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SUMMARY:Exploting magnetic interactions in Kitaev anti-ferromagnet Na$_{2}
 $PrO$_{3}$
DTSTART;VALUE=DATE-TIME:20220829T092000Z
DTEND;VALUE=DATE-TIME:20220829T094000Z
DTSTAMP;VALUE=DATE-TIME:20220826T105653Z
UID:indico-contribution-3643@indico.stfc.ac.uk
DESCRIPTION:Speakers: Jonathan Frassineti (University of Bologna)\nOur goa
 l is to analyze the magnetic properties of the Kitaev material Na$_{2}$PrO
 $_{3}$ by comparing Neutron Scattering (NS) and  Muon Spin Spectroscopy (
 μSR) experiments\, with the addition of ab initio calculations. \n\nAlkal
 i-metal lanthanide oxides are an exciting field of study due to their frus
 trated geometry and possibly anisotropic magnetic interactions\, as shown 
 in Fig.1. \n\n![Schematic diagram of Kitaev honeycomb lattice\, with aniso
 tropic bond interactions $J_{x}$\, $J_{y}$\, $J_{z}$.][1]\n\nIn this class
  of materials\, also known as Kitaev materials\, the SOC energy is compara
 ble to that induced by crystal-field excitations (CEF)\, and the small spa
 tial extent of f-electron orbitals promotes anisotropic Kitaev terms. \n\n
 Na$_{2}$PrO$_{3}$ crystallizes with a monoclinic unit cell\, where edge-sh
 aring PrO$_{6}$ octahedra forms a honeycomb lattice. The effective paramag
 netic moment is 0.99 μB\, less than the free Pr$^{4+}$ ion moment (2.54 
 μB)\, and the origin of its small value is still under debate. In additio
 n\, it displays a magnetic ordering transition at $T_{N}$ = 4.6 K. Previou
 s powder diffraction measurements could not detect any signs of magnetic o
 rdering\, despite evidence in specific heat and magnetometry measurements.
  Moreover\, preliminary magnetic neutron diffraction results do not reveal
  any clear magnetic Bragg peaks\, probably due to the low value of Na$_{2}
 $PrO$_{3}$ effective paramagnetic moment. \n\nThe principal question that 
 motivated our work was to try to explain the small effective paramagnetic 
 moment\, considering the presence of the magnetic ordering. Thanks to the 
 muon’s extreme sensitivity to small-moment magnetism\, here μSR is high
 ly relevant. From this\, Na$_{2}$PrO$_{3}$ shows coherent oscillations of 
 the muon asymmetry below $T_{N}$\, reflecting the presence of an anti-ferr
 omagnetic (AFM) ordering. \n\nIn comparison with experimental data\, combi
 ned ab initio calculations and dipolar simulations were performed in order
  to elucidate the nature of AFM ordering inside this material and to try t
 o explain the small value of the effective paramagnetic moment. \n\n\n  [1
 ]: https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTHAUSw9gHpNLBm7bd
 bxSubER6i_KD0qkDEZA&usqp=CAU\n\nhttps://indico.stfc.ac.uk/event/53/contrib
 utions/3643/
LOCATION:Science and Technology Campus\, University of Parma
URL:https://indico.stfc.ac.uk/event/53/contributions/3643/
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