تقرير
Direct Observation of a Uniaxial Stress-driven Lifshitz Transition in Sr$_{2}$RuO$_{4}$
| العنوان: | Direct Observation of a Uniaxial Stress-driven Lifshitz Transition in Sr$_{2}$RuO$_{4}$ |
|---|---|
| المؤلفون: | Sunko, V., Morales, E. Abarca, Marković, I., Barber, M. E., Milosavljević, D., Mazzola, F., Sokolov, D. A., Kikugawa, N., Cacho, C., Dudin, P., Rosner, H., Hicks, C. W., King, P. D. C., Mackenzie, A. P. |
| المصدر: | npj Quantum Mater. 4, 46 (2019) |
| سنة النشر: | 2019 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Superconductivity |
| الوصف: | Pressure represents a clean tuning parameter for traversing the complex phase diagrams of interacting electron systems and as such has proved of key importance in the study of quantum materials. Application of controlled uniaxial pressure has recently been shown to more than double the transition temperature of the unconventional superconductor Sr$_{2}$RuO$_{4}$ for example, leading to a pronounced peak in $T_\mathrm{c}$ vs. strain whose origin is still under active debate. Here, we develop a simple and compact method to apply large uniaxial pressures passively in restricted sample environments, and utilize this to study the evolution of the electronic structure of Sr$_{2}$RuO$_{4}$ using angle-resolved photoemission. We directly visualize how uniaxial stress drives a Lifshitz transition of the $\gamma$-band Fermi surface, pointing to the key role of strain-tuning its associated van Hove singularity to the Fermi level in mediating the peak in $T_\mathrm{c}$. Our measurements provide stringent constraints for theoretical models of the strain-tuned electronic structure evolution of Sr$_{2}$RuO$_{4}$. More generally, our novel experimental approach opens the door to future studies of strain-tuned phase transitions not only using photoemission, but also other experimental techniques where large pressure cells or piezoelectric-based devices may be difficult to implement. |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1038/s41535-019-0185-9 |
| URL الوصول: | http://arxiv.org/abs/1903.09581 |
| رقم الأكسشن: | edsarx.1903.09581 |
| قاعدة البيانات: | arXiv |
كن أول من يترك تعليقا!