Magnetic field dependence of spin-lattice relaxation in the s(+/-) state of Ba0.67K0.33Fe2As2

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	Magnetic field dependence of spin-lattice relaxation in the s(+/-) state of Ba0.67K0.33Fe2As2
	Oh, S ; Mounce, AM ; Halperin, WP ; Zhang, CL ; Dai, PC ; Reyes, AP ; Kuhns, PL
刊名	PHYSICAL REVIEW B
	2012
卷号	85 期号:17
关键词	MIXED-STATE VORTEX SUPERCONDUCTORS DIFFUSION VORTICES
ISSN号	1098-0121
通讯作者	Oh, S: Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA.
中文摘要	The spatially averaged density of states < N(0)> of an unconventional d-wave superconductor is magnetic field dependent, proportional to H-1/2, owing to the Doppler shift of quasiparticle excitations in a background of vortex supercurrents [G. E. Volovik, J. Phys. C 21, L221 (1988); JETP Lett. 58, 469 (1993)]. This phenomenon, called the Volovik effect, has been predicted to exist for a sign-changing s(+/-) state [Y. Bang, Phys. Rev. Lett. 104, 217001 (2010)], although it is absent in a single-band s-wave superconductor. Consequently, we expect there to be Doppler contributions to the NMR spin-lattice relaxation rate, 1/T-1 proportional to < N(0)(2)>, for an s(perpendicular to) state which will depend on the magnetic field. We have measured the As-75 1/T-1 in a high-quality single crystal of Ba0.67K0.33Fe2As2 over a wide range of field up to 28 T. Our spatially resolved measurements show that indeed there are Doppler contributions to 1/T-1 which increase closer to the vortex core, with a spatial average proportional to H-2, inconsistent with recent theory [Y. Bang, Phys. Rev. B 85, 104524 (2012)].
收录类别	SCI
资助信息	US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-FG02-05ER46248, DE-FG02-05ER46202]; National Science Foundation; State of Florida
语种	英语
公开日期	2013-09-18
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/41207]
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	Oh, S,Mounce, AM,Halperin, WP,et al. Magnetic field dependence of spin-lattice relaxation in the s(+/-) state of Ba0.67K0.33Fe2As2[J]. PHYSICAL REVIEW B,2012,85(17).
APA	Oh, S.,Mounce, AM.,Halperin, WP.,Zhang, CL.,Dai, PC.,...&Kuhns, PL.(2012).Magnetic field dependence of spin-lattice relaxation in the s(+/-) state of Ba0.67K0.33Fe2As2.PHYSICAL REVIEW B,85(17).
MLA	Oh, S,et al."Magnetic field dependence of spin-lattice relaxation in the s(+/-) state of Ba0.67K0.33Fe2As2".PHYSICAL REVIEW B 85.17(2012).