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Persistence of antiferromagnetic order upon La substitution in the 4d(4) Mott insulator Ca2RuO4

Pincini, D; Boseggia, S; Perry, R; Gutmann, MJ; Ricco, S; Veiga, LSI; Dashwood, CD; ... McMorrow, DF; + view all (2018) Persistence of antiferromagnetic order upon La substitution in the 4d(4) Mott insulator Ca2RuO4. Physical Review B , 98 (1) , Article 014429. 10.1103/PhysRevB.98.014429. Green open access

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Abstract

The chemical and magnetic structures of the series of compounds Ca 2 − x La x RuO 4 [ x = 0 , 0.05(1), 0.07(1), 0.12(1)] have been investigated using neutron diffraction and resonant elastic x-ray scattering. Upon La doping, the low-temperature S- P b c a space group of the parent compound is retained in all insulating samples [ x ≤ 0.07 ( 1 ) ] , but with significant changes to the atomic positions within the unit cell. These changes can be characterized in terms of the local RuO 6 octahedral coordination: with increasing doping, the structure, crudely speaking, evolves from an orthorhombic unit cell with compressed octahedra to a quasitetragonal unit cell with elongated ones. The magnetic structure on the other hand, is found to be robust, with the basic k = ( 0 , 0 , 0 ) , b -axis antiferromagnetic order of the parent compound preserved below the critical La doping concentration of x ≈ 0.11 . The only effects of La doping on the magnetic structure are to suppress the A-centred mode, favoring the B mode instead, and to reduce the Néel temperature somewhat. Our results are discussed with reference to previous experimental reports on the effects of cation substitution on the d 4 Mott insulator Ca 2 RuO 4 , as well as with regard to theoretical studies on the evolution of its electronic and magnetic structure. In particular, our results rule out the presence of a proposed ferromagnetic phase, and suggest that the structural effects associated with La substitution play an important role in the physics of the system.

Type: Article
Title: Persistence of antiferromagnetic order upon La substitution in the 4d(4) Mott insulator Ca2RuO4
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.98.014429
Publisher version: https://doi.org/10.1103/PhysRevB.98.014429
Language: English
Additional information: This is the published version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: https://discovery.ucl.ac.uk/id/eprint/10055353
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