Full metadata record
DC Field | Value | Language |
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dc.contributor.author | Min, Byeong Hun | - |
dc.contributor.author | Hong, Jong Beom | - |
dc.contributor.author | Yun, Jae Hyun | - |
dc.contributor.author | Iizuka, Takuya | - |
dc.contributor.author | Kimura, Shin-ichi | - |
dc.contributor.author | Bang, Yunkyu | - |
dc.contributor.author | Kwon, Yong Seung | - |
dc.date.available | 2017-07-11T06:34:44Z | - |
dc.date.created | 2017-04-10 | - |
dc.date.issued | 2013-07 | - |
dc.identifier.issn | 1367-2630 | - |
dc.identifier.uri | http://hdl.handle.net/20.500.11750/3221 | - |
dc.description.abstract | We have measured the reflectivity spectra of the LiFeAs (Tc = 17.6 K) single crystal in the temperature range from 4 to 300 K. In the superconducting (SC) state (T < Tc), the clean opening of the optical absorption gap was observed below 25 cm-1, indicating an isotropic full gap formation. In the normal state (T > Tc), the optical conductivity spectra display typical metallic behavior with the Drude-type spectra at low frequencies, but we found that the introduction of the two Drude components best fits the data, indicating the multiband nature of this compound. A theoretical analysis of the low-temperature data (T = 4 K < Tc) also suggests that two SC gaps best fit the data and their values were estimated as Δ1 = 3.3 meV and Δ2 = 1.59 meV, respectively. Using the Ferrell-Glover-Tinkham sum rule and dielectric function 1 (ω), the plasma frequency of the SC condensate (ωps) is consistently estimated to be 6665 cm-1, implying that about 65% of the free carriers of the normal state condense into the SC condensate. To investigate the various interband transition processes (for ω > 200 cm-1), we have also performed the local-density approximation band calculation and calculated the optical spectra of the interband transitions. This theoretical result provided qualitative agreement with the experimental data below 4000 cm-1 . © IOP Publishing and Deutsche Physikalische Gesellschaft. | - |
dc.language | English | - |
dc.publisher | Institute of Physics Publishing | - |
dc.title | Optical properties of the iron-based superconductor LiFeAs single crystal | - |
dc.type | Article | - |
dc.identifier.doi | 10.1088/1367-2630/15/7/073029 | - |
dc.identifier.scopusid | 2-s2.0-84880428944 | - |
dc.identifier.bibliographicCitation | New Journal of Physics, v.15 | - |
dc.description.isOpenAccess | FALSE | - |
dc.citation.title | New Journal of Physics | - |
dc.citation.volume | 15 | - |
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