Cells for far infrared absorption measurements on polar liquids

1971 ◽  
Vol 4 (8) ◽  
pp. 620-621 ◽  
Author(s):  
J W Fleming and G J Davies
Keyword(s):  
Infrared Absorption ◽  
Far Infrared ◽  
Polar Liquids ◽  
Absorption Measurements

High-pressure far-infrared absorption measurements on La1−xCaxMnO3−δ by means of synchrotron radiation

2006 ◽  
Vol 49 (1-2) ◽  
pp. 92-95
Author(s):  
A. Sacchetti ◽  
M. Cestelli Guidi ◽  
E. Arcangeletti ◽  
P. Postorino ◽  
A. Nucara ◽  
...  
Keyword(s):  
High Pressure ◽  
Synchrotron Radiation ◽  
Infrared Absorption ◽  
Far Infrared ◽  
Absorption Measurements

Far-Infrared Absorption Measurements of Polypeptides and Cytochromecby THz Radiation

2002 ◽  
Vol 75 (5) ◽  
pp. 1083-1092 ◽  
Author(s):  
Kohji Yamamoto ◽  
Keisuke Tominaga ◽  
Hiroaki Sasakawa ◽  
Atsuo Tamura ◽  
Hidetoshi Murakami ◽  
...  
Keyword(s):  
Infrared Absorption ◽  
Far Infrared ◽  
Thz Radiation ◽  
Absorption Measurements

Far-Infrared Absorption in Bulk Samples of Superconducting d-h.c.p. Lanthanum

1972 ◽  
Vol 50 (20) ◽  
pp. 2549-2551
Author(s):  
L. W. Kry ◽  
D. Hemming
Keyword(s):  
Infrared Absorption ◽  
Far Infrared ◽  
A Value ◽  
Gap Width ◽  
Absorption Measurements

Far-infrared absorption measurements have been made on bulk samples of d-h.c.p. lanthanum and the results indicate a gap width, 2Δ, of 11.6 ± 0.3 cm−1 or 1.44 ± 0.04 meV. Using a value of Tc = 4.87 ± 0.02 °K, taken from the literature, this gives 2Δ = (3.43 ± 0.09)kTc.

Temperature and Frequency Dependence of the Infrared Absorption in Three Kinds of Bi-Based Compounds

1992 ◽  
Vol 275 ◽  
Author(s):  
Y. Hayashi ◽  
Y. Harada ◽  
H. Sasakura ◽  
M. Nagayama
Keyword(s):  
Absorption Band ◽  
Infrared Absorption ◽  
Far Infrared ◽  
Infrared Region ◽  
Free Carrier Absorption ◽  
Phonon Modes ◽  
Superconducting Compounds ◽  
Carrier Absorption ◽  
Absorption Measurements ◽  
Made In

ABSTRACTInfrared absorption measurements have been made in three kinds of Bi compounds of a high-Tc family mainly by making use of powdered samples. Two of them are superconductors with Tc's of 108 K and 82 K, respectively, and the remaining one is a semiconductor. In each of the superconducting compounds, there appears Mid-Infrared absorption band: No such absorption band is found in the semiconducting compound. At Far-Infrared region, many absorption peaks due to phonons are clearly detected in all of these samples. Some of the phonon modes have been identified. At very low energy region, free carrier absorption appears in superconductors. Only this part of the absorption shows a temperature dependence. Absorption intensity decreases as the temperature decreases.

Far-infrared absorption in bulk samples of superconducting niobium and tantalum

1970 ◽  
Vol 48 (10) ◽  
pp. 1254-1258 ◽  
Author(s):  
D. Hemming ◽  
R. Sati ◽  
J. D. Leslie
Keyword(s):  
Critical Temperature ◽  
Infrared Absorption ◽  
Far Infrared ◽  
Gap Width ◽  
Absorption Measurements ◽  
Good Agreement

Measurements have been made of far-infrared absorption in bulk samples of superconducting niobium and tantalum at 1.41 °K. The results indicate a gap width 2Δ of 23.8 ± 0.2 cm−1 for niobium and 10.3 ± 0.2 cm−1 for tantalum. The measured values of the critical temperature, Tc, for these samples are 9.38 ± 0.04 °K for niobium and 4.33 ± 0.02 °K for tantalum. In terms of these values of Tc, 2Δ is 3.66 ± 0.05 kTc for niobium and 3.43 ± 0.08 kTc for tantalum. These values of 2Δ are in good agreement with those obtained by other methods, unlike earlier far-infrared absorption measurements on bulk niobium and tantalum that indicated anomalously low values of 2Δ.

Sign in / Sign up

Export Citation Format

Share Document