Strong local moment antiferromagnetic spin fluctuations in V-doped LiFeAs

Zhuang Xu; Guangyang Dai; Yu Li; Zhiping Yin; Yan Rong; Long Tian; Panpan Liu; Hui Wang; Lingyi Xing; Yuan Wei; Ryoichi Kajimoto; Kazuhiko Ikeuchi; D. L. Abernathy; Xiancheng Wang; Changqing Jin; Xingye Lu; Guotai Tan; Pengcheng Dai

doi:10.1038/s41535-020-0212-x

Strong local moment antiferromagnetic spin fluctuations in V-doped LiFeAs

Zhuang Xu, Guangyang Dai, Yu Li, Zhiping Yin, Yan Rong, Long Tian, Panpan Liu, Hui Wang, Lingyi Xing, Yuan Wei, Ryoichi Kajimoto, Kazuhiko Ikeuchi, D. L. Abernathy, Xiancheng Wang, Changqing Jin, Xingye Lu, Guotai Tan, Pengcheng Dai

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Abstract

We use neutron scattering to study Vanadium (hole)-doped LiFe_1−xV_xAs. In the undoped state, LiFeAs exhibits superconductivity at T_c = 18 K and transverse incommensurate spin excitations similar to electron overdoped iron pnictides. Upon Vanadium doping to form LiFe_0.955V_0.045, the transverse incommensurate spin excitations in LiFeAs transform into longitudinally elongated ones in a similar fashion to that of potassium (hole)-doped Ba_0.7K_0.3Fe₂As₂ but with dramatically enhanced magnetic scattering and elimination of superconductivity. This is different from the suppression of the overall magnetic excitations in hole-doped BaFe₂As₂ and the enhancement of superconductivity near optimal hole doping. These results are consistent with density function theory plus dynamic mean field theory calculations, suggesting that Vanadium doping in LiFeAs may induce an enlarged effective magnetic moment S_eff with a spin crossover ground state arising from the inter-orbital scattering of itinerant electrons.

Original language	English
Article number	11
Journal	npj Quantum Materials
Volume	5
Issue number	1
DOIs	https://doi.org/10.1038/s41535-020-0212-x
State	Published - Dec 1 2020

Funding

11734002) (to X.L.). Z.Y. was supported by the NSFC (Grant No. 11674030), the Fundamental Research Funds for the Central Universities (Grant No. 310421113), and the National Key Research and Development Program of China grant 2016YFA0302300. The calculations used high-performance computing clusters at BNU in Zhuhai and the National Supercomputer Center in Guangzhou. The neutron-scattering work at Rice is supported by the U.S. DOE BES under contract no. DESC0012311 (to P.D.). The neutron experiment at the Materials and Life Science Experimental Facility of the J-PARC was performed under a user program 2017B0216. The neutron-scattering work at Beijing Normal University is supported by the Fundamental Research Funds for the Central Universities (Grant Nos. 310432101 and 2014JJCB27) and the National Natural Science Foundation of China (Grant No.

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title = "Strong local moment antiferromagnetic spin fluctuations in V-doped LiFeAs",

abstract = "We use neutron scattering to study Vanadium (hole)-doped LiFe1−xVxAs. In the undoped state, LiFeAs exhibits superconductivity at Tc = 18 K and transverse incommensurate spin excitations similar to electron overdoped iron pnictides. Upon Vanadium doping to form LiFe0.955V0.045, the transverse incommensurate spin excitations in LiFeAs transform into longitudinally elongated ones in a similar fashion to that of potassium (hole)-doped Ba0.7K0.3Fe2As2 but with dramatically enhanced magnetic scattering and elimination of superconductivity. This is different from the suppression of the overall magnetic excitations in hole-doped BaFe2As2 and the enhancement of superconductivity near optimal hole doping. These results are consistent with density function theory plus dynamic mean field theory calculations, suggesting that Vanadium doping in LiFeAs may induce an enlarged effective magnetic moment Seff with a spin crossover ground state arising from the inter-orbital scattering of itinerant electrons.",

author = "Zhuang Xu and Guangyang Dai and Yu Li and Zhiping Yin and Yan Rong and Long Tian and Panpan Liu and Hui Wang and Lingyi Xing and Yuan Wei and Ryoichi Kajimoto and Kazuhiko Ikeuchi and Abernathy, {D. L.} and Xiancheng Wang and Changqing Jin and Xingye Lu and Guotai Tan and Pengcheng Dai",

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T1 - Strong local moment antiferromagnetic spin fluctuations in V-doped LiFeAs

AU - Xu, Zhuang

AU - Dai, Guangyang

AU - Li, Yu

AU - Yin, Zhiping

AU - Rong, Yan

AU - Tian, Long

AU - Liu, Panpan

AU - Wang, Hui

AU - Xing, Lingyi

AU - Wei, Yuan

AU - Kajimoto, Ryoichi

AU - Ikeuchi, Kazuhiko

AU - Abernathy, D. L.

AU - Wang, Xiancheng

AU - Jin, Changqing

AU - Lu, Xingye

AU - Tan, Guotai

AU - Dai, Pengcheng

PY - 2020/12/1

Y1 - 2020/12/1

N2 - We use neutron scattering to study Vanadium (hole)-doped LiFe1−xVxAs. In the undoped state, LiFeAs exhibits superconductivity at Tc = 18 K and transverse incommensurate spin excitations similar to electron overdoped iron pnictides. Upon Vanadium doping to form LiFe0.955V0.045, the transverse incommensurate spin excitations in LiFeAs transform into longitudinally elongated ones in a similar fashion to that of potassium (hole)-doped Ba0.7K0.3Fe2As2 but with dramatically enhanced magnetic scattering and elimination of superconductivity. This is different from the suppression of the overall magnetic excitations in hole-doped BaFe2As2 and the enhancement of superconductivity near optimal hole doping. These results are consistent with density function theory plus dynamic mean field theory calculations, suggesting that Vanadium doping in LiFeAs may induce an enlarged effective magnetic moment Seff with a spin crossover ground state arising from the inter-orbital scattering of itinerant electrons.

AB - We use neutron scattering to study Vanadium (hole)-doped LiFe1−xVxAs. In the undoped state, LiFeAs exhibits superconductivity at Tc = 18 K and transverse incommensurate spin excitations similar to electron overdoped iron pnictides. Upon Vanadium doping to form LiFe0.955V0.045, the transverse incommensurate spin excitations in LiFeAs transform into longitudinally elongated ones in a similar fashion to that of potassium (hole)-doped Ba0.7K0.3Fe2As2 but with dramatically enhanced magnetic scattering and elimination of superconductivity. This is different from the suppression of the overall magnetic excitations in hole-doped BaFe2As2 and the enhancement of superconductivity near optimal hole doping. These results are consistent with density function theory plus dynamic mean field theory calculations, suggesting that Vanadium doping in LiFeAs may induce an enlarged effective magnetic moment Seff with a spin crossover ground state arising from the inter-orbital scattering of itinerant electrons.

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Strong local moment antiferromagnetic spin fluctuations in V-doped LiFeAs

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