Band-dependent Quasiparticle Dynamics in Single Crystals of the Ba[subscript 0.6]K[subscript 0.4]Fe[subscript 2]As[subscript 2] Superconductor Revealed by Pump-Probe Spectroscopy
We report on band-dependent quasiparticle dynamics in Ba[subscript 0.6]K[subscript 0.4]Fe[subscript 2]As[subscript 2](Tc=37 K) measured using ultrafast pump-probe spectroscopy. In the superconducting state, we observe two distinct relaxation processes: a fast component whose decay rate increases li...
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2011
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| Online Access: | http://hdl.handle.net/1721.1/60703 https://orcid.org/0000-0002-6394-4987 |
| _version_ | 1810988434255249408 |
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| author | Torchinsky, Darius Hosseinzadeh Chen, G. F. Luo, J. L. Wang, N. L. Gedik, Nuh |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Torchinsky, Darius Hosseinzadeh Chen, G. F. Luo, J. L. Wang, N. L. Gedik, Nuh |
| author_sort | Torchinsky, Darius Hosseinzadeh |
| collection | MIT |
| description | We report on band-dependent quasiparticle dynamics in Ba[subscript 0.6]K[subscript 0.4]Fe[subscript 2]As[subscript 2](Tc=37 K) measured using ultrafast pump-probe spectroscopy. In the superconducting state, we observe two distinct relaxation processes: a fast component whose decay rate increases linearly with excitation density and a slow component with an excitation density independent decay rate. We argue that these two components reflect the recombination of quasiparticles in the two hole bands through intraband and interband processes. We also find that the thermal recombination rate of quasiparticles increases quadratically with temperature. The temperature and excitation density dependence of the decays indicates fully gapped hole bands and nodal or very anisotropic electron bands. |
| first_indexed | 2024-09-23T12:05:57Z |
| format | Article |
| id | mit-1721.1/60703 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T12:05:57Z |
| publishDate | 2011 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/607032022-09-28T00:04:49Z Band-dependent Quasiparticle Dynamics in Single Crystals of the Ba[subscript 0.6]K[subscript 0.4]Fe[subscript 2]As[subscript 2] Superconductor Revealed by Pump-Probe Spectroscopy Torchinsky, Darius Hosseinzadeh Chen, G. F. Luo, J. L. Wang, N. L. Gedik, Nuh Massachusetts Institute of Technology. Department of Physics Gedik, Nuh Torchinsky, Darius Hosseinzadeh Gedik, Nuh We report on band-dependent quasiparticle dynamics in Ba[subscript 0.6]K[subscript 0.4]Fe[subscript 2]As[subscript 2](Tc=37 K) measured using ultrafast pump-probe spectroscopy. In the superconducting state, we observe two distinct relaxation processes: a fast component whose decay rate increases linearly with excitation density and a slow component with an excitation density independent decay rate. We argue that these two components reflect the recombination of quasiparticles in the two hole bands through intraband and interband processes. We also find that the thermal recombination rate of quasiparticles increases quadratically with temperature. The temperature and excitation density dependence of the decays indicates fully gapped hole bands and nodal or very anisotropic electron bands. United States. Dept. of Energy (Grant No. DE-FG02-08ER46521) National Natural Science Foundation of China (NSFC) China. Ministry of Science and Technology (project 973) 2011-01-25T16:26:48Z 2011-01-25T16:26:48Z 2010-07 2010-02 Article http://purl.org/eprint/type/JournalArticle 0031-9007 http://hdl.handle.net/1721.1/60703 Torchinsky, Darius H. et al. "." Physical Review Letters 105.2 (2010): 027005. © 2010 The American Physical Society https://orcid.org/0000-0002-6394-4987 en_US http://dx.doi.org/10.1103/PhysRevLett.105.027005 Physical Review Letters Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society APS |
| spellingShingle | Torchinsky, Darius Hosseinzadeh Chen, G. F. Luo, J. L. Wang, N. L. Gedik, Nuh Band-dependent Quasiparticle Dynamics in Single Crystals of the Ba[subscript 0.6]K[subscript 0.4]Fe[subscript 2]As[subscript 2] Superconductor Revealed by Pump-Probe Spectroscopy |
| title | Band-dependent Quasiparticle Dynamics in Single Crystals of the Ba[subscript 0.6]K[subscript 0.4]Fe[subscript 2]As[subscript 2] Superconductor Revealed by Pump-Probe Spectroscopy |
| title_full | Band-dependent Quasiparticle Dynamics in Single Crystals of the Ba[subscript 0.6]K[subscript 0.4]Fe[subscript 2]As[subscript 2] Superconductor Revealed by Pump-Probe Spectroscopy |
| title_fullStr | Band-dependent Quasiparticle Dynamics in Single Crystals of the Ba[subscript 0.6]K[subscript 0.4]Fe[subscript 2]As[subscript 2] Superconductor Revealed by Pump-Probe Spectroscopy |
| title_full_unstemmed | Band-dependent Quasiparticle Dynamics in Single Crystals of the Ba[subscript 0.6]K[subscript 0.4]Fe[subscript 2]As[subscript 2] Superconductor Revealed by Pump-Probe Spectroscopy |
| title_short | Band-dependent Quasiparticle Dynamics in Single Crystals of the Ba[subscript 0.6]K[subscript 0.4]Fe[subscript 2]As[subscript 2] Superconductor Revealed by Pump-Probe Spectroscopy |
| title_sort | band dependent quasiparticle dynamics in single crystals of the ba subscript 0 6 k subscript 0 4 fe subscript 2 as subscript 2 superconductor revealed by pump probe spectroscopy |
| url | http://hdl.handle.net/1721.1/60703 https://orcid.org/0000-0002-6394-4987 |
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