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Spin fluctuations in the 112-type iron-based superconductor Ca$$_{0.82}$$La$$_{0.18}$$Fe$$_{0.96}$$Ni$$_{0.04}$$As$$_{2}$$

112型鉄系超伝導体Ca$$_{0.82}$$La$$_{0.18}$$Fe$$_{0.96}$$Ni$$_{0.04}$$As$$_{2}$$におけるスピン揺らぎ

Xie, T.*; Liu, C.*; 梶本 亮一  ; 池内 和彦*; Li, S.*; Luo, H.*

Xie, T.*; Liu, C.*; Kajimoto, Ryoichi; Ikeuchi, Kazuhiko*; Li, S.*; Luo, H.*

We report time-of-flight inelastic neutron scattering (INS) investigations on the spin fluctuation spectrum in the 112-type iron-based superconductor (FeSC) Ca$$_{0.82}$$La$$_{0.18}$$Fe$$_{0.96}$$Ni$$_{0.04}$$As$$_{2}$$ (CaLa-112). In comparison to the 122-type FeSCs with a centrosymmetric tetragonal lattice structure (space group $$I4/mmm$$) at room temperature and an in-plane stripe-type antiferromagnetic (AF) order at low temperature, the 112 system has a noncentrosymmetric structure (space group $$P2_1$$) with additional zigzag arsenic chains between Ca/La layers and a magnetic ground state with similar wavevector $$mathbf{Q}_mathrm{AF}$$ but different orientations of ordered moments in the parent compounds. Our INS study clearly reveals that the in-plane dispersions and the bandwidth of spin excitations in the superconducting CaLa-112 closely resemble to those in 122 systems. While the total fluctuating moments $$langle m^2 rangle approx 4.6 pm 0.2$$ $$mu_B^2$$/Fe are larger than 122 system, the dynamic correlation lengths are similar ($$xi approx 10$$ ${AA}$). These results suggest that superconductivity in iron arsenides may have a common magnetic origin under similar magnetic exchange couplings with a dual nature from local moments and itinerant electrons, despite their different magnetic patterns and lattice symmetries.

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English

掲載資料名

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Journal of Physics; Condensed Matter

巻

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34

号

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47

ページ数

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p.474001_1 - 474001_8

発行年月

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2022/11

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論文URL

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https://doi.org/10.1088/1361-648X/ac9441

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使用施設

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J-PARC物質・生命科学実験施設  

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分野：Physics, Condensed Matter

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