000201108 001__ 201108
000201108 005__ 20181203023556.0
000201108 0247_ $$2doi$$a10.1016/j.jallcom.2014.04.129
000201108 022__ $$a0925-8388
000201108 02470 $$2ISI$$a000336606000024
000201108 037__ $$aARTICLE
000201108 245__ $$aElectric field gradient wave (EFGW) in iron-based superconductor Ba0.6K0.4Fe2As2 studied by Mossbauer spectroscopy
000201108 260__ $$aLausanne$$bElsevier Science Sa$$c2014
000201108 269__ $$a2014
000201108 300__ $$a6
000201108 336__ $$aJournal Articles
000201108 520__ $$aThe optimally doped '122' iron-based superconductor Ba0.6K0.4Fe2As2 has been studied by Fe-57 Mossbauer spectroscopy versus temperature ranging from 4.2 K till 300 K with particular attention paid to the superconducting transition around 38 K. The spectra do not contain magnetic components and they exhibit quasi-continuous distribution of quadrupole split doublets. A distribution follows the electric field gradient (EFG) spatial modulation (wave) - EFGW. The EFGW is accompanied by some charge density wave (CDW) having about an order of magnitude lesser influence on the spectrum. The EFGW could be modeled as widely separated narrow sheets with the EFG increasing from small till maximum value almost linearly and subsequently dropping back to the original value in a similar fashion - across the sheet. One encounters very small and almost constant EFG between sheets. The EFGW shape and amplitude as well as the amplitude of CDW are strongly affected by a superconducting transition. All modulations are damped significantly at transition (38 K) and recover at a temperature being about 14 K lower. The maximum quadrupole splitting at 4.2 K amounts to about 2.1 mm/s, while the dispersion of CDW seen on the iron nuclei could be estimated far away from the superconducting gap opening and at low temperature as 0.5 el./a.u.(3). It drops to about 0.3 el./a.u.(3) just below transition to the superconducting state. (C) 2014 Elsevier B.V. All rights reserved.
000201108 6531_ $$aIron-based superconductors
000201108 6531_ $$aMossbauer spectroscopy
000201108 6531_ $$aStrongly correlated electrons
000201108 700__ $$aJasek, A. K.$$uPedag Univ, Inst Phys, Mossbauer Spect Div, PL-30084 Krakow, Poland
000201108 700__ $$aKomedera, K.$$uPedag Univ, Inst Phys, Mossbauer Spect Div, PL-30084 Krakow, Poland
000201108 700__ $$aBlachowski, A.$$uPedag Univ, Inst Phys, Mossbauer Spect Div, PL-30084 Krakow, Poland
000201108 700__ $$aRuebenbauer, K.$$uPedag Univ, Inst Phys, Mossbauer Spect Div, PL-30084 Krakow, Poland
000201108 700__ $$aBukowski, Z.$$uPolish Acad Sci, Inst Low Temp & Struct Res, PL-50422 Wroclaw, Poland
000201108 700__ $$aStorey, J. G.$$uUniv Cambridge, Cavendish Lab, Cambridge CB3 0HE, England
000201108 700__ $$aKarpinski, J.$$uETH, Solid State Phys Lab, CH-8093 Zurich, Switzerland
000201108 773__ $$j609$$q150-155$$tJournal Of Alloys And Compounds
000201108 909C0 $$0252321$$pLPMC$$xU10142
000201108 909CO $$ooai:infoscience.tind.io:201108$$pSB$$particle
000201108 937__ $$aEPFL-ARTICLE-201108
000201108 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000201108 980__ $$aARTICLE