Power-law-like correlation between condensation energy and superconducting transition temperatures in iron pnictide/chalcogenide superconductors: Beyond the BCS understanding

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	Power-law-like correlation between condensation energy and superconducting transition temperatures in iron pnictide/chalcogenide superconductors: Beyond the BCS understanding
	Xing, J ; Li, S ; Zeng, B ; Mu, G ; Shen, B ; Schneeloch, J ; Zhong, RD ; Liu, TS ; Gu, GD ; Wen, HH
刊名	PHYSICAL REVIEW B
	2014
卷号	89 期号:14
ISSN号	1098-0121
通讯作者	Xing, J (reprint author), Nanjing Univ, Natl Lab Solid State Microstruct, Ctr Superconducting Phys & Mat, Nanjing 210093, Jiangsu, Peoples R China.
中文摘要	Superconducting condensation energy U-0(int) has been determined by integrating the electronic entropy in various iron pnictide/chalcogenide superconducting systems. It is found that U-0(int) infinity T-c(n) with n = 3-4, which is in sharp contrast to the simple BCS prediction U-0(BCS) = 1/2N(F)Delta(2)(s), with N-F the quasiparticle density of states at the Fermi energy and Delta(s) the superconducting gap. A similar correlation holds if we compute the condensation energy through U-0(cal) = 3 gamma(eff)(n) Delta(2)(s)/4 pi(2)k(B)(2), with gamma(eff)(n) the effective normal state electronic specific heat coefficient. This indicates a general relationship gamma(eff)(n) infinity T-c(m) with m = 1-2, which is not predicted by the BCS scheme. A picture based on quantum criticality is proposed to explain this phenomenon.
资助信息	Ministry of Science and Technology of China [2011CBA00102, 2010CB923002, 2012CB821403]; NSF of China; NCET project; PAPD; DOE [DE-AC02-98CH10886]
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/59553]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Xing, J,Li, S,Zeng, B,et al. Power-law-like correlation between condensation energy and superconducting transition temperatures in iron pnictide/chalcogenide superconductors: Beyond the BCS understanding[J]. PHYSICAL REVIEW B,2014,89(14).
APA	Xing, J.,Li, S.,Zeng, B.,Mu, G.,Shen, B.,...&Wen, HH.(2014).Power-law-like correlation between condensation energy and superconducting transition temperatures in iron pnictide/chalcogenide superconductors: Beyond the BCS understanding.PHYSICAL REVIEW B,89(14).
MLA	Xing, J,et al."Power-law-like correlation between condensation energy and superconducting transition temperatures in iron pnictide/chalcogenide superconductors: Beyond the BCS understanding".PHYSICAL REVIEW B 89.14(2014).