Experimental observation of incoherent-coherent crossover and orbital-dependent band renormalization in iron chalcogenide superconductors
Abstract
The level of electronic correlation has been one of the key questions in understanding the nature of superconductivity. Among the iron-based superconductors, the iron chalcogenide family exhibits the strongest electron correlations. To gauge the correlation strength, we performed a systematic angle-resolved photoemission spectroscopy study on the iron chalcogenide series Fe1+ySexTe1-x (0 < x < 0.59), a model system with the simplest structure. Our measurement reveals an incoherent-to-coherent crossover in the electronic structure as the selenium ratio increases and the system evolves from a weakly localized to a more itinerant state. Furthermore, we found that the effective mass of bands dominated by the dxy orbital character significantly decreases with increasing selenium ratio, as compared to the dxz/dyz orbital-dominated bands. The orbital-dependent change in the correlation level agrees with theoretical calculations on the band structure renormalization, and may help to understand the onset of superconductivity in Fe1+ySexTe1-x.
- Authors:
-
- SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Tulane Univ., New Orleans, LA (United States)
- Renmin Univ. of China, Beijing (China); Rice Univ., Houston, TX (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Boston College, Chestnut Hill, MA (United States)
- Univ. of Oxford (United Kingdom)
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Rice Univ., Houston, TX (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1393003
- Alternate Identifier(s):
- OSTI ID: 1234087
- Grant/Contract Number:
- AC02-05CH11231; AC02-76SF00515
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Physical Review. B, Condensed Matter and Materials Physics
- Additional Journal Information:
- Journal Volume: 92; Journal Issue: 23; Journal ID: ISSN 1098-0121
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Liu, Z. K., Yi, M., Zhang, Y., Hu, J., Yu, R., Zhu, J. -X., He, R. -H., Chen, Y. L., Hashimoto, M., Moore, R. G., Mo, S. -K., Hussain, Z., Si, Q., Mao, Z. Q., Lu, D. H., and Shen, Z. -X. Experimental observation of incoherent-coherent crossover and orbital-dependent band renormalization in iron chalcogenide superconductors. United States: N. p., 2015.
Web. doi:10.1103/PhysRevB.92.235138.
Liu, Z. K., Yi, M., Zhang, Y., Hu, J., Yu, R., Zhu, J. -X., He, R. -H., Chen, Y. L., Hashimoto, M., Moore, R. G., Mo, S. -K., Hussain, Z., Si, Q., Mao, Z. Q., Lu, D. H., & Shen, Z. -X. Experimental observation of incoherent-coherent crossover and orbital-dependent band renormalization in iron chalcogenide superconductors. United States. https://doi.org/10.1103/PhysRevB.92.235138
Liu, Z. K., Yi, M., Zhang, Y., Hu, J., Yu, R., Zhu, J. -X., He, R. -H., Chen, Y. L., Hashimoto, M., Moore, R. G., Mo, S. -K., Hussain, Z., Si, Q., Mao, Z. Q., Lu, D. H., and Shen, Z. -X. 2015.
"Experimental observation of incoherent-coherent crossover and orbital-dependent band renormalization in iron chalcogenide superconductors". United States. https://doi.org/10.1103/PhysRevB.92.235138. https://www.osti.gov/servlets/purl/1393003.
@article{osti_1393003,
title = {Experimental observation of incoherent-coherent crossover and orbital-dependent band renormalization in iron chalcogenide superconductors},
author = {Liu, Z. K. and Yi, M. and Zhang, Y. and Hu, J. and Yu, R. and Zhu, J. -X. and He, R. -H. and Chen, Y. L. and Hashimoto, M. and Moore, R. G. and Mo, S. -K. and Hussain, Z. and Si, Q. and Mao, Z. Q. and Lu, D. H. and Shen, Z. -X.},
abstractNote = {The level of electronic correlation has been one of the key questions in understanding the nature of superconductivity. Among the iron-based superconductors, the iron chalcogenide family exhibits the strongest electron correlations. To gauge the correlation strength, we performed a systematic angle-resolved photoemission spectroscopy study on the iron chalcogenide series Fe1+ySexTe1-x (0 < x < 0.59), a model system with the simplest structure. Our measurement reveals an incoherent-to-coherent crossover in the electronic structure as the selenium ratio increases and the system evolves from a weakly localized to a more itinerant state. Furthermore, we found that the effective mass of bands dominated by the dxy orbital character significantly decreases with increasing selenium ratio, as compared to the dxz/dyz orbital-dominated bands. The orbital-dependent change in the correlation level agrees with theoretical calculations on the band structure renormalization, and may help to understand the onset of superconductivity in Fe1+ySexTe1-x.},
doi = {10.1103/PhysRevB.92.235138},
url = {https://www.osti.gov/biblio/1393003},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 23,
volume = 92,
place = {United States},
year = {Tue Dec 22 00:00:00 EST 2015},
month = {Tue Dec 22 00:00:00 EST 2015}
}
Web of Science
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