TY - JOUR
T1 - Extended electronic structure inhomogeneity created by double chain layer defects surrounding columnar tracks in heavy-ion irradiated YBa2Cu3O7-δ
AU - Kwon, Ji Hwan
AU - Meng, Yifei
AU - Wu, Lijun
AU - Zhu, Yimei
AU - Zhang, Yifei
AU - Selvamanickam, Venkat
AU - Welp, Ulrich
AU - Kwok, Wai Kwong
AU - Zuo, Jian Min
N1 - Funding Information:
This material is based upon work supported as part of the Center for Emergent Superconductivity, an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, under award number DE-AC0298CH10886. LW and YZ were funded by the US Department of Energy, Office of Basic Energy Science, Division of Materials Science and Engineering, under Contract No. DE-SC0012704.
PY - 2018/8/31
Y1 - 2018/8/31
N2 - In YBa2Cu3O7-δ (YBCO), heavy-ion irradiation creates continuous amorphous tracks that are highly effective for vortex pinning. However, the electronic structure landscape of defects and consequently their vortex pinning roles are unclear. Here, we show double chain layer (DCL) defects which intersect the columnar tracks are additionally produced by high energy Pb ion irradiation in YBCO. The DCL defects are ∼29 nm long, about three times the columnar defect diameter. The electronic structures of the DCL and columnar track defects were determined using atomic-resolution scanning transmission electron microscopy (STEM) and high resolution electron energy loss spectroscopy (EELS). Results show a decrease in the oxygen and copper content at the interface between the track and the YBCO matrix, resulting in interfacial strain. For the DCL defects, the STEM/EELS study revealed a localized electron doped CuO2 plane next to the DCL defect. The DCL defects thus further extend the electronic inhomogeneity into YBCO.
AB - In YBa2Cu3O7-δ (YBCO), heavy-ion irradiation creates continuous amorphous tracks that are highly effective for vortex pinning. However, the electronic structure landscape of defects and consequently their vortex pinning roles are unclear. Here, we show double chain layer (DCL) defects which intersect the columnar tracks are additionally produced by high energy Pb ion irradiation in YBCO. The DCL defects are ∼29 nm long, about three times the columnar defect diameter. The electronic structures of the DCL and columnar track defects were determined using atomic-resolution scanning transmission electron microscopy (STEM) and high resolution electron energy loss spectroscopy (EELS). Results show a decrease in the oxygen and copper content at the interface between the track and the YBCO matrix, resulting in interfacial strain. For the DCL defects, the STEM/EELS study revealed a localized electron doped CuO2 plane next to the DCL defect. The DCL defects thus further extend the electronic inhomogeneity into YBCO.
KW - critical current
KW - double chain layer defect
KW - electron energy loss spectroscopy
KW - high temperature superconductor
KW - scanning transmission electron microscopy
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U2 - 10.1088/1361-6668/aad842
DO - 10.1088/1361-6668/aad842
M3 - Article
AN - SCOPUS:85053381899
VL - 31
JO - Superconductor Science and Technology
JF - Superconductor Science and Technology
SN - 0953-2048
IS - 10
M1 - 105006
ER -