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SUMMARY:A MaxEnt-μSR study:  Precursor effects of the Fe3O4 Verwey transi
 tion
DTSTART;VALUE=DATE-TIME:20220901T164000Z
DTEND;VALUE=DATE-TIME:20220901T170000Z
DTSTAMP;VALUE=DATE-TIME:20220826T121832Z
UID:indico-contribution-3764@indico.stfc.ac.uk
DESCRIPTION:Speakers: Carolus Boekema (San Jose State University)\nUsing m
 uon-spin rotation (μSR) [1] the magnetic fields of Fe3O4 have been previo
 usly investigated.  The Verwey transition at Tv (~123 K) and a transition 
 at Tw (~247 K) are observed.  Using Maximum-Entropy (MaxEnt) μSR data of 
 single-crystal Fe3O4 are analyzed with much improved precision. [2\,3]  We
  review earlier results [3] and report on our analysis of the temperature 
 dependence of fields with B (720 Oe) // .  Below the demagnetization field
 \, extra μSR signals are found at Bext //  indicating two frequencies at 
 room temperature (RT) and two at 205 K. [3]  At RT\, the upper frequency f
 ollows the zero-field trend seen in the Tv-Tw region of the zero-field (ZF
 ) phase diagram.  At 205 K\, the lower frequency follows the extension of 
 the ZF trend above Tw.  These two ZF trends indicate plausible short-range
  ordering related to the “extra” 3d-electron conduction behavior.  Thi
 s should further be interpreted as precursor effects to the Tv transition.
  [1]  Our MaxEnt-μSR finding is consistent with diffuse [4] & x-ray [5] s
 cattering results above Tv providing a clear picture of the magnetic envir
 onments in Fe3O4.  This new interpretation indicates two T-dependent magne
 tizations\, reflecting different short-range orders [3-5] in the ZF phase 
 diagram of this Mott-Wigner glass.[6]\nResearch supported by LANL-DOE\, SJ
 SU & AFC San Jose.\n[1]  C. Boekema et al\, Phys Rev B33 (1986) 2102\;  Ph
 ys Rev B31 (1985) 1233 & references therein. \n[2] C Boekema and MC Browne
 \, MaxEnt 2008\, AIP Conf Proc #1073 (2008) 260. \n[3] C Morante and C Boe
 kema\, AIP Advances 10 (2020).025005. \n[4] A Bosak et al\, Phys Rev X4 (2
 014) 011040. \n[5] G Perversi et al\, Nature Comm 10 (2019).2857. \n[6] JH
 VJ Brabers et al\, J Physics Condensed Matter 12 (2000) 5437.\n\nhttps://i
 ndico.stfc.ac.uk/event/53/contributions/3764/
LOCATION:Science and Technology Campus\, University of Parma
URL:https://indico.stfc.ac.uk/event/53/contributions/3764/
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