A large iron isotope effect in SmFeAsO1-xFx and Ba1-xKxFe2As2

	A large iron isotope effect in SmFeAsO1-xFx and Ba1-xKxFe2As2
	Liu, RH; Wu, T; Wu, G; Chen, H; Wang, XF; Xie, YL; Ying, JJ; Yan, YJ; Li, QJ; Shi, BC
刊名	NATURE
	2009
卷号	459 期号:7243 页码:#REF!
通讯作者	Chen, XH (reprint author), Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China.
英文摘要	The recent discovery of superconductivity in oxypnictides with a critical transition temperature (T-C) higher than the McMillan limit of 39K (the theoretical maximum predicted by Bardeen-Cooper-Schrieffer theory) has generated great excitement(1-5). Theoretical calculations indicate that the electron-phonon interaction is not strong enough to give rise to such high transition temperatures(6), but strong ferromagnetic/antiferromagnetic fluctuations have been proposed to be responsible(7-9). Superconductivity and magnetism in pnictide superconductors, however, show a strong sensitivity to the crystal lattice, suggesting the possibility of unconventional electron-phonon coupling. Here we report the effect of oxygen and iron isotope substitution on T-C and the spin-density wave (SDW) transition temperature (T-SDW) in the SmFeAsO1-xFx and Ba1-xKxFe2As2 systems. The oxygen isotope effect on T-C and T-SDW is very small, while the iron isotope exponent alpha(C) =-dlnT(C)/dlnM is about 0.35 (0.5 corresponds to the full isotope effect). Surprisingly, the iron isotope exchange shows the same effect on T-SDW as T-C. This indicates that electron-phonon interaction plays some role in the superconducting mechanism, but a simple electron-phonon coupling mechanism seems unlikely because a strong magnon-phonon coupling is included.
学科主题	Science & Technology - Other Topics
类目[WOS]	Multidisciplinary Sciences
收录类别	SCI
WOS记录号	WOS:000265801300029
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/225868]
专题	高能物理研究所_多学科研究中心
推荐引用方式 GB/T 7714	Liu, RH,Wu, T,Wu, G,et al. A large iron isotope effect in SmFeAsO1-xFx and Ba1-xKxFe2As2[J]. NATURE,2009,459(7243):#REF!.
APA	Liu, RH.,Wu, T.,Wu, G.,Chen, H.,Wang, XF.,...&吴自玉.(2009).A large iron isotope effect in SmFeAsO1-xFx and Ba1-xKxFe2As2.NATURE,459(7243),#REF!.
MLA	Liu, RH,et al."A large iron isotope effect in SmFeAsO1-xFx and Ba1-xKxFe2As2".NATURE 459.7243(2009):#REF!.