Journal
PHYSICAL REVIEW B
Volume 82, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.214111
Keywords
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Funding
- FP7 NMP ENSEMBLE Project [GA NMP4-SL-2008-213669]
- Ministry of Science and Higher Education of Poland [N 5076 143 32/4056]
- Natural Environment Research Council of Great Britain [NE/B505738/1]
- NERC [NE/F017081/1] Funding Source: UKRI
- Natural Environment Research Council [NE/B505738/1, NE/F017081/1] Funding Source: researchfish
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Resonant ultrasound spectroscopy has been used on single-crystal samples to observe pseudoproper ferroelastic softening across the (La,Pr)AlO3 solid solution. It is suggested that softening is due to the presence of an intrinsic zone-center instability in addition to the small Jahn-Teller stabilization expected for Pr3+. Softening increases as smaller Pr3+ ions are substituted for larger La3+ which is attributed to a simple size effect as well as the possibility of bilinear coupling of the intrinsic instability with the weak Jahn-Teller effect. Superattenuation is observed above 600 K for all samples, which is consistent with twin wall related dissipation behavior seen in other perovskites with octahedral tilting. Superattenuation is also observed in the low-temperature monoclinic phase, implying a high mobility also for the monoclinic twin walls.
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