Coexistence of Eu antiferromagnetism and pressure-induced superconductivity in single-crystal EuFe2As2

被引：8

作者：

Jin, W. T. ^{[1
]}

Xiao, Y. ^{[2
]}

Nandi, S. ^{[3
,4
]}

Price, S. ^{[1
]}

Su, Y. ^{[1
]}

Schmalzl, K. ^{[5
]}

Schmidt, W. ^{[5
]}

Chatterji, T. ^{[6
]}

Thamizhavel, A. ^{[7
]}

Brueckel, Th ^{[1
,3
,4
,5
]}

机构：

[1] Forschungszentrum Julich, JCNS, Heinz Maier Leibnitz Zentrum MLZ, Lichtenbergstr 1, D-85747 Garching, Germany

[2] Peking Univ, Sch Adv Mat, Shenzhen Grad Sch, Shenzhen 518055, Peoples R China

[3] Forschungszentrum Julich, JCNS, D-52425 Julich, Germany

[4] Forschungszentrum Julich, PGI, JARA FIT, D-52425 Julich, Germany

[5] Forschungszentrum Julich, JCNS, ILL, Boite Postale 156, F-38042 Grenoble 9, France

[6] Inst Laue Langevin, 6 Rue Jules Horowitz, F-38042 Grenoble 9, France

[7] Tata Inst Fundamental Res, Dept Condensed Matter Phys & Mat Sci, Homi Bhabha Rd, Mumbai 400005, Maharashtra, India

来源：

PHYSICAL REVIEW B | 2019年 / 100卷 / 01期

关键词：

Hydrostatic pressure;

D O I：

10.1103/PhysRevB.100.014503

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

By performing high-pressure single-crystal neutron-diffraction measurements, the evolution of structure and magnetic ordering in EuFe2As2 under hydrostatic pressure were investigated. Both the tetragonal-toorthorhombic structural transition and the Fe spin-density-wave transition are gradually suppressed and become decoupled with increasing pressure. The antiferromagnetic order of the Eu sublattice is, however, robust against the applied pressure up to 24.7 kbar, without showing any change of the ordering temperature. Under the pressure of 24.7 kbar, the lattice parameters of EuFe2As2 display clear anomalies at 27(3) K, well consistent with the superconducting transition observed in previous high-pressure resistivity measurements. Such an anomalous thermal expansion around T-c strongly suggests the appearance of bulk superconductivity and strong electronlattice coupling in EuFe2As2 induced by the hydrostatic pressure. The coexistence of long-range ordered Eu antiferromagnetism and pressure-induced superconductivity is quite rare in the EuFe2As2-based iron pnictides.

引用

页数：6

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