Coexistence of superconductivity and spin density wave in underdoped YBa2Cu4O8
โ Scribed by Kazumasa Katayama; Yuzo Yoshida; Takato Machi; Seiji Adachi; Takekazu Ishida
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 385 KB
- Volume
- 412-414
- Category
- Article
- ISSN
- 0921-4534
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Samples of YBazCudOs are prepared by means of a new high oxygen pressure technique employing oxygen-HIP. Both magnetization and resistivity measurements show the superconductivity transition at 82.5 K. The lower and upper critical fields of YBa&\_t40s are obtained from the magnetization measurements
NMR has been carded out in YBa2Cu4Oa with T~= 74 K. The nuclear quadrupole tensors in the oxygen sites were determined and compared with those in other h, igh-T~ cuprates. The hole densities in the oxygen and copper sites have been extracted from v~(O) and vQ(Cu) by assuming that the electric field
We have presented the results of Zn and Ga substitution in place of Cu in YBa,&Os (Y-124). The samples of YBaZ(Cu,\_,Zn,)40s with x=0.00-0.20 and YBaZ(Cu,\_,GaX)dOs with x=0.01-0.10 were synthesised at ambient oxygen pressure using sodium oxalate. With increase in concentration of Zn in Y-124 no sig