Enhancement of superconducting transition temperature due to antiferromagnetic spin fluctuation in iron-pnictides LaFe(As1-xPx)(O1-yFy) : 31P-NMR Studies
Enhancement of superconducting transition temperature due to antiferromagnetic spin fluctuation in iron-pnictides LaFe(As1-xPx)(O1-yFy) : 31P-NMR Studies
复制标题
铁磷族化合物 LaFe(As1-xPx)(O1-yFy) 中反铁磁自旋涨落导致超导转变温度提高： 31P-NMR 研究
DOI：
10.1103/physrevb.89.064511
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发表时间：
2014
影响因子：
3.7
通讯作者：
S. Tajima
中科院分区：
文献类型：
--
作者：
H. Mukuda;F. Engetsu;K. Yamamoto;K. T. Lai;M. Yashima;Y. Kitaoka;A. Tamemori;S. Miyasaka;S. Tajima
对LaFe()和0.1的系统P-核磁共振研究表明，在低能下，反铁磁自旋涨落(AFMSF)显著增强，分别在0.4和0.4附近，结果是在24K和27K出现峰值。这一结果表明，AFMSF作为库珀配对的主要调解人，对Lafe()()的增加负有责任。从AFMSF与一系列()化合物的系统比较中，我们指出，在FeAs四面体的局域晶格参数接近正四面体的条件下，适度发展的AFMSF可以使AFMSF增加到50K。我们认为，在AFMSF的密切合作和其他源于局部结构优化的因素的共同作用下，超过50K的铁多肽的量是最大的。
SystematicP-NMR studies on LaFe()() withand 0.1 have revealed that the antiferromagnetic spin fluctuations (AFMSFs) at low energies are markedly enhanced aroundand 0.4, respectively, and as a result,exhibits respective peaks at 24 and 27 K against the P substitution for As. This result demonstrates that the AFMSFs are responsible for the increase infor LaFe()() as a primary mediator of the Cooper pairing. From a systematic comparison of AFMSFs with a series of ()compounds in whichreaches 50 K for, we remark that a moderate development of AFMSFs causesto increase up to 50 K under the condition that the local lattice parameters of the FeAs tetrahedron approach those of the regular tetrahedron. We propose thatof Fe-pnictides exceeding 50 K is maximized under an intimate collaboration of the AFMSFs and other factors originating from the optimization of the local structure.