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SUMMARY:Hydrogen impurity in MgO as seen by the muonium analogue
DTSTART;VALUE=DATE-TIME:20220829T164000Z
DTEND;VALUE=DATE-TIME:20220829T170000Z
DTSTAMP;VALUE=DATE-TIME:20220826T110145Z
UID:indico-contribution-3725@indico.stfc.ac.uk
DESCRIPTION:Speakers: Ali Roonkiani (CFisUC\, Department of Physics\, Univ
 ersity of Coimbra)\nWe present a joint muSR and ab-initio study of the hyd
 rogen impurity in magnesium oxide (MgO). Muon spin rotation measurements a
 t magnetic high-fields reveal the presence of a diamagnetic configuration 
 and of a muonium state\, confirming an hyperfine interaction of 3.9(1) GHz
  at T=6K [1]. The temperature dependence of these states is followed up to
  room temperature\, revealing a conversion of the muonium to the diamagnet
 ic state. Ab-initio density-functional theory (DFT) calculations further c
 haracterize the local atomistic (or microscopic) structure of these two co
 nfigurations\, the atomic muonium state corresponding to an interstitial l
 ocation in the magnesium oxide lattice and the diamagnetic configuration c
 orresponding to an oxygen-bound location.\n\n[1] R. F. Kiefl et al.\, Phys
 . Rev. B 34 (1986) 1474\n\n![FFT of MuSR spectrum of MgO at T=6K and B=2T.
 ][1]\n\n\n\n  [1]: http://algol.fis.uc.pt/muon/FFT_Fig.jpg\n\nhttps://indi
 co.stfc.ac.uk/event/53/contributions/3725/
LOCATION:Science and Technology Campus\, University of Parma
URL:https://indico.stfc.ac.uk/event/53/contributions/3725/
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