Johnson, RD;
Khalyavin, DD;
Manuel, P;
Zhang, L;
Yamaura, K;
Belik, AA;
(2020)
Emergence of a Magnetostructural Dipolar Glass in the Quadruple Perovskite Dy₁₋δMn₇₊δO₁₂.
Physical Review Letters
, 125
(9)
, Article 097601. 10.1103/PhysRevLett.125.097601.
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Abstract
We show that a polar, pseudo-Jahn-Teller instability exists for the underbonded rare-earth A -site cations in the quadruple perovskite Dy 1 − δ Mn 7 + δ O 12 , which leads to the spontaneous formation of a dipolar glass. This observation alone expands the applicability of pseudo-Jahn-Teller physics in perovskite-derived materials, for which it is typically confined to B -site cations. We demonstrate that the dipolar glass order parameter is coupled to a ferrimagnetic order parameter via strain, leading to a first order magnetostructural phase transition that can be tuned by magnetic field. This phenomenology may emerge in a broad range of perovskite-derived materials in which A -site cation ordering and octahedral tilting are mutually tied to meet the criteria of structural stability.
| Type: | Article |
|---|---|
| Title: | Emergence of a Magnetostructural Dipolar Glass in the Quadruple Perovskite Dy₁₋δMn₇₊δO₁₂ |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.125.097601 |
| Publisher version: | https://doi.org/10.1103/PhysRevLett.125.097601 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Dielectric properties, Ferrimagnetism, First order phase transitions, Manganites, Multiferroics, Perovskite, Neutron diffraction |
| UCL classification: | UCL 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 |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10110955 |
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