Article thumbnail

Pressure-induced superconductivity in Eu$_{0.5}$Ca$_{0.5}$Fe$_2$As$_2$ : FeAs-based superconductivity hidden by antiferromagnetism of Eu sublattice

By Akihiro Mitsuda, Tomohiro Matoba, Hirofumi Wada, Fumihiro Ishikawa and Yuh Yamada

Abstract

To clarify superconductivity in EuFe2As2 hidden by antiferromagnetism of Eu2+, we investigated a Ca-substituted sample, Eu0.5Ca0.5Fe2As2, under high pressure. For ambient pressure, the sample exhibits a spin-density-wave (SDW) transition at TSDW = 191 K and antiferromagnetic order at TN = 4 K, but no evidence of superconductivity down to 2 K. The Ca-substitution certainly weakens the antiferromagnetism. With increasing pressure, TSDW shifts to lower temperature and becomes more unclear. Above 1.27 GPa, pressure-induced superconductivity with zero resistivity is observed at around Tc = 20 K. At 2.14 GPa, Tc reaches a maximum value of 24 K and the superconducting transition becomes the sharpest. These features of emergence of the superconductivity are qualitatively similar to those observed in AFe2As2 (A = Ba, Ca).Comment: 4 pages, 4 figure

Topics: Condensed Matter - Superconductivity, Condensed Matter - Strongly Correlated Electrons
Publisher: 'Japan Society of Applied Physics'
Year: 2009
DOI identifier: 10.1143/JPSJ.79.073704
OAI identifier: oai:arXiv.org:0911.0862

Suggested articles


To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.