Spontaneous formation of a superconducting and antiferromagnetic hybrid state in SrFe2As2 under high pressure.
We report a novel superconducting (SC) and antiferromagnetic (AF) hybrid state in SrFe(2)As(2) revealed by (75)As nuclear magnetic resonance (NMR) experiments on a single crystal under highly hydrostatic pressure up to 7 GPa. The NMR spectra at 5.4 GPa indicate simultaneous development of the SC and AF orders below 30 K. The nuclear spin-lattice relaxation rate in the SC domains shows a substantial residual density of states, suggesting proximity effects due to the spontaneous formation of a nanoscale SC-AF hybrid structure. This entangled behavior is a remarkable example of a self-organized heterogeneous structure in a clean system.
Kitagawa
K
K
Institute for Solid State Physics, University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581, Japan. kitag@issp.u-tokyo.ac.jp
Katayama
N
N
Gotou
H
H
Yagi
T
T
Ohgushi
K
K
Matsumoto
T
T
Uwatoko
Y
Y
Takigawa
M
M