Naslov
Uniaxial Strain Control of Bulk Ferromagnetism in Rare-Earth Titanates

Autori
Najev, A. ; Hameed, S. ; Gautreau, D. ; Wang, Z. ; Joe, J. ; Požek, M. ; Birol, T. ; Fernandes, R. M. ; Greven, M. ; Pelc, D.

Izvornik
Physical Review Letters (0031-9007) 128 (2022), 16; 167201, 6

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
titanates ; uniaxial stress ; quantum critical point ; magnetization

Sažetak
The perovskite rare-earth titanates are model Mott insulators with magnetic ground states that are very sensitive to structural distortions. These distortions couple strongly to the orbital degrees of freedom and, in principle, it should be possible to tune the superexchange and the magnetic transition with strain. We investigate the representative system ðY ; La ; CaÞTiO3, which exhibits low crystallographic symmetry and no structural instabilities. From magnetic susceptibility measurements of the Curie temperature, we demonstrate direct, reversible, and continuous control of ferromagnetism by influencing the TiO6 octahedral tilts and rotations with uniaxial strain. The relative change in TC as a function of strain is well described by ab initio calculations, which provides detailed understanding of the complex interactions among structural, orbital, and magnetic properties in rare-earth titanates. The demonstrated manipulation of octahedral distortions opens up far-reaching possibilities for investigations of electron-lattice coupling, competing ground states, and magnetic quantum phase transitions in a wide range of quantum materials.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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