Observation of pseudogaplike feature above Tc in LiFeAs by ultrafast optical spectroscopy

Kung Hsuan Lin; Kuan Jen Wang; Chung Chieh Chang; Yu Chieh Wen; Dzung Han Tsai; Yu Ruei Wu; Yao Tsung Hsieh; Ming Jye Wang; Bing Lv; Paul Ching Wu Chu; Maw Kuen Wu

doi:10.1103/PhysRevB.90.174502

Observation of pseudogaplike feature above Tc in LiFeAs by ultrafast optical spectroscopy

Kung Hsuan Lin, Kuan Jen Wang, Chung Chieh Chang, Yu Chieh Wen, Dzung Han Tsai, Yu Ruei Wu, Yao Tsung Hsieh, Ming Jye Wang, Bing Lv, Paul Ching Wu Chu, Maw Kuen Wu

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Abstract

We utilize ultrafast optical spectroscopy to study the quasiparticle relaxation in stoichiometric LiFeAs crystals. According to our temperature-dependent studies, we have observed three electronic phases in LiFeAs. Below the superconducting (SC) temperature Tc (=15 K), the relaxation time of quasiparticles due to the SC gaps is far longer than 50 ps in our experimental conditions. In addition to SC gaps, we have also found a gaplike feature in the SC state. This gaplike feature is evident up to 40 K, which is above the SC temperature. The quasiparticle relaxation time due to this gaplike feature is in the range of 1-2 ps. We suggest the gaplike feature in LiFeAs is induced by magnetic fluctuations.

Original language	English
Article number	174502
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	90
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevB.90.174502
Publication status	Published - 2014 Nov 7

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.90.174502

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title = "Observation of pseudogaplike feature above Tc in LiFeAs by ultrafast optical spectroscopy",

abstract = "We utilize ultrafast optical spectroscopy to study the quasiparticle relaxation in stoichiometric LiFeAs crystals. According to our temperature-dependent studies, we have observed three electronic phases in LiFeAs. Below the superconducting (SC) temperature Tc (=15 K), the relaxation time of quasiparticles due to the SC gaps is far longer than 50 ps in our experimental conditions. In addition to SC gaps, we have also found a gaplike feature in the SC state. This gaplike feature is evident up to 40 K, which is above the SC temperature. The quasiparticle relaxation time due to this gaplike feature is in the range of 1-2 ps. We suggest the gaplike feature in LiFeAs is induced by magnetic fluctuations.",

author = "Lin, {Kung Hsuan} and Wang, {Kuan Jen} and Chang, {Chung Chieh} and Wen, {Yu Chieh} and Tsai, {Dzung Han} and Wu, {Yu Ruei} and Hsieh, {Yao Tsung} and Wang, {Ming Jye} and Bing Lv and Chu, {Paul Ching Wu} and Wu, {Maw Kuen}",

year = "2014",

month = nov,

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doi = "10.1103/PhysRevB.90.174502",

language = "English",

volume = "90",

journal = "Physical Review B-Condensed Matter",

issn = "1098-0121",

publisher = "American Physical Society",

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T1 - Observation of pseudogaplike feature above Tc in LiFeAs by ultrafast optical spectroscopy

AU - Lin, Kung Hsuan

AU - Wang, Kuan Jen

AU - Chang, Chung Chieh

AU - Wen, Yu Chieh

AU - Tsai, Dzung Han

AU - Wu, Yu Ruei

AU - Hsieh, Yao Tsung

AU - Wang, Ming Jye

AU - Lv, Bing

AU - Chu, Paul Ching Wu

AU - Wu, Maw Kuen

PY - 2014/11/7

Y1 - 2014/11/7

N2 - We utilize ultrafast optical spectroscopy to study the quasiparticle relaxation in stoichiometric LiFeAs crystals. According to our temperature-dependent studies, we have observed three electronic phases in LiFeAs. Below the superconducting (SC) temperature Tc (=15 K), the relaxation time of quasiparticles due to the SC gaps is far longer than 50 ps in our experimental conditions. In addition to SC gaps, we have also found a gaplike feature in the SC state. This gaplike feature is evident up to 40 K, which is above the SC temperature. The quasiparticle relaxation time due to this gaplike feature is in the range of 1-2 ps. We suggest the gaplike feature in LiFeAs is induced by magnetic fluctuations.

AB - We utilize ultrafast optical spectroscopy to study the quasiparticle relaxation in stoichiometric LiFeAs crystals. According to our temperature-dependent studies, we have observed three electronic phases in LiFeAs. Below the superconducting (SC) temperature Tc (=15 K), the relaxation time of quasiparticles due to the SC gaps is far longer than 50 ps in our experimental conditions. In addition to SC gaps, we have also found a gaplike feature in the SC state. This gaplike feature is evident up to 40 K, which is above the SC temperature. The quasiparticle relaxation time due to this gaplike feature is in the range of 1-2 ps. We suggest the gaplike feature in LiFeAs is induced by magnetic fluctuations.

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SN - 1098-0121

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Observation of pseudogaplike feature above Tc in LiFeAs by ultrafast optical spectroscopy

Abstract

All Science Journal Classification (ASJC) codes

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