TY - JOUR
T1 - High frequency properties of YBCO thin films diagnosed by time-domain terahertz spectroscopy
AU - Kiwa, Toshihiko
AU - Tonouchi, Masayoshi
N1 - Funding Information:
We are grateful to Prof. Masanori Hangyo for his persistent encouragement and helpful discussions. M. Tonouchi acknowledges the partial support by a Grant-in-Aid for Scientific Research on Priority Areas (A) under grant no. 10142101 and a Grant-in-Aid for Scientific Research (B) under grant no. 12450146, from the Ministry of Education, Science, Sports, and Culture, Japan.
PY - 2001/9
Y1 - 2001/9
N2 - We measure the complex conductivity σ and the surface impedance of c-axis oriented 100-nm-thick YBa2Cu3O7-δ (YBCO) thin films deposited on (100)MgO substrates (0.5 mm thick) at frequencies between 0.5 and 1.5 THz, using time-domain terahertz spectroscopy. The real part of σ decreases with increasing frequency and its value is about 2.4×105 (S/m) at 1 THz. The imaginary part of σ increases with increasing frequency and then monotonically decreases at around 750 GHz. The real part of σ of YBCO thin films increased with decreasing temperature and decreases below 60 K. The imaginary part of σ increased with decreasing temperature and the trend is enhanced below 60 K. The surface resistance of YBCO thin film is of the order of 10-1Ω and increases with increasing temperature. The surface reactance of YBCO thin film is independent of the frequency in this THz region, and its value is less than 10-3Ω at 40 K.
AB - We measure the complex conductivity σ and the surface impedance of c-axis oriented 100-nm-thick YBa2Cu3O7-δ (YBCO) thin films deposited on (100)MgO substrates (0.5 mm thick) at frequencies between 0.5 and 1.5 THz, using time-domain terahertz spectroscopy. The real part of σ decreases with increasing frequency and its value is about 2.4×105 (S/m) at 1 THz. The imaginary part of σ increases with increasing frequency and then monotonically decreases at around 750 GHz. The real part of σ of YBCO thin films increased with decreasing temperature and decreases below 60 K. The imaginary part of σ increased with decreasing temperature and the trend is enhanced below 60 K. The surface resistance of YBCO thin film is of the order of 10-1Ω and increases with increasing temperature. The surface reactance of YBCO thin film is independent of the frequency in this THz region, and its value is less than 10-3Ω at 40 K.
KW - Complex conductivity
KW - Surface impedance
KW - Time-domain terahertz spectroscopy
KW - YBCO
UR - http://www.scopus.com/inward/record.url?scp=0035448474&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0035448474&partnerID=8YFLogxK
U2 - 10.1016/S0921-4534(01)00695-5
DO - 10.1016/S0921-4534(01)00695-5
M3 - Article
AN - SCOPUS:0035448474
VL - 362
SP - 314
EP - 318
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - 1-4
ER -