Impact of uniaxial pressure on structural and magnetic phase transitions in electron-doped iron pnictides

Xingye Lu, Kuo-Feng Tseng, T. Keller, Wenliang Zhang, Ding Hu, Yu Song, Haoran Man, J. T. Park, Huiqian Luo, Shiliang Li, Andriy H. Nevidomskyy, and Pengcheng Dai
Phys. Rev. B 93, 134519 – Published 28 April 2016

Abstract

We use neutron resonance spin echo and Larmor diffraction to study the effect of uniaxial pressure on the tetragonal-to-orthorhombic structural (Ts) and antiferromagnetic (AF) phase transitions in iron pnictides BaFe2xNixAs2 (x=0,0.03,0.12),SrFe1.97Ni0.03As2, and BaFe2(As0.7P0.3)2. In antiferromagnetically ordered BaFe2xNixAs2 and SrFe1.97Ni0.03As2 with TN and Ts (TNTs), a uniaxial pressure necessary to detwin the sample also increases TN, smears out the structural transition, and induces an orthorhombic lattice distortion at all temperatures. By comparing temperature and doping dependence of the pressure induced lattice parameter changes with the elastoresistance and nematic susceptibility obtained from transport and ultrasonic measurements, we conclude that the in-plane resistivity anisotropy found in the paramagnetic state of electron underdoped iron pnictides depends sensitively on the nature of the magnetic phase transition and a strong coupling between the uniaxial pressure induced lattice distortion and electronic nematic susceptibility.

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  • Received 15 July 2015
  • Revised 20 March 2016

DOI:https://doi.org/10.1103/PhysRevB.93.134519

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Xingye Lu1,2,*, Kuo-Feng Tseng3,4, T. Keller3,4, Wenliang Zhang2, Ding Hu2, Yu Song1, Haoran Man1, J. T. Park5, Huiqian Luo2, Shiliang Li2,6, Andriy H. Nevidomskyy1, and Pengcheng Dai1,†

  • 1Department of Physics and Astronomy & Rice Center for Quantum Materials, Rice University, Houston, Texas 77005, USA
  • 2Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 3Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
  • 4Max Planck Society Outstation at the Forschungsneutronenquelle Heinz Maier-Leibnitz (MLZ), D-85747 Garching, Germany
  • 5Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, 85748 Garching, Germany
  • 6Collaborative Innovation Center of Quantum Matter, Beijing, China

  • *Present Address: Paul Scherrer Institut, Swiss Light Source, CH-5232 Villigen PSI, Switzerland.
  • pdai@rice.edu

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Issue

Vol. 93, Iss. 13 — 1 April 2016

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