Bulletin of the American Physical Society
APS March Meeting 2021
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session X50: Orbital Degeneracy Breaking and Emergent Local Symmetry in Transition Metal Compounds
8:00 AM–11:00 AM,
Friday, March 19, 2021
Sponsoring Unit: DCMP
Chair: Simon Kimber, University of Bourgogne
Abstract: X50.00001 : Orbital molecules in oxides*
8:00 AM–8:36 AM
(Univ of Edinburgh)
(Univ of Edinburgh)
X-ray pair distribution function (XPDF) analysis reveals that disordered orbital molecules persist to high temperatures in the vanadium spinels AlV2O4[vi] and the new analog GaV2O4.[vii,viii]. Orbital molecules may also be formed in LiV2O4 at pressure [ix]. XPDF also demonstrates that local structural fluctuations in magnetite emerge below the Curie transition at 850 K, indicating that fluctuations in Fe-Fe bonding arising from magnetic order are the primary electronic instability and hence the origin of the Verwey transition.[x]
[i] J.P. Attfield, APL Mats. 2015, 3, 041510.
[ii] M.S. Senn, J.P. Wright, J.P. Attfield, Nature 2012, 481, 173.
[iii] G. Perversi, et al, Chem. Comm. 2016, 52, 4864.
[iv] E. Pachoud, J. Cumby, G. Perversi, J.P. Wright, J.P. Attfield, Nature Comm. 2020, 11,1671.
[v] K.H. Hong, et al Nature Comm. 2018, 9, 2975.
[vi] A.J. Browne; S.A.J. Kimber; J.P. Attfield. Phys. Rev. Mat. 2017, 1, 052003.
[vii] A.J. Browne; et al Inorg. Chem. 2018, 57, 2815.
[viii] A.J. Browne; J. P. Attfield. Phys. Rev. B 2020, 101, 024112.
[ix] A.J. Browne; et al. Phys. Rev. Mat. 2020, 4, 015002.
[x] G. Perversi, et al, Nature Comm. 2019, 10, 2857.
*We thank ERC, EPSRC and STFC for support.
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