Doping evolution of the Anti-Ferrodistotrtive transition in doped SrTiO3
SrTiO3 is fascinating solid due to its remarkable lattice and electronic properties. At low temperature it is a quantum paraelectric materials which become ferroelectric after a light Ca doping and even superconductor after an oxygen reduction. It also host an anti-ferrodistortive (AFD) structurale transition at 105K. Surprisingly the nature of the interplay between the ferroelectric and AFD transition is sill an open question. It is generally though that they compete, yet our preliminary neutron diffraction measurements in lightly Ca-doped SrTiO3 suggest instead a cooperative effect. Here we propose a systematic study of the AFD transition function of the Curie temperature in two ferroelectric compounds Sr_{1-x}Ca_{x}TiO_3 and SrTiO^{16}_ {1-x}O^{18}_x . These measurements will not only clarify the interplay between the two lattice instabilities but they will also provide crucial informations to compute the electronic band structures and therefore for the ongoing discussion of the doping dependence of the superconducting state of lightly doped SrTiO3.
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FAUQUE Benoit; Bourges; FERNANDEZ CANIZARES Francisco; LEMEE Marie Helene and C. W. Rischau. (2021). Doping evolution of the Anti-Ferrodistotrtive transition in doped SrTiO3. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-14-279
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