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Magnetic penetration depth in high-T c superconducting Tl2Ca1Ba2Cu2O8−δ single crystals (1992)

Ning, Hong ; Duan, H. ; Kirven, P. D. ; [et al.]

Springer

Journal of superconductivity 5 (1992), S. 503-509

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ISSN: 1572-9605

Keywords: Tl2Ca1Ba2Cu2O8−δ ; penetration depth ; single crystals

Source: Springer Online Journal Archives 1860-2000

Topics: Electrical Engineering, Measurement and Control Technology , Physics

Notes: Abstract The temperature dependence of Cu-O plane magnetic penetration depth,λ ab (T), for T1-2122 single crystals has been determined by measuring the low-field d.c. magnetization using a SQUID susceptometer. Almost full (97%) diamagnetism at low temperature was reached by carefully minimizing the background field, which is an essential condition for this method.λ ab (0) was obtained uniquely by a self-consistent condition to be 182 nm. Results of our measurements show a deviation from the single-band BCSs-wave prediction. The exponential behavior in very limited temperature regions may be reconciled with the BCS-like prediction. However, ourλ(T) data follow the theoretical prediction very accurately for ap-wave polar state pairing.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00618240

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Charge transfer complexes of N-ethylcarbazole and poly-N-vinylcarbazole (1968)

Rembaum, A. ; Hermann, A. M. ; Haack, R.

New York : Wiley-Blackwell

Journal of Polymer Science Part A-1: Polymer Chemistry 6 (1968), S. 1955-1963

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ISSN: 0449-296X

Keywords: Physics ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Poly-N-vinylcarbazole and its monomeric analog, i.e., N-ethylcarbazole, act as donors in charge transfer complexes with such electron acceptors as iodine, tetracyanoethylene, and tetracyanoquinodimethane. Poly-N-vinylcarbazole and N-ethylcarbazole are also capable of accepting electrons from an alkali metal such as sodium. A study of the spectral properties of both types of complexes showed that the monomer can both accept and donate electrons to a greater extent than the corresponding unit segment of the polymer chain. Equilibrium constants are presented for both cases, and estimates of the ionization potential of N-ethylcarbazole and related compounds are made from the characteristic charge transfer frequencies. Good agreement between these values and those calculated from molecular orbital theory is outlined.

Additional Material: 4 Ill.