Magnetism and transport in transparent high-mobility BaSnO3 films doped with La, Pr, Nd, and Gd
| Autor: | Emily Lindgren, Bharat Jalan, David W. Johnson, Elke Arenholz, Abhinav Prakash, Alexander W. Robertson, Alpha T. N'Diaye, Greg Haugstad, Yuri Suzuki, Franklin J. Wong, Nigel D. Browning, Urusa S. Alaan, Jeffrey Ditto, Padraic Shafer |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Ionic radius Physics and Astronomy (miscellaneous) Dopant Magnetism Doping 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Crystallographic defect Pulsed laser deposition Paramagnetism Crystallography 0103 physical sciences General Materials Science Grain boundary 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review Materials, vol 3, iss 12 PHYSICAL REVIEW MATERIALS |
| Popis: | We have explored the effect of magnetic rare-earth dopants substitutionally incorporated on the Ba sites of ${\mathrm{BaSnO}}_{3}$ in terms of electronic transport, magnetism, and optical properties. We show that for ${\mathrm{Ba}}_{0.92}{R}_{0.08}{\mathrm{SnO}}_{3}$ thin films (where $R=\text{La,}\phantom{\rule{4.pt}{0ex}}\text{Pr,}\phantom{\rule{4.pt}{0ex}}\text{Nd,}\phantom{\rule{4.pt}{0ex}}\text{Gd}$), there is a linear increase of mobility with carrier concentration across all doping schemes. La-doped films have the highest mobilities, followed by Pr- and Nd-doped films. Gd-doped samples have the largest ionic size mismatch with the Ba site and correspondingly the lowest carrier concentrations and electron mobilities. However, crystallinity does not appear to be a strong predictor of transport phenomena; our results suggest that point defects more than grain boundaries are key ingredients in tuning the conduction of ${\mathrm{BaSnO}}_{3}$ films grown by pulsed laser deposition. Pronounced, nonhysteretic x-ray magnetic dichroism signals are observed for Pr-, Nd-, and Gd-doped samples, indicating paramagnetism. Finally, we probe the optical constants for each of the ${\mathrm{BaSnO}}_{3}$ doping schemes and note that there is little change in the transmittance across all samples. Together these results shed light on conduction mechanisms in ${\mathrm{BaSnO}}_{3}$ doped with rare-earth cations. |
| Databáze: | OpenAIRE |
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