Electronic specific heat in BaFe2xNixAs2

Dongliang Gong, Tao Xie, Xingye Lu, Cong Ren, Lei Shan, Rui Zhang, Pengcheng Dai, Yi-feng Yang, Huiqian Luo, and Shiliang Li
Phys. Rev. B 93, 134520 – Published 29 April 2016

Abstract

We have systematically studied the low-temperature specific heat of the BaFe2xNixAs2 single crystals covering the whole superconducting dome. Using the nonsuperconducting heavily overdoped x=0.3 sample as a reference for the phonon contribution to the specific heat, we find that the normal-state electronic specific heats in the superconducting samples may have a nonlinear temperature dependence, which challenges previous results in the electron-doped Ba-122 iron-based superconductors. A model based on the presence of ferromagnetic spin fluctuations may explain the data between x=0.1 and x=0.15, suggesting the important role of Fermi-surface topology in understanding the normal-state electronic states.

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  • Received 16 November 2015
  • Revised 30 March 2016

DOI:https://doi.org/10.1103/PhysRevB.93.134520

©2016 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
  1. Physical Systems
Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Dongliang Gong1, Tao Xie1, Xingye Lu1, Cong Ren1, Lei Shan1,2, Rui Zhang3, Pengcheng Dai3, Yi-feng Yang1,2, Huiqian Luo1,*, and Shiliang Li1,2,†

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 2Collaborative Innovation Center of Quantum Matter, Beijing, China
  • 3Department of Physics and Astronomy, Rice University, Houston, Texas 77005-1827, USA

  • *hqluo@iphy.ac.cn
  • slli@iphy.ac.cn

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Issue

Vol. 93, Iss. 13 — 1 April 2016

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