[Inageneral] RECORDATORIO Seminarios INA Primavera 2019, Primer seminario: Francisco Rivadulla 11 abril

[Raúl Mendoza]

Buenos días
Vamos a dar comienzo al ciclo de de Seminarios INA previsto programado 
para los meses de marzo a junio.
Adjunto envío cartel anunciador del primer seminario del ciclo.

Manipulation of oxygen vacancies by local electric fields in 3d oxides
Francisco Rivadulla
Jueves, 11 de abril, 12:00 h. Aula Edificio i+D

Oxygen vacancies play a central role in the physics and chemistry 
oftransition metal oxides. For the case of 3d-oxoperovskites, the 
possibility of the metal to adopt different valence states, together 
with the stability of the structure in the presence of a large number of 
vacancies in the anion sublattice, offers a vast range of possibilities 
to control the magnetic, optical and transport properties of these 
materials. However, achieving a precise control over the amount of 
vacancies and their spatial distribution is still far from possible.

In the first part of this talk I will discuss the effect of 
epitaxialstrain on the enthalpy of formation of oxygen vacancies in thin 
films of SrTiO3. I will describe the possibility of using the local 
electric field generated by an AFM-tip to create accumulation/depletion 
regions of oxygen vacancies in SrTiO3 with sub-micron resolution. 
Relaxation experiments were used to obtain the room temperature 
diffusion coefficient of the vacancies, under different degrees of 
epitaxial strain.

In the second part of the talk I will discuss how in some cases 
theelectric field generated by the AFM-tip can be used to induce a local 
crystallographic transition between two states with different 
functionalities. In this case, oxygen vacancies accumulated by the 
electric field reorganize spontaneously to form a different crystal 
structure through a topotactic transformation, defining a new functional 
state with extra stability against diffusion. I will discuss the cases 
of SrFeO3-d and LaSrMnO3-d.



Saludos
Raúl

-- 




Raúl Mendoza Jiménez
Técnico de Apoyo a la Investigación INA
c/Mariano Esquillor s/n. (50018) zaragoza.
edificio i+d+i. Campus Rio Ebro. Universidad de Zaragoza
INA - Instituto de Nanociencia de Aragón
tel: +34 976 762865. fax: +34 976 762776
web: http://ina.unizar.es
e-mail: rmendoza en unizar.es


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