TY  - JOUR
AU  - Jin, Wentao
AU  - Nandi, Shibabrata
AU  - Xiao, Yinguo
AU  - Su, Yixi
AU  - Zaharko, O
AU  - Guguchia, Z.
AU  - Bukowski, Z.
AU  - Price, Stephen
AU  - Jiao, W. H.
AU  - Cao, G. H.
AU  - Brückel, Thomas
TI  - Magnetic structure of superconducting Eu(Fe$_{0.82}$Co$_{0.18}$)$_2$As$_2$ as revealed by single-crystal neutron diffraction
JO  - Physical review / B
VL  - 88
IS  - 21
SN  - 1098-0121
CY  - College Park, Md.
PB  - APS
M1  - FZJ-2014-00046
SP  - 214516
PY  - 2013
AB  - The magnetic structure of superconducting Eu(Fe$_{0.82}$Co$_{0.18}$)$_2$As$_2$ is unambiguously determined by single-crystal neutron diffraction. A long-range ferromagnetic order of the $Eu^{2+}$ moments along the c direction is revealed below the magnetic phase transition temperature $T_C$=17 K. In addition, the antiferromagnetism of the $Fe^{2+}$ moments still survives and the tetragonal-to-orthorhombic structural phase transition is also observed, although the transition temperatures of the Fe spin-density-wave (SDW) order and the structural phase transition are significantly suppressed to $T_N$=70 K and $T_S$=90 K, respectively, compared to the parent compound EuFe$_2$As$_2$. We present microscopic evidence for the coexistence of the Eu ferromagnetism and the Fe SDW in the superconducting crystal. The superconductivity competes with the Fe SDW in Eu(Fe$_{0.82}$Co$_{0.18}$)$_2$As$_2$. Moreover, the comparison between Eu(Fe$_{1−x}$Co$_x$)$_2$As$_2$ and Ba(Fe$_{1−x}$Co$_x$)$_2$As$_2$ indicates a considerable influence of the rare-earth element Eu on the magnetism of the Fe sublattice.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000331751200008
DO  - DOI:10.1103/PhysRevB.88.214516
UR  - https://juser.fz-juelich.de/record/141677
ER  -