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SUMMARY:Negative muon spin rotation and relaxation for energy materials
DTSTART;VALUE=DATE-TIME:20220830T101000Z
DTEND;VALUE=DATE-TIME:20220830T103000Z
DTSTAMP;VALUE=DATE-TIME:20220826T110846Z
UID:indico-contribution-3626@indico.stfc.ac.uk
DESCRIPTION:Speakers: Jun Sugiyama (CROSS Neutron Science and Technology C
 enter)\nA positive muon spin rotation and relaxation ($\\mu^{+}$SR) has be
 en widely used for assorted materials to study a microscopic internal magn
 etic field. However\, the counterpart technique\, $\\mu^{-}$SR\, is less c
 ommon mainly due to a small asymmetry of the $\\mu^{-}$SR signal\, typical
 ly 1/6 to that of $\\mu^+$SR\, caused by the loss of the spin polarization
  during a capture process of $\\mu^-$ by nuclei. This means that 36 times 
 higher statistics are needed for $\\mu^{-}$SR measurements to achieve a re
 liability comparable with the one of $\\mu^{+}$SR. Fortunately\, recent de
 velopments of the intense pulsed muon beam together with a multi-detectors
  counting system enable the measurement of the $\\mu^{-}$SR spectrum withi
 n a reasonable amount of beamtime. As a result\, we have developed a new t
 ool to detect internal magnetic fields from a fixed view point\, since the
  muonic atom (the bound state between $\\mu^-$ and an element of the targe
 t material) should be stable up to the decomposition temperature of target
  materials. This is particularly important for research on energy material
 s\, in which various atoms and/or ions are diffusing and such species coul
 d affect the local stability of the implanted $\\mu^+$ at the interstitial
  site. Here\, we summarize our $\\mu^{-}$SR results on hydrogen storage ma
 terial MgH$_2$ [1]\, cathode materials of ion batteries LiMnPO$_4$ [2] and
  Li[Ni$_{1/2}$Mn$_{3/2}$]O$_4$ [3]\, and an anode material Li$_4$Ti$_5$O$_
 {12}$ [4].\n\n[1] J. Sugiyama et al.\, Phys. Rev. Lett. ${\\bf 121}$\, 087
 202 (2018).\n[2] J. Sugiyama et al.\, Phys. Rev. Research ${\\bf 2}$\, 033
 161 (2020).\n[3] J. Sugiyama et al.\, Z. Phys. Chem. ${\\bf 236}$\, 799 (2
 022).\n[4] I. Umegaki et al.\, J. Phys. Chem. C ${\\bf 126}$\, 10506 (2022
 ).\n\nhttps://indico.stfc.ac.uk/event/53/contributions/3626/
LOCATION:Science and Technology Campus\, University of Parma
URL:https://indico.stfc.ac.uk/event/53/contributions/3626/
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