Specific-heat data around the critical temperature Tc = 90 K of polycrystalline YBal 8Cao 2Cu408 show a discontinui\_ty ACp/Tc = 22 mJ/mol K z. In undoped YBa2Cu408 and in YBa2Cu307,'the corresponding anomalies are 15 mJ/mol K z and 55 mJ/mol K z. The in-plane London penetration depthoof the Ca-dope
An opposite dependence of Tc on quenching in YBa2Cu4O8
โ Scribed by Guo Hansheng
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 403 KB
- Volume
- 1
- Category
- Article
- ISSN
- 0964-1807
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๐ SIMILAR VOLUMES
The pressure dependence of the superconducting transition temperature T, of the new structure YBa 2 Cu.Os was measured on bulk material and single crystals as well. The differential dT,/dp was determined to be 0.55 K/kbar. Such a large change of T, with increasing pressure was never observed before
The existence of local moments in both Zn-and Ni-doped YBa2Cu408 (Y1248) is confirmed by a Curie-law T-dependence of NMR linewidth and the Cu relaxation at low T. The reduction of Cu-NQR signal intensity in Ni-doped Y1248 suggests that, in contrast to the case of Ni-doped YBa2Cu30 7 (Y1237), the Cu