de Haas-van Alphen Study of the Fermi Surfaces of Superconducting LiFeP and LiFeAs
de Haas-van Alphen Study of the Fermi Surfaces of Superconducting LiFeP and LiFeAs
复制标题
超导 LiFeP 和 LiFeAs 费米面的 de Haas-van Alphen 研究
DOI：
10.1103/physrevlett.108.047002
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
C. Putzke
中科院分区：
文献类型：
--
作者：
Hiroshi Yamada-Kaneta;Satoru Komatsu;Shotaro Baba;Yuta Nagai;Mitsuhiro Akatsu;Yuichi Nemoto,Terutaka Goto;C. Putzke
本文报道了111个铁磷属化合物超导体LiFeAs和LiFeP的de Haas-van Alphen振荡研究。我们发现，对于这两种化合物的费米表面拓扑结构是在很好的协议与密度泛函能带结构计算，几乎嵌套的电子和空穴带。有效质量普遍显示出显著的增强，对于LiFeP和LiFeAs，有效质量增加到。然而，在LiFeP中的一个空穴费米面显示出非常小的增强，与它的其他片相比。这种差异可能是由于依赖于k的自旋涨落耦合，并可能是不同的节和无节超导间隙结构的起源，分别在LiFeP和LiFeAs。
We report a de Haas–van Alphen oscillation study of the 111 iron pnictide superconductors LiFeAs withand LiFeP with. We find that for both compounds the Fermi surface topology is in good agreement with density functional band-structure calculations and has almost nested electron and hole bands. The effective masses generally show significant enhancement, up tofor LiFeP andfor LiFeAs. However, one hole Fermi surface in LiFeP shows a very small enhancement, as compared with its other sheets. This difference probably results from k-dependent coupling to spin fluctuations and may be the origin of the different nodal and nodeless superconducting gap structures in LiFeP and LiFeAs, respectively.