TY - JOUR
T1 - Magnetoelastic coupling and charge correlation lengths in a twin domain of Ba(Fe1-xCox)2As2 (x=0.047)
T2 - A high-resolution x-ray diffraction study
AU - Zhang, Qiang
AU - Wang, Wenjie
AU - Kim, Jong Woo
AU - Hansen, Benjamin
AU - Ni, Ni
AU - Bud'Ko, Sergey L.
AU - Canfield, Paul C.
AU - McQueeney, Robert J.
AU - Vaknin, David
PY - 2013/3/18
Y1 - 2013/3/18
N2 - The interplay between structure, magnetism, and superconductivity in single crystal Ba(Fe1-xCox)2As2 (x=0.047) has been studied using high-resolution x-ray diffraction by monitoring charge Bragg reflections in each twin domain separately. The emergence of the superconducting state is correlated with the suppression of the orthorhombic distortion around TC, exhibiting competition between orthorhombicity and superconductivity. Above TS, the in-plane charge correlation length increases with the decrease of temperature, possibly induced by nematic fluctuations in the paramagnetic tetragonal phase. Upon cooling, anomalies in the in-plane charge correlation lengths along a (ξa) and b axes (ξb) are observed at TS and also at TN indicative of strong magnetoelastic coupling. The in-plane charge correlation lengths are found to exhibit anisotropic behavior along and perpendicular to the in-plane component of stripe-type AFM wave vector (101)O below around TN. The temperature dependence of the out-of-plane charge correlation length shows a single anomaly at TN, reflecting the connection between Fe-As distance and Fe local moment. The origin of the anisotropic in-plane charge correlation lengths ξa and ξb is discussed on the basis of the antiphase magnetic domains and their dynamic fluctuations.
AB - The interplay between structure, magnetism, and superconductivity in single crystal Ba(Fe1-xCox)2As2 (x=0.047) has been studied using high-resolution x-ray diffraction by monitoring charge Bragg reflections in each twin domain separately. The emergence of the superconducting state is correlated with the suppression of the orthorhombic distortion around TC, exhibiting competition between orthorhombicity and superconductivity. Above TS, the in-plane charge correlation length increases with the decrease of temperature, possibly induced by nematic fluctuations in the paramagnetic tetragonal phase. Upon cooling, anomalies in the in-plane charge correlation lengths along a (ξa) and b axes (ξb) are observed at TS and also at TN indicative of strong magnetoelastic coupling. The in-plane charge correlation lengths are found to exhibit anisotropic behavior along and perpendicular to the in-plane component of stripe-type AFM wave vector (101)O below around TN. The temperature dependence of the out-of-plane charge correlation length shows a single anomaly at TN, reflecting the connection between Fe-As distance and Fe local moment. The origin of the anisotropic in-plane charge correlation lengths ξa and ξb is discussed on the basis of the antiphase magnetic domains and their dynamic fluctuations.
UR - http://www.scopus.com/inward/record.url?scp=84875340342&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.87.094510
DO - 10.1103/PhysRevB.87.094510
M3 - Article
AN - SCOPUS:84875340342
SN - 1098-0121
VL - 87
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 9
M1 - 094510
ER -