Johnson, RD;
Khalyavin, DD;
Manuel, P;
Belik, AA;
(2021)
Competing electronic instabilities in the quadruple perovskite manganite PbMn₇O₁₂.
Physical Review B
, 103
(13)
, Article 134115. 10.1103/PhysRevB.103.134115.
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Abstract
Structural behavior of PbMn_{7}O_{12} has been studied by high resolution synchrotron x-ray powder diffraction. This material belongs to a family of quadruple perovskite manganites that exhibit an incommensurate structural modulation associated with an orbital density wave. It has been found that the structural modulation in PbMn_{7}O_{12} onsets at 294 K with the incommensurate propagation vector ks=(0,0,∼2.08). At 110 K another structural transition takes place where the propagation vector suddenly drops down to a quasicommensurate value ks=(0,0,2.0060(6)). The quasicommensurate phase is stable in the temperature range of 40-110 K, and below 40 K the propagation vector jumps back to the incommensurate value ks=(0,0,∼2.06). Both low temperature structural transitions are strongly first order with large thermal hysteresis. The orbital density wave in the quasicommensurate phase has been found to be substantially suppressed in comparison with the incommensurate phases, which naturally explains unusual magnetic behavior recently reported for this perovskite. Analysis of the refined structural parameters revealed that that the presence of the quasicommensurate phase is likely to be associated with a competition between the Pb^{2+} lone electron pair and Mn^{3+} Jahn-Teller instabilities.
| Type: | Article |
|---|---|
| Title: | Competing electronic instabilities in the quadruple perovskite manganite PbMn₇O₁₂ |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevB.103.134115 |
| Publisher version: | https://doi.org/10.1103/PhysRevB.103.134115 |
| 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. |
| 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/10128271 |
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