Condensed-Matter Physics & Materials Science Seminar

The perovskite manganites are examples of correlated electron systems in which charge, spin and orbital degrees of freedom can be tuned to give rise to exotic electronic ground states. In this talk I will present neutron diffraction studies performed on a novel family of manganite perovskites of stoichiometry AMn3O6, which order ferrimagnetically and adopt canted or collinear structures depending on the competition between A-B and B-B exchange
interactions [1]. These systems host novel spin reorientation phase transitions [2], exhibit an enhanced transition temperature upon non-magnetic ion doping [3], and demonstrate a spindoped Griffiths phase. Finally I will present x-ray scattering studies performed on the
perovskite BiFeO3, and the progress made towards developing a single domain multiferroic BiFeO3 device [4].
References:
[1] A. M. Vibhakar, D. D. Khalyavin, P. Manuel, L. Zhang, K. Yamaura, P. G. Radaelli, A. A.
Belik, and R. D. Johnson, Phys. Rev. B 99, 104424 (2019).
[2] A. M. Vibhakar, D. D. Khalyavin, P. Manuel, J. Liu, A. A. Belik, and R. D. Johnson, Phys.
Rev. Lett, 124, 127201, (2020).
[3] A. M. Vibhakar, D. D. Khalyavin, P. Manuel, R. Liu, K. Yamaura, A. A. Belik, and R. D.
Johnson, Phys. Rev. B 102, 214428 (2020).
[4] N. W. Price, A. M. Vibhakar, R. D. Johnson, J. Schad, W. Saenrang, A. Bombardi, F. P.
Chmiel, C. B. Eom and P. G. Radaelli, Phys. Rev. Applied 11, 024035 (2018).