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Antiferromagnetic Order and Phase Coexistence in Antisite Disordered Double Perovskites
Strongly Correlated Electrons · Submitted 9 Sep 2010
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We discover that A and G type AF order, that is predicted in the clean limit, is actually suppressed less strongly than ferromagnetism by antisite disorder.
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The abstract, sentence by sentence
In addition to the well known ferromagnetism, double perovskites are also expected to exhibit antiferromagnetic (AF) order driven by electron delocalisation. This has been seen in model Hamiltonian studies and confirmed via ab initio calculations. The AF phases should occur, for example, on sufficient electron doping of materials like Sr_2FeMoO_6 (SFMO) via La substitution for Sr. Clear experimental indication of such AF order is limited, possibly because of increase in antisite disorder with La doping on SFMO, although intriguing signatures of non ferromagnetic behaviour are seen. We study the survival of electronically driven antiferromagnetism in the presence of spatially correlated antisite disorder and extract the signals in magnetism and transport. We discover that A and G type AF order, that is predicted in the clean limit, is actually suppressed less strongly than ferromagnetism by antisite disorder. The AF phases are metallic, and, remarkably, more conducting that the ferromagnet for similar antisite disorder. We also highlight the phase coexistence window that connects the ferromagnetic regime to the A type antiferromagnetic phase.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | In addition to the well known ferromagnetism, double perovskites are also expected to exhibit antiferromagnetic (AF) order driven by electron delocalisation. | background 1.00 | 0.04 | 0.03 | hedged possibility 0.85 |
| s1 | This has been seen in model Hamiltonian studies and confirmed via ab initio calculations. | background 1.00 | 0.06 | 0.02 | asserted 1.00 |
| s2 | The AF phases should occur, for example, on sufficient electron doping of materials like Sr_2FeMoO_6 (SFMO) via La substitution for Sr. | background 1.00 | 0.06 | 0.03 | hedged possibility 0.57 |
| s3 | Clear experimental indication of such AF order is limited, possibly because of increase in antisite disorder with La doping on SFMO, although intriguing signatures of non ferromagnetic behaviour are seen. | gap 0.83 | 0.10 | 0.03 | hedged possibility 0.95 |
| s4 | We study the survival of electronically driven antiferromagnetism in the presence of spatially correlated antisite disorder and extract the signals in magnetism and transport. | contribution 1.00 | 0.90 | 0.07 | asserted 0.89 |
| s5 | We discover that A and G type AF order, that is predicted in the clean limit, is actually suppressed less strongly than ferromagnetism by antisite disorder. | result 1.00 | 0.95 | 0.66 | asserted 1.00 |
| s6 | The AF phases are metallic, and, remarkably, more conducting that the ferromagnet for similar antisite disorder. | result 1.00 | 0.91 | 0.21 | asserted 1.00 |
| s7 | We also highlight the phase coexistence window that connects the ferromagnetic regime to the A type antiferromagnetic phase. | result 0.98 | 0.87 | 0.14 | asserted 0.99 |
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Original abstract
In addition to the well known ferromagnetism, double perovskites are also expected to exhibit antiferromagnetic (AF) order driven by electron delocalisation. This has been seen in model Hamiltonian studies and confirmed via ab initio calculations. The AF phases should occur, for example, on sufficient electron doping of materials like Sr_2FeMoO_6 (SFMO) via La substitution for Sr. Clear experimental indication of such AF order is limited, possibly because of increase in antisite disorder with La doping on SFMO, although intriguing signatures of non ferromagnetic behaviour are seen. We study the survival of electronically driven antiferromagnetism in the presence of spatially correlated antisite disorder and extract the signals in magnetism and transport. We discover that A and G type AF order, that is predicted in the clean limit, is actually suppressed less strongly than ferromagnetism by antisite disorder. The AF phases are metallic, and, remarkably, more conducting that the ferromagnet for similar antisite disorder. We also highlight the phase coexistence window that connects the ferromagnetic regime to the A type antiferromagnetic phase.
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