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Valency and spin states of substituent cations in Bi_{2.15}Sr_{1.85}CaCu_{2}O_{8+δ}
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Benseman, T., Cooper, J., Zentile, C., Lemberger, L. and Balakrishnan, G. (2011) Valency and spin states of substituent cations in Bi_{2.15}Sr_{1.85}CaCu_{2}O_{8+δ}. Physical Review B (Condensed Matter and Materials Physics), Vol.84 (No.14). Article No. 144503 . doi:10.1103/PhysRevB.84.144503
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Official URL: http://dx.doi.org/10.1103/PhysRevB.84.144503
Abstract
We studied the valency and spin behavior of M = Mn, Fe, Co, Li, and Al in the high-temperature superconducting compound Bi(2.15)Sr(1.85)Ca(Cu(1-z)Mz)(2)O(8+delta) (Bi-2212) for small values of z. Mn, Fe, and Co retain their magnetic moments, and our thermopower and magnetic susceptibility data imply ionization states Mn(3+), Fe(2+), and Co(2+), while Li and Al are accommodated in the charge reservoir layers. Single-crystal studies show that the susceptibility of Co(2+) ions in Bi-2212 is strongly anisotropic, with a weak anisotropy detected for Mn(3+) and none for Fe(2+). Fits to a pseudogap formula for a pure Bi-2212 crystal suggest that the spin susceptibility of the host compound is more anisotropic than previously realized. Data in the superconducting state allow us to compare the pair-breaking properties of the different impurities. Several aspects of the data, including the stronger suppression of the superconducting transition temperature T(c) by Co compared with Fe for underdoped and optimally doped samples, show that the d-level structure of the magnetic ions and multiorbital effects are important. We also find that the temperatures of the magnetization crossing points are equal to the low-field T(c) values to within 1% or 2%. This agrees with a 2D thermodynamic fluctuation argument given by Junod et al.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Divisions: | Faculty of Science > Physics | ||||
| Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||
| Publisher: | American Physical Society | ||||
| ISSN: | 1098-0121 | ||||
| Official Date: | 2011 | ||||
| Dates: |
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| Volume: | Vol.84 | ||||
| Number: | No.14 | ||||
| Number of Pages: | 10 | ||||
| Page Range: | Article No. 144503 | ||||
| DOI: | 10.1103/PhysRevB.84.144503 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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