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首页> 外文期刊>Physical review >Pairing symmetry of the multiorbital pnictide superconductor BaFe_(1.84)Co_(0.16)As_2from Raman scattering
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Pairing symmetry of the multiorbital pnictide superconductor BaFe_(1.84)Co_(0.16)As_2from Raman scattering

机译：来自拉曼散射的多轨道肽超导体BaFe_（1.84）Co_（0.16）As_2的配对对称性

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摘要

The pairing symmetry of BaFe_(2_x)Ca_xAs_2 was investigated by Raman scattering. The gap structure appears only in the B_(2g) symmetry inconsistent with Muschler et al. [Phys. Rev. B 80, 180510(R) (2009)]. They concluded that the gap symmetry is the extended s with the argument that the B_(2g) spectra probe the electron pocket. Our calculation using the realistic band parameter, however, shows that the B_(2g) spectra are derived from mainly the hole pocket. The calculated intensity is much stronger in A_(1g) than in B_(2g) but the observed A_(1g) spectra have no gap structure. This inconsistency is removed, if the orbital combination is introduced in the pairing symmetry. That is, the symmetry of orbital combination is B_(2g) and that of momentum space is A_(1g). The energy of the gap peak is smaller than the gap energy of the hole pocket, indicating the observed peak is the resonant peak created in the gap of the s± superconductor.
机译：通过拉曼散射研究了BaFe_（2_x）Ca_xAs_2的配对对称性。间隙结构仅以与Muschler等人不一致的B_（2g）对称性出现。 [物理B 80，180510（R）（2009）。他们得出的结论是，间隙对称性是s的扩展，并且认为B_（2g）光谱探测了电子腔。然而，我们使用实际带参数进行的计算表明，B_（2g）光谱主要来自空穴。 A_（1g）中的计算强度比B_（2g）中的强度大得多，但观察到的A_（1g）光谱没有间隙结构。如果将轨道组合引入配对对称性，则可以消除这种不一致。即，轨道组合的对称性为B_（2g），动量空间的对称性为A_（1g）。间隙峰的能量小于空穴的间隙能量，表明观察到的峰是在s±超导体的间隙中产生的共振峰。

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  • 来源
    《Physical review》 |2010年第14期|p.140504.1-140504.4|共4页
  • 作者

    S.Sugai; Y.Mizuno; K.Kino; M.Nakajima; C.H.Lee; A.Iyo; H.Eisaki; S.Uchida;

  • 作者单位

    Department of Physics, Faculty of Science, Nagoya University, fuero-cho, Chikusa-ku, Nagoya 464-8602, Japan,Venture Business Laboratory, Nagoya University, fuero-cho, Chikusa-ku, Nagoya 464-8601, Japan,TRIP, Japan Science and Technology Agency (JST), Chiyoda, Tokyo 102-0075, Japan;

    Department of Physics, Faculty of Science, Nagoya University, fuero-cho, Chikusa-ku, Nagoya 464-8602, Japan,TRIP, Japan Science and Technology Agency (JST), Chiyoda, Tokyo 102-0075, Japan;

    TRIP, Japan Science and Technology Agency (JST), Chiyoda, Tokyo 102-0075, Japan,National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan;

    TRIP, Japan Science and Technology Agency (JST), Chiyoda, Tokyo 102-0075, Japan,Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan;

    TRIP, Japan Science and Technology Agency (JST), Chiyoda, Tokyo 102-0075, Japan,National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan;

    TRIP, Japan Science and Technology Agency (JST), Chiyoda, Tokyo 102-0075, Japan,National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan;

    TRIP, Japan Science and Technology Agency (JST), Chiyoda, Tokyo 102-0075, Japan,National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan;

    TRIP, Japan Science and Technology Agency (JST), Chiyoda, Tokyo 102-0075, Japan,Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan;

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  • 正文语种 eng
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  • 关键词

    pairing symmetries (other than s-wave); magnetic properties;

    机译：配对对称性（s波除外）;磁性;

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