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SUMMARY:Magnetic dopants and spin-density waves: the SmFe$_{1-x}$Mn$_x$AsO
  case
DTSTART;VALUE=DATE-TIME:20220830T164000Z
DTEND;VALUE=DATE-TIME:20220830T170000Z
DTSTAMP;VALUE=DATE-TIME:20220826T120739Z
UID:indico-contribution-3751@indico.stfc.ac.uk
DESCRIPTION:Speakers: T. Shiroka (Laboratory for Muon-Spin Spectroscopy\, 
 Paul Scherrer Institut)\nElectronic correlations play a key role in tuning
  the properties of parent- and doped (superconducting) iron pnictides\, ul
 timately determining their respective ground states. Parent compounds with
  magnetic doping are particularly intriguing\, since dopant coupling via R
 uderman-Kittel-Kasuya-Yosida (RKKY) interactions depends significantly on 
 the strength of electronic correlations\, which interact with the underlyi
 ng SDW phase. \n\nHere\, we address the interesting case of Fe-to-Mn subst
 itution in the SmFeAsO parent compound [1] through comparative studies of 
 SmFe$_{1-x}$Mn$_x$AsO\, with $x$(Mn) = 0.05 and 0.10\, via dc-magnetizatio
 n\, Hall-effect\, and muon‑spin spectroscopy measurements. Our main expe
 rimental findings are: (i) the Fe-to-Mn substitution weakens the commensur
 ate spin-density wave (SDW) order of iron\, whose transition temperature d
 ecreases with increasing Mn content. (ii) At low temperature\, well inside
  the SDW ordered phase\, an additional magnetic order sets in at $T^*\\sim
 $ 10 K and 20 K\, for $x$ = 0.05 and 0.10\, respectively. We demonstrate t
 hat diluted Mn ions can pin the electronic charges and thus induce a radic
 al reconstruction of the Fermi surface\, in turn responsible for a commens
 urate-to-incommensurate antiferromagnetic (AF) transition at $T^*$.\n\n\n[
 1] M. Meinero\, P. Bonfà\, I. J. Onuorah\, S. Sanna\, R. De Renzi\, I. Er
 emin\, M. A. Müller\, J.‑C. Orain\, A. Martinelli\, A. Provino\, P. Man
 frinetti\, M. Putti\, T. Shiroka and G. Lamura\, *Scientific Reports* **11
 **\, 14373 (2021)\, https://doi.org/10.1038/s41598-021-93625-7.\n\nhttps:/
 /indico.stfc.ac.uk/event/53/contributions/3751/
LOCATION:Science and Technology Campus\, University of Parma
URL:https://indico.stfc.ac.uk/event/53/contributions/3751/
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