Physics – Condensed Matter – Superconductivity
Scientific paper
1998-11-18
Phys. Rev. Lett. 82(1999)461.
Physics
Condensed Matter
Superconductivity
Slightly extended version of Comment accepted to Phys. Rev. Lett. (v.81, N24, 1998), tentatevely to be publ. 14Dec98. 1 page,
Scientific paper
10.1103/PhysRevLett.82.461
Recently, Zou et al. (Phys. Rev. Lett. 80, 1074, 1998) reported the observation of bulk superconductivity (SC) for a PrBa_2Cu_3O_x (Pr123) single crystal grown by the traveling-solvent floating zone (TSFZ) method. The aim of this Comment is to show the inconsistency of the value of effective magnetic moment \mu_{eff} reported by Zou et al. (2.92\mu_B) with their magnetic susceptibility data. The estimation made directly from their data points gives a considerably smaller value of \mu_{eff}=2.09\mu_B. At the same time the values of mu_{eff}=2.9\mu_B and 3.1\mu_B were obtained for our Pr123 single crystals grown by flux method for H||ab-plane and H||c-axis, respectively. This suggests that Pr occupies only about a half of the RE sites in TSFZ crystal. The other half of the RE sites is occupied most probably by the nonmagnetic Ba. Noteworthy, SC with T_c=43 K was observed earlier for Pr_{0.5}Ca_{0.5}Ba_2Cu_3O_{7-y} thin films. Ba^{2+} has a larger ionic radius than Pr^{3+} and so the substitution of Ba for Pr could give a natural explanation not only for the SC in TSFZ Pr123 but also for the elongation of the distance between the CuO_2 planes observed by Zou et al.
Drechsler Stefan-Ludwig
Narozhnyi V. N.
No associations
LandOfFree
Comment on ``Superconducting PrBa_2Cu_3O_x'' does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Comment on ``Superconducting PrBa_2Cu_3O_x'', we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Comment on ``Superconducting PrBa_2Cu_3O_x'' will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-515396