Pressure-induced superconductivity in Eu0.5Ca 0.5Fe2As2: Wide zero-resistivity region due to suppression of Eu magnetic order and chemical pressure

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

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Abstract

To clarify competition between FeAs-based superconductivity and antiferromagnetism of Eu2+, and the superconducting properties in EuFe2As2, we investigated a Ca-substituted sample, Eu 0.5Ca0.5Fe2As2, under high pressure. Under ambient pressure, the sample exhibits a spin-density-wave (SDW) transition at TSDW = 191K and antiferromagnetic order at T N = 4K, 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 = 20K. At 2.14 GPa, Tc reaches a maximum value of 24 K and the superconducting transition becomes sharpest. The chemical pressure and the suppression of Eu magnetic order induced by Ca substitution enlarge the zero resistivity region compared to pure EuFe 2As2.

Original languageEnglish
Article number073704
Journaljournal of the physical society of japan
Volume79
Issue number7
DOIs
Publication statusPublished - Jul 1 2010

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superconductivity
retarding
electrical resistivity
antiferromagnetism
substitutes
shift

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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Pressure-induced superconductivity in Eu0.5Ca 0.5Fe2As2 : Wide zero-resistivity region due to suppression of Eu magnetic order and chemical pressure. / Mitsuda, Akihiro; Matoba, Tomohiro; Ishikawa, Fumihiro; Yamada, Yuh; Wada, Hirofumi.

In: journal of the physical society of japan, Vol. 79, No. 7, 073704, 01.07.2010.

Research output: Contribution to journalArticle

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abstract = "To clarify competition between FeAs-based superconductivity and antiferromagnetism of Eu2+, and the superconducting properties in EuFe2As2, we investigated a Ca-substituted sample, Eu 0.5Ca0.5Fe2As2, under high pressure. Under ambient pressure, the sample exhibits a spin-density-wave (SDW) transition at TSDW = 191K and antiferromagnetic order at T N = 4K, 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 = 20K. At 2.14 GPa, Tc reaches a maximum value of 24 K and the superconducting transition becomes sharpest. The chemical pressure and the suppression of Eu magnetic order induced by Ca substitution enlarge the zero resistivity region compared to pure EuFe 2As2.",
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AU - Yamada, Yuh

AU - Wada, Hirofumi

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AB - To clarify competition between FeAs-based superconductivity and antiferromagnetism of Eu2+, and the superconducting properties in EuFe2As2, we investigated a Ca-substituted sample, Eu 0.5Ca0.5Fe2As2, under high pressure. Under ambient pressure, the sample exhibits a spin-density-wave (SDW) transition at TSDW = 191K and antiferromagnetic order at T N = 4K, 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 = 20K. At 2.14 GPa, Tc reaches a maximum value of 24 K and the superconducting transition becomes sharpest. The chemical pressure and the suppression of Eu magnetic order induced by Ca substitution enlarge the zero resistivity region compared to pure EuFe 2As2.

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