Structural and Magnetic Phase Transitions near Optimal Superconductivity in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><msub><mrow><mi>BaFe</mi></mrow><mrow><mn>2</mn></mrow></msub><mo stretchy="false">(</mo><msub><mrow><mi>As</mi></mrow><mrow><mn>1</mn><mo>−</mo><mi>x</mi></mrow></msub><msub><mrow><mi mathvariant="normal">P</mi></mrow><mrow><mi>x</mi></mrow></msub><mo stretchy="false">)</mo></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span>

Ding Hu; Xingye Lu; Wenliang Zhang; Huiqian Luo; Shiliang Li; Peipei Wang; Genfu Chen; Fei Han; Shree R. Banjara; A. Sapkota; A. Kreyssig; A. I. Goldman; Z. Yamani; Christof Niedermayer; Markos Skoulatos; Robert Georgii; T. Keller; Pengshuai Wang; Weiqiang Yu; Pengcheng Dai

doi:10.1103/PhysRevLett.114.157002

Structural and Magnetic Phase Transitions near Optimal Superconductivity in ${{BaFe}_{2} ({As}_{1 - x} P_{x})}_{2}$

Ding Hu¹, Xingye Lu¹, Wenliang Zhang¹, Huiqian Luo¹, Shiliang Li^1,2, Peipei Wang¹, Genfu Chen^1,*, Fei Han³, Shree R. Banjara^4,5 et al.

A. Sapkota^4,5, A. Kreyssig^4,5, A. I. Goldman^4,5, Z. Yamani⁶, Christof Niedermayer⁷, Markos Skoulatos⁷, Robert Georgii⁸, T. Keller^9,10, Pengshuai Wang¹¹, Weiqiang Yu¹¹, and Pengcheng Dai^12,1,†

¹Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
²Collaborative Innovation Center of Quantum Matter, Beijing, China
³Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
⁴Ames Laboratory, U.S. DOE, Ames, Iowa 50011, USA
⁵Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
⁶Canadian Neutron Beam Centre, National Research Council, Chalk River, Ontario K0J 1P0, Canada
⁷Laboratory for Neutron Scattering, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
⁸Heinz Maier-Leibnitz Zentrum, Technische Universität München, D-85748 Garching, Germany
⁹Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
¹⁰Max Planck Society Outstation at the Forschungsneutronenquelle Heinz Maier-Leibnitz (MLZ), D-85747 Garching, Germany
¹¹Department of Physics, Renmin University of China, Beijing 100872, China
¹²Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA

^*gfchen@iphy.ac.cn
^†pdai@rice.edu

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Phys. Rev. Lett. 114, 157002 – Published 17 April, 2015

DOI: https://doi.org/10.1103/PhysRevLett.114.157002

Abstract

We use nuclear magnetic resonance (NMR), high-resolution x-ray, and neutron scattering studies to study structural and magnetic phase transitions in phosphorus-doped ${{BaFe}_{2} ({As}_{1 - x} P_{x})}_{2}$ . Previous transport, NMR, specific heat, and magnetic penetration depth measurements have provided compelling evidence for the presence of a quantum critical point (QCP) near optimal superconductivity at $x = 0.3$ . However, we show that the tetragonal-to-orthorhombic structural ( $T_{s}$ ) and paramagnetic to antiferromagnetic (AF, $T_{N}$ ) transitions in ${{BaFe}_{2} ({As}_{1 - x} P_{x})}_{2}$ are always coupled and approach $T_{N} \approx T_{s} \geq T_{c}$ ( $\approx 29 K$ ) for $x = 0.29$ before vanishing abruptly for $x \geq 0.3$ . These results suggest that AF order in ${{BaFe}_{2} ({As}_{1 - x} P_{x})}_{2}$ disappears in a weakly first-order fashion near optimal superconductivity, much like the electron-doped iron pnictides with an avoided QCP.

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Structural and Magnetic Phase Transitions near Optimal Superconductivity in ${{BaFe}_{2} ({As}_{1 - x} P_{x})}_{2}$

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Structural and Magnetic Phase Transitions near Optimal Superconductivity in BaFe2(As1−xPx)2

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Structural and Magnetic Phase Transitions near Optimal Superconductivity in ${{BaFe}_{2} ({As}_{1 - x} P_{x})}_{2}$