ISOLDE Workshop and Users meeting 2014 "50th Anniversary Edition"

Jahn-Teller distortions study in Sm(Nd)MnO3 Manganites

Not scheduled

20m

503/1-001 - Council Chamber (CERN)

Poster

Speaker

Ricardo Cesar Carvalho Teixeira (Instituto Superior Tecnico (PT))

Description

Manganites and their exquisite electronic properties have been extensively studied in the last decade due to both fundamental interest and possible applications of colossal magnetoresistance, magnetocaloric and multiferroicc properties [1,2]. Additionally, low-cost AMnO₃ and doped manganites have shown promising results for catalysts solutions [3,4]. In these systems orbital occupancy of the metal ion, orbital order and the Jahn-Teller effect have a critical role on the macroscopic materials properties. In this work we will present the evolution of the local Jahn-Teller distortion across the Jahn-Teller phase transition studied with perturbed angular correlation technique. The local single-phase scenario, where the electron density is regularly distributed around the Mn sites versos the phase separation picture, where fully Jahn-Teller distorted Mn³⁺O₆ octahedra coexist with regular Mn³⁺O₆ ones, will be discussed. [1] A. Shuvaev et al, Phys. Rev. Lett. 111, 227201 (2013)
[2] A M Shuvaev et al, J. Phys.: Condens. Matter 23, 113201 (2011)
[3] E D Wachsman and T K Lee, Science 334, 935 (2011)
[4] J Suntivich et al, Nature Chemistry 3, 546 (2011)