Uniaxial $c$-axis pressure effects on underdoped BaFe$_2$(As$_{0.72}$P$_{0.28}$)$_2$ superconductor

Ding Hu; David W. Tam; Wenliang Zhang; Yuan Wei; Robert Georgii; Bjorn Pedersen; Alfonso Chacon Roldan; Pengcheng Dai

doi:10.1103/PhysRevB.101.020507

paper

Uniaxial $c$ -axis pressure effects on underdoped BaFe $_{2}$ (As $_{0.72}$ P $_{0.28}$ ) $_{2}$ superconductor

arXiv:2001.05812 · doi:10.1103/PhysRevB.101.020507

Abstract

The optimal superconductivity ( $T_{c} \approx 30$ K) in BaFe $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$ can be reached when the coupled antiferromagnetic (AF) order ( $T_{N}$ ) and orthorhombic lattice distortion ( $T_{s}$ ) are suppressed to zero temperature with increasing of P concentration or hydrostatic pressure. Here we use transport and neutron scattering to study the $c$ -axis pressure effects on electronic phases in underdoped BaFe $_{2}$ (As $_{0.72}$ P $_{0.28}$ ) $_{2}$ , which has $T_{N} = T_{s} \approx 40$ K and $T_{c} \approx$ 28 K at zero pressure. With increasing $c$ -axis pressure, $T_{N}$ and $T_{s}$ are slightly enhanced around $P_{c} \sim 20$ MPa. Upon further increasing pressure, AF order is gradually suppressed to zero, while $T_{c}$ is enhanced to 30 K. Our results reveal the importance of magnetoelastic couplings in BaFe $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$ , suggesting that the $c$ -axis pressure can be used as a tuning parameter to manipulate the electronic phases in iron pnictides.

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Uniaxial c-axis pressure effects on underdoped BaFe2​(As0.72​P0.28​)2​ superconductor

Abstract

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Uniaxial $c$ -axis pressure effects on underdoped BaFe $_{2}$ (As $_{0.72}$ P $_{0.28}$ ) $_{2}$ superconductor