c-axis pressure-induced antiferromagnetic order in optimally P-doped BaFe2(As0.70P0.30)2superconductor

Ding Hu; Weiyi Wang; Wenliang Zhang; Yuan Wei; Dongliang Gong; David W. Tam; Panpan Zhou; Yu Li; Guotai Tan; Yu Song; Robert Georgii; Björn Pedersen; Huibo Cao; Wei Tian; Bertrand Roessli; Zhiping Yin; Pengcheng Dai

doi:10.1038/s41535-018-0122-3

c-axis pressure-induced antiferromagnetic order in optimally P-doped BaFe₂(As_0.70P_0.30)₂superconductor

Ding Hu, Weiyi Wang, Wenliang Zhang, Yuan Wei, Dongliang Gong, David W. Tam, Panpan Zhou, Yu Li, Guotai Tan, Yu Song, Robert Georgii, Björn Pedersen, Huibo Cao, Wei Tian, Bertrand Roessli, Zhiping Yin, Pengcheng Dai

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Abstract

Superconductivity in BaFe₂(As_1−xP_x)₂iron pnictides emerges when its in-plane two-dimensional (2D) orthorhombic lattice distortion associated with nematic phase at T_sand three-dimensional (3D) collinear antiferromagnetic order at T_N(T_s= T_N) are gradually suppressed with increasing x, reaching optimal superconductivity around x = 0.30 with T_c≈ 30 K. Here we show that a moderate uniaxial pressure along the c-axis in BaFe₂(As_0.70P_0.30)₂spontaneously induces a 3D collinear antiferromagnetic order with T_N= T_s> 30 K, while only slightly suppresses T_c. Although a ~ 400 MPa pressure compresses the c-axis lattice while expanding the in-plane lattice and increasing the nearest-neighbor Fe–Fe distance, it barely changes the average iron-pnictogen height in BaFe₂(As_0.70P_0.30)₂. Therefore, the pressure-induced antiferromagnetic order must arise from a strong in-plane magnetoelastic coupling, suggesting that the 2D nematic phase is a competing state with superconductivity.

Original language	English
Article number	47
Journal	npj Quantum Materials
Volume	3
Issue number	1
DOIs	https://doi.org/10.1038/s41535-018-0122-3
State	Published - Dec 1 2018

Funding

The neutron scattering work at Rice is supported by the U.S. NSF-DMR-1700081 (P.D.). A part of the material synthesis work at Rice is supported by the Robert A. Welch Foundation Grant no. C-1839 (P.D.). 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 through Contract no. 2016YFA0302300. The calculations used high performance computing clusters at Beijing Normal University in Zhuhai and the National Supercomputer Center in Guangzhou. The work at IOP is supported by the “Strategic Priority Research Program (B)” of Chinese Academy of Sciences (XDB07020300), MOST (2012CB821400, 2011CBA00110,2015CB921302,2016YFA0300502), and NSFC (Nos. 11374011, 11374346, 91221303, 11421092, and 11574359). This research used resources at the High Flux Isotope Reactor, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.

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title = "c-axis pressure-induced antiferromagnetic order in optimally P-doped BaFe2(As0.70P0.30)2superconductor",

abstract = "Superconductivity in BaFe2(As1−xPx)2iron pnictides emerges when its in-plane two-dimensional (2D) orthorhombic lattice distortion associated with nematic phase at Tsand three-dimensional (3D) collinear antiferromagnetic order at TN(Ts= TN) are gradually suppressed with increasing x, reaching optimal superconductivity around x = 0.30 with Tc≈ 30 K. Here we show that a moderate uniaxial pressure along the c-axis in BaFe2(As0.70P0.30)2spontaneously induces a 3D collinear antiferromagnetic order with TN= Ts> 30 K, while only slightly suppresses Tc. Although a ~ 400 MPa pressure compresses the c-axis lattice while expanding the in-plane lattice and increasing the nearest-neighbor Fe–Fe distance, it barely changes the average iron-pnictogen height in BaFe2(As0.70P0.30)2. Therefore, the pressure-induced antiferromagnetic order must arise from a strong in-plane magnetoelastic coupling, suggesting that the 2D nematic phase is a competing state with superconductivity.",

author = "Ding Hu and Weiyi Wang and Wenliang Zhang and Yuan Wei and Dongliang Gong and Tam, {David W.} and Panpan Zhou and Yu Li and Guotai Tan and Yu Song and Robert Georgii and Bj{\"o}rn Pedersen and Huibo Cao and Wei Tian and Bertrand Roessli and Zhiping Yin and Pengcheng Dai",

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T1 - c-axis pressure-induced antiferromagnetic order in optimally P-doped BaFe2(As0.70P0.30)2superconductor

AU - Hu, Ding

AU - Wang, Weiyi

AU - Zhang, Wenliang

AU - Wei, Yuan

AU - Gong, Dongliang

AU - Tam, David W.

AU - Zhou, Panpan

AU - Li, Yu

AU - Tan, Guotai

AU - Song, Yu

AU - Georgii, Robert

AU - Pedersen, Björn

AU - Cao, Huibo

AU - Tian, Wei

AU - Roessli, Bertrand

AU - Yin, Zhiping

AU - Dai, Pengcheng

PY - 2018/12/1

Y1 - 2018/12/1

N2 - Superconductivity in BaFe2(As1−xPx)2iron pnictides emerges when its in-plane two-dimensional (2D) orthorhombic lattice distortion associated with nematic phase at Tsand three-dimensional (3D) collinear antiferromagnetic order at TN(Ts= TN) are gradually suppressed with increasing x, reaching optimal superconductivity around x = 0.30 with Tc≈ 30 K. Here we show that a moderate uniaxial pressure along the c-axis in BaFe2(As0.70P0.30)2spontaneously induces a 3D collinear antiferromagnetic order with TN= Ts> 30 K, while only slightly suppresses Tc. Although a ~ 400 MPa pressure compresses the c-axis lattice while expanding the in-plane lattice and increasing the nearest-neighbor Fe–Fe distance, it barely changes the average iron-pnictogen height in BaFe2(As0.70P0.30)2. Therefore, the pressure-induced antiferromagnetic order must arise from a strong in-plane magnetoelastic coupling, suggesting that the 2D nematic phase is a competing state with superconductivity.

AB - Superconductivity in BaFe2(As1−xPx)2iron pnictides emerges when its in-plane two-dimensional (2D) orthorhombic lattice distortion associated with nematic phase at Tsand three-dimensional (3D) collinear antiferromagnetic order at TN(Ts= TN) are gradually suppressed with increasing x, reaching optimal superconductivity around x = 0.30 with Tc≈ 30 K. Here we show that a moderate uniaxial pressure along the c-axis in BaFe2(As0.70P0.30)2spontaneously induces a 3D collinear antiferromagnetic order with TN= Ts> 30 K, while only slightly suppresses Tc. Although a ~ 400 MPa pressure compresses the c-axis lattice while expanding the in-plane lattice and increasing the nearest-neighbor Fe–Fe distance, it barely changes the average iron-pnictogen height in BaFe2(As0.70P0.30)2. Therefore, the pressure-induced antiferromagnetic order must arise from a strong in-plane magnetoelastic coupling, suggesting that the 2D nematic phase is a competing state with superconductivity.

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c-axis pressure-induced antiferromagnetic order in optimally P-doped BaFe₂(As_0.70P_0.30)₂superconductor

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