Effect of substitution of Ca2+ for Eu2+ on pressure-induced superconductivity in EuFe2As2

Akihiro Mitsuda; Tomohiro Matoba; Satoshi Seike; Fumihiro Ishikawa; Yuh Yamada; Hirofumi Wada

doi:10.1143/JPSJS.80SA.SA117

Effect of substitution of Ca²⁺ for Eu²⁺ on pressure-induced superconductivity in EuFe₂As₂

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

Condensed Matter Physics

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

To elucidate competition between the Fe-based superconductivity and the antiferromagnetic order of Eu²⁺, the electrical resistivity of Eu_0.85Ca_0.15Fe₂As₂ under high pressure is presented. Under ambient pressure, the Fe-based spin-density-wave (SDW) transition and the antiferromagnetic ordering (AFM) of Eu²⁺ are observed at T_SDW = 190 K and T_N = 17 K, respectively. With applying pressure, the Fe-based superconductivity with T_c ∼ 25 K appears above 1.5 GPa, accompanying collapse of the SDW transition. Compared with EuFe₂As₂, T_c is close to T _N, which implies strong competition between the superconductivity and the AFM. This competition would lead to non-zero resistivity at lowest temperature.

Original language	English
Article number	SA117
Journal	journal of the physical society of japan
Volume	80
Issue number	SUPPL. A
DOIs	https://doi.org/10.1143/JPSJS.80SA.SA117
Publication status	Published - Jul 2011

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1143/JPSJS.80SA.SA117

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title = "Effect of substitution of Ca2+ for Eu2+ on pressure-induced superconductivity in EuFe2As2",

abstract = "To elucidate competition between the Fe-based superconductivity and the antiferromagnetic order of Eu2+, the electrical resistivity of Eu0.85Ca0.15Fe2As2 under high pressure is presented. Under ambient pressure, the Fe-based spin-density-wave (SDW) transition and the antiferromagnetic ordering (AFM) of Eu2+ are observed at TSDW = 190 K and TN = 17 K, respectively. With applying pressure, the Fe-based superconductivity with Tc ∼ 25 K appears above 1.5 GPa, accompanying collapse of the SDW transition. Compared with EuFe2As2, Tc is close to T N, which implies strong competition between the superconductivity and the AFM. This competition would lead to non-zero resistivity at lowest temperature.",

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T1 - Effect of substitution of Ca2+ for Eu2+ on pressure-induced superconductivity in EuFe2As2

AU - Mitsuda, Akihiro

AU - Matoba, Tomohiro

AU - Seike, Satoshi

AU - Ishikawa, Fumihiro

AU - Yamada, Yuh

AU - Wada, Hirofumi

PY - 2011/7

Y1 - 2011/7

N2 - To elucidate competition between the Fe-based superconductivity and the antiferromagnetic order of Eu2+, the electrical resistivity of Eu0.85Ca0.15Fe2As2 under high pressure is presented. Under ambient pressure, the Fe-based spin-density-wave (SDW) transition and the antiferromagnetic ordering (AFM) of Eu2+ are observed at TSDW = 190 K and TN = 17 K, respectively. With applying pressure, the Fe-based superconductivity with Tc ∼ 25 K appears above 1.5 GPa, accompanying collapse of the SDW transition. Compared with EuFe2As2, Tc is close to T N, which implies strong competition between the superconductivity and the AFM. This competition would lead to non-zero resistivity at lowest temperature.

AB - To elucidate competition between the Fe-based superconductivity and the antiferromagnetic order of Eu2+, the electrical resistivity of Eu0.85Ca0.15Fe2As2 under high pressure is presented. Under ambient pressure, the Fe-based spin-density-wave (SDW) transition and the antiferromagnetic ordering (AFM) of Eu2+ are observed at TSDW = 190 K and TN = 17 K, respectively. With applying pressure, the Fe-based superconductivity with Tc ∼ 25 K appears above 1.5 GPa, accompanying collapse of the SDW transition. Compared with EuFe2As2, Tc is close to T N, which implies strong competition between the superconductivity and the AFM. This competition would lead to non-zero resistivity at lowest temperature.

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Effect of substitution of Ca²⁺ for Eu²⁺ on pressure-induced superconductivity in EuFe₂As₂

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