TY - JOUR
T1 - Anomaly in the Complex Conductivity of Overdoped Y1-xCaxBa2Cu3O7-delta Thin Films from THz Spectroscopy
AU - Bachar, N.
AU - Zhukova, E.
AU - Gorshunov, B.
AU - Farber, E.
AU - Roth, M.
N1 - Funding Information:
This work was supported in part by the Ministry of Science and Technology (MOST), State of Israel, and by the Russian Foundation for Basic Research (RFBR), Russian Federation, and reference number 06-02-72023-MHTN_a.
PY - 2011/4
Y1 - 2011/4
N2 - We measured the complex conductivity of Ca-doped YBCO thin films in the THz frequency range. The films were measured using both Time domain and Frequency domain methods for THz spectroscopy. We show that a subgap exists in the overdoped samples of 5% and 10% Ca doping. The subgap appears as a sharp decrease in the real part of conductivity at frequencies equivalent to gap energy of 1 meV and is more prominent with increased doping. We suggest that this decrease in conductivity is related to a d-{x{2}-y{2}} -wave pairing symmetry with an imaginary part of is or id xy . The imaginary part of the conductivity shows the well-known 1/ω behavior, but its ωσ 2 product shows a dip in the spectrum at about ∼1 meV.
AB - We measured the complex conductivity of Ca-doped YBCO thin films in the THz frequency range. The films were measured using both Time domain and Frequency domain methods for THz spectroscopy. We show that a subgap exists in the overdoped samples of 5% and 10% Ca doping. The subgap appears as a sharp decrease in the real part of conductivity at frequencies equivalent to gap energy of 1 meV and is more prominent with increased doping. We suggest that this decrease in conductivity is related to a d-{x{2}-y{2}} -wave pairing symmetry with an imaginary part of is or id xy . The imaginary part of the conductivity shows the well-known 1/ω behavior, but its ωσ 2 product shows a dip in the spectrum at about ∼1 meV.
UR - http://www.scopus.com/inward/record.url?scp=79952573512&partnerID=8YFLogxK
U2 - 10.1007/s10948-010-1114-0
DO - 10.1007/s10948-010-1114-0
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AN - SCOPUS:79952573512
SN - 1557-1939
VL - 24
SP - 1225
EP - 1228
JO - Journal of Superconductivity and Novel Magnetism
JF - Journal of Superconductivity and Novel Magnetism
IS - 3
ER -