Antiferromagnetic transition inEuFe2As2: A possible parent compound for superconductors

2008/06/30 by Zhi Ren, Zengwei Zhu, Shuai Jiang +9 · 4 citations
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Rare-earth and actinide compounds #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.78.052501

published as PHYSICAL REVIEW B 78, 052501 (2008) · 4 pages, 4 figures

openalex publication_date 2008/08/05 · arxiv created 2008/08/14 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

Ternary iron arsenide EuFe₂As₂ with ThCr₂Si₂-type structure has been studied by magnetic susceptibility, resistivity, thermopower, Hall, and specific-heat measurements. The compound undergoes two magnetic phase transitions at about 200 and 20 K, respectively. The former was found to be accompanied with a slight drop in magnetic susceptibility (after subtracting the Curie-Weiss paramagnetic contribution), a rapid decrease in resistivity, a large jump in thermopower, and a sharp peak in specific heat with decreasing temperature, all of which point to a spin-density-wave-like antiferromagnetic transition. The latter was proposed to be associated with an A-type antiferromagnetic ordering of Eu²⁺ moments. Comparing with the physical properties of the isostructural compounds BaFe₂As₂ and SrFe₂As₂, we expect that superconductivity could be induced in EuFe₂As₂ through appropriate doping.

Citations

• Proximity of antiferromagnetism and superconductivity inLaFeAsO1−xFx: Effective Hamiltonian fromab initiostudies
• Competing orders and spin-density-wave instability in La(O 1−x F x )FeAs

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