Xigang Luo;J. Ying;Z. Xiang;Shuyuan Zhang;Ranran Zhang;Yufeng Zhang;Yufeng Zhang-Yufeng-Zh
中科院分区：
文献类型：
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作者：
X. F. Wang;Xigang Luo;J. Ying;Z. Xiang;Shuyuan Zhang;Ranran Zhang;Yufeng Zhang;Yufeng Zhang-Yufeng-Zh
我们成功地合成了La和Sm掺杂的菲粉末样品，并在6 K附近的Tc观察到它们的超导电性。La 1菲和Sm 1菲的Tc分别为6.1 K和6.0 K，比A3菲（A = K和Rb）和Ae 1.5菲（Ae = Sr和Ba）超导体分别提高了约1和0.5 K。在2K时，La 1菲和Sm 1菲的电子屏蔽率分别为46.1%和49.8%。磁性离子Sm ~（3+）的掺杂对Tc的影响很小，Tc的正压力依赖系数也很小，这表明在掺杂菲超导体中存在非常规的超导电性。在拉曼光谱中，从La和Sm的掺杂物到有机分子的电荷转移导致了1441 cm-1处的模的每电子7 cm-1的红移，这与在A3菲（A = K和Rb）和Ae 1.5菲（Ae = Sr和Ba）超导体中观察到的几乎相同。
We successfully synthesized La- and Sm-doped phenanthrene powder samples and observed superconductivity in them at Tc around 6 K. The Tcs are 6.1 K for La1 phenanthrene and 6.0 K for Sm1 phenanthrene, which are enhanced by about 1 and 0.5 K compared to those in A3 phenanthrene (A = K and Rb) and in Ae1.5 phenanthrene (Ae = Sr and Ba) superconductors, respectively. The superconductive shielding fractions for La1 phenanthrene and Sm1 phenanthrene are 46.1% and 49.8% at 2 K, respectively. The small effect of doping with the magnetic ion Sm3+ on Tc and the positive pressure dependence coefficient of Tc strongly suggest unconventional superconductivity in the doped phenanthrene superconductors. The charge transfer to organic molecules from dopants of La and Sm induces a redshift of 7 cm−1 per electron for the mode at 1441 cm−1 in the Raman spectra, which is almost the same as those observed in A3 phenanthrene (A = K and Rb) and Ae1.5 phenanthrene (Ae = Sr and Ba) superconductors.