Anisotropic phase diagram and strong coupling effects in Ba1-xKxFe2As2

Simple item page
dc.creatorWelp, U.
dc.creatorXie, R.
dc.creatorKoshelev, A. E.
dc.creatorKwok, W. K.
dc.creatorLuo, H. Q.
dc.creatorWang, Z. S.
dc.creatorMu, G.
dc.creatorWen, H. H.
dc.date2008-10-10
dc.date.accessioned2026-07-07T10:09:12Z
dc.date.available2026-07-07T10:09:12Z
dc.descriptionWe present a thermodynamic study of the phase diagram of single-crystal Ba1-xKxFe2As2 using specific heat measurements. In zero-magnetic field a clear step in the heat capacity of deltaC/Tc = 0.1 J/f.u.K2 is observed at Tc = 34.6K for a sample with x = 0.4. This material is characterized by extraordinarily high slopes of the upper critical field of dHc2,c/dT= -6.5 T/K and dHc2,ab/dT= -17.4 T/K and a surprisingly low anisotropy of gamma ~ 2.6 near Tc. A consequence of the large field scale is the effective suppression of superconducting fluctuations. Using thermodynamic relations we determine Ginzburg-Landau parameters of kappac ~ 100 and kappaab ~ 260 identifying Ba1-xKxFe2As2 as extreme type-II. The large value of the normalized discontinuity of the slopes of the specific heat at Tc, (Tc/deltaC)times delta(dC/dT)~ 6 indicates strong coupling effects in Ba1-xKxFe2As2.
dc.description17 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/0810.1944
dc.identifierhttp://arxiv.org/abs/0810.1944
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/171247
dc.subjectSuperconductivity
dc.titleAnisotropic phase diagram and strong coupling effects in Ba1-xKxFe2As2
dc.typetext

Files

Collections

arXiv