Volume 127, Number 2, July 2019
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||02 September 2019|
Magnetism and anomalous apparently inverse Jahn-Teller effect in Sr2CrO4
1 Université Grenoble Alpes, CNRS, Grenoble INP, Institut Néel - F-38000, Grenoble, France
2 Institut Laue-Langevin - 71 Avenue des Martyrs, F-38000, Grenoble cedex 9, France
3 Gerencia de Investigación y Aplicaciones, Comisión Nacional de Energía Atómica (CNEA) and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) - Avda General Paz y Constituyentes, 1650 San Martín, Argentina
4 Instituto de Tecnología Sabato, Universidad Nacional de San Martín - CNEA - 1650 San Martín, Argentina
Received: 17 January 2019
Accepted: 15 July 2019
We have performed neutron diffraction measurements of tetragonal Sr2CrO4 to study the crystallographic structure as a function of temperature and the magnetic properties developed below . We have measured the precise positions of the oxygen atoms of the CrO6 octahedra and observed that, with decreasing temperature, the octahedra pass from elongated to almost ideal, contradicting the intuitive idea of a Jahn-Teller effect. DFT calculations explain this apparent anomalous behaviour by establishing that energy level degeneracy only exists in a highly elongated octahedra. Our study agrees with the idea of a weak orbital ordering transition around 150 K followed by an itinerant antiferromagnetic ordering at 110 K with a wave vector determined both from neutron powder diffraction and theory.
PACS: 75.50.-y – Studies of specific magnetic materials / 71.20.-b – Electron density of states and band structure of crystalline solids
© EPLA, 2019
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