Saved in:
| Main Authors: | , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2503.06314 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866912511299682304 |
|---|---|
| author | Chang, Ming-Hua Backes, Steffen Lu, Donghui Gauthier, Nicolas Hashimoto, Makoto Chen, Guan-Yu Wen, Hai-Hu Mo, Sung-Kwan Shen, Zhi-Xun Valenti, Roser Pfau, Heike |
| author_facet | Chang, Ming-Hua Backes, Steffen Lu, Donghui Gauthier, Nicolas Hashimoto, Makoto Chen, Guan-Yu Wen, Hai-Hu Mo, Sung-Kwan Shen, Zhi-Xun Valenti, Roser Pfau, Heike |
| contents | Understanding how renormalized quasiparticles emerge in strongly correlated electron materials provides a challenge for both experiment and theory. It has been predicted that distinctive spin and orbital screening mechanisms drive this process in multiorbital materials with strong Coulomb and Hund's interactions. Here, we provide the experimental evidence of both mechanisms from angle-resolved photoemission spectroscopy on RbFe$_2$As$_2$. We observe that the emergence of low-energy Fe 3$d_{xy}$ quasiparticles below 90K is tied to spin screening. A second process changes the spectral weight at high energies up to room temperature. Supported by theoretical calculations we attribute it to orbital screening of Fe 3d atomic excitations. These two cascading screening processes drive the temperature evolution from a bad metal to a correlated Fermi liquid. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_06314 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Observation of Two Cascading Screening Processes in an Iron-based Superconductor Chang, Ming-Hua Backes, Steffen Lu, Donghui Gauthier, Nicolas Hashimoto, Makoto Chen, Guan-Yu Wen, Hai-Hu Mo, Sung-Kwan Shen, Zhi-Xun Valenti, Roser Pfau, Heike Strongly Correlated Electrons Understanding how renormalized quasiparticles emerge in strongly correlated electron materials provides a challenge for both experiment and theory. It has been predicted that distinctive spin and orbital screening mechanisms drive this process in multiorbital materials with strong Coulomb and Hund's interactions. Here, we provide the experimental evidence of both mechanisms from angle-resolved photoemission spectroscopy on RbFe$_2$As$_2$. We observe that the emergence of low-energy Fe 3$d_{xy}$ quasiparticles below 90K is tied to spin screening. A second process changes the spectral weight at high energies up to room temperature. Supported by theoretical calculations we attribute it to orbital screening of Fe 3d atomic excitations. These two cascading screening processes drive the temperature evolution from a bad metal to a correlated Fermi liquid. |
| title | Observation of Two Cascading Screening Processes in an Iron-based Superconductor |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2503.06314 |