Tl valence change and T-c enhancement (> 130 K) in (Cu,Tl)Ba2Ca2Cu3Oy due to nitrogen annealing - art. no. 064508

Authors
Tanaka, K Iyo, A Terada, N Tokiwa, K Miyashita, S Tanaka, Y Tsukamoto, T Agarwal, SK Watanabe, T Ihara, H
Citation
K. Tanaka et al., Tl valence change and T-c enhancement (> 130 K) in (Cu,Tl)Ba2Ca2Cu3Oy due to nitrogen annealing - art. no. 064508, PHYS REV B, 6305(6), 2001, pp. 4508
Citations number
51
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
01631829 → ACNP
Volume
6305
Issue
6
Year of publication
2001
Database
ISI
SICI code
0163-1829(20010201)6305:6<4508:TVCATE>2.0.ZU;2-2
Abstract
Annealing effects in a reducing environment (flowing nitrogen) in the tempe rature range of 200-600 degreesC are reported on the high Tl content (Cu1-x Tlx)Ba2Ca2Cu3Oy system, synthesized under high pressure (4.5 GPa). A consid erable enhancement in T-c from 97 K (as-synthesized) to >130 K (annealed at 550 degreesC) and an anomalous behavior in the resistivity with annealing is found. The results have been analyzed in the context of the loss of oxyg en and Tl valence change.