Unconventional London penetration depth in Ba(Fe0.93Co0.07)2As2 single crystals

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dc.creatorGordon, R. T.
dc.creatorNi, N.
dc.creatorMartin, C.
dc.creatorTanatar, M. A.
dc.creatorVannette, M. D.
dc.creatorKim, H.
dc.creatorSamolyuk, G.
dc.creatorSchmalian, J.
dc.creatorNandi, S.
dc.creatorKreyssig, A.
dc.creatorGoldman, A. I.
dc.creatorYan, J. Q.
dc.creatorBud'ko, S. L.
dc.creatorCanfield, P. C.
dc.creatorProzorov, R.
dc.date2008-10-13
dc.date.accessioned2026-07-07T12:56:45Z
dc.date.available2026-07-07T12:56:45Z
dc.descriptionThe London penetration depth, $λ(T)$, has been measured in several single crystals of Ba(Fe$_{0.93}$Co$_{0.07}$)$_2$As$_2$. Thermodynamic, electromagnetic, and structural characterization measurements confirm that these crystals are of excellent quality. The observed low temperature variation of $λ(T)$ follows a power-law, $Δλ(T) \sim T^n$ with $n=2.4 \pm 0.1$, indicating the existence of normal quasiparticles down to at least $0.02T_c$. This is in contrast to recent penetration depth measurements on single crystals of NdFeAsO$_{1-x}$F$_x$ and SmFeAsO$_{1-x}$F$_x$, which indicate an anisotropic but nodeless gap. We propose that a more three-dimensional character in the electronic structure of Ba(Fe$_{0.93}$Co$_{0.07}$)$_2$As$_2$ may lead to an anisotropic $s-$wave gap with point nodes that would explain the observed $λ(T)$.
dc.description4 pages
dc.identifierhttps://arxiv.org/abs/0810.2295
dc.identifierhttp://arxiv.org/abs/0810.2295
dc.identifierPhys. Rev. Lett. 102, 127004 (2009)
dc.identifierdoi:10.1103/PhysRevLett.102.127004
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/224689
dc.subjectSuperconductivity
dc.titleUnconventional London penetration depth in Ba(Fe0.93Co0.07)2As2 single crystals
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