Observation of muon-fluorine "hydrogen bonding" in ionic crystals

Two-dimensionalXYbehavior observed in quasi-two-dimensional quantum Heisenberg antiferromagnets

“…9(c)) we observe oscillations in the time dependence of the muon polarization (the "asymmetry" A(t) ) which are characteristic of a quasi-static Above T N the character of the measured spectra changes considerably ( Fig.9(a) and (b)) and we observe lower frequency oscillations characteristic of the dipole-dipole interaction of the muon and the 19 F nuclei comprising the BF 4 counter-ions. This behavior [27] has been observed previously in systems of this kind [28]. Fits to the data show that the muon stops between two fluorine atoms and the resulting F-µ + -F spin system consists of four distinct energy levels with three allowed transitions between them (inset, Fig.…”

Muon Spin Rotation Studies of Spin Dynamics at Avoided Level Crossings inLiY0.998Ho0.002F4

“…Earlier zero field μ + SR results on these samples [7] showed that nearly all the muons are trapped by pairs of adjacent F -ions, forming the stable three-spin system F-μ-F [9]. In zeromagnetic field this system produces spin-flip oscillations at three non-zero frequencies ( ) ( ) small positive correction that increases as 2 , which provides a qualitative understanding of the third result above [10].…”

Magnetic phases of skyrmion-hostingGaV4S8−ySey(y=0,2Franke1, Huddart2, Hicken3 et al. 2018Phys. Rev. B322323View full textAdd to dashboardCite

“…This site is therefore best described in terms of the muon forming a μ + -S bond (rather than an S-μ + -S state by analogy to the commonly observed F-μ + -F complex [46]), though the presence of a second nearby S atom does seem to stabilize this geometry. Two further sites involve the muon sitting close to a single S atom.…”