Jahn-Teller Distortion-Driven Lattice Parameter Tunability in Coherent High-Entropy Oxide Thin Films
Abstract
Here, we isolate how Cu concentration and Jahn-Teller distortions control the out-of-plane lattice parameter of pseudomorphic MgCoNiCuZnO-derived high-entropy oxide films on MgO. We prepare nine compositions spanning 0-20% Cu, verify target composition and phase by X-ray fluorescence and diffraction, and grow films by pulsed laser deposition across multiple substrate temperatures. At 500 °C, the lattice parameter increases nearly linearly with Cu content; at 300°C, it decreases nonlinearly, producing a 2.6% difference between temperature regimes for equimolar MgCoNiCuZnO at our growth conditions. We attribute this change in lattice parameter to temperature-dependent coupling between Cu-driven Jahn-Teller distortions and Co valence change. While prior work identifies Co valence as the primary driver of the MgCoNiCuZnO lattice response with temperature; our results establish Cu Jahn-Teller distortion as an equally important structural control parameter.
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BibTeX
@misc{srikanth2026jahnteller,
title = {{Jahn-Teller Distortion-Driven Lattice Parameter Tunability in Coherent High-Entropy Oxide Thin Films}},
author = {Dhiya Srikanth and Joseph Petruska and Matthew Furst and Kaylin Lamaute and Jon-Paul Maria and Saeed S. I. Almishal},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2609.31899},
eprint = {2609.31899},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.31899},
note = {CC BY-SA 4.0},
}
RIS
TY - UNPB
TI - Jahn-Teller Distortion-Driven Lattice Parameter Tunability in Coherent High-Entropy Oxide Thin Films
AU - Dhiya Srikanth
AU - Joseph Petruska
AU - Matthew Furst
AU - Kaylin Lamaute
AU - Jon-Paul Maria
AU - Saeed S. I. Almishal
PY - 2026
DA - 2026/10/06
PB - arXiv
DO - 10.48550/arxiv.2609.31899
UR - https://arxiv.org/abs/2609.31899
AB - Here, we isolate how Cu concentration and Jahn-Teller distortions control the out-of-plane lattice parameter of pseudomorphic MgCoNiCuZnO-derived high-entropy oxide films on MgO. We prepare nine compositions spanning 0-20% Cu, verify target composition and phase by X-ray fluorescence and diffraction, and grow films by pulsed laser deposition across multiple substrate temperatures. At 500 °C, the lattice parameter increases nearly linearly with Cu content; at 300°C, it decreases nonlinearly, producing a 2.6% difference between temperature regimes for equimolar MgCoNiCuZnO at our growth conditions. We attribute this change in lattice parameter to temperature-dependent coupling between Cu-driven Jahn-Teller distortions and Co valence change. While prior work identifies Co valence as the primary driver of the MgCoNiCuZnO lattice response with temperature; our results establish Cu Jahn-Teller distortion as an equally important structural control parameter.
ER -