Tunable (deltapi, deltapi)-type antiferromagnetic order in alpha-Fe(Te,Se) superconductors.
The new alpha-Fe(Te,Se) superconductors share the common iron building block and ferminology with the LaFeAsO and BaFe(2)As(2) families of superconductors. In contrast with the predicted commensurate spin-density-wave order at the nesting wave vector (pi, 0), a completely different magnetic order with a composition tunable propagation vector (deltapi, deltapi) was determined for the parent compound Fe_{1+y}Te in this powder and single-crystal neutron diffraction study. The new antiferromagnetic order survives as a short-range one even in the highest T_{C} sample. An alternative to the prevailing nesting Fermi surface mechanism is required to understand the latest family of ferrous superconductors.
Bao
Wei
W
Department of Physics, Renmin University of China, Beijing 100872, China. wbao@ruc.edu.cn
Qiu
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Y
Huang
Q
Q
Green
M A
MA
Zajdel
P
P
Fitzsimmons
M R
MR
Zhernenkov
M
M
Chang
S
S
Fang
Minghu
M
Qian
B
B
Vehstedt
E K
EK
Yang
Jinhu
J
Pham
H M
HM
Spinu
L
L
Mao
Z Q
ZQ