Long- and short-range magnetic order, charge transfer, and superconductivity in YBa2Cu3−xCoxO7
F. Maury, I. Mirebeau, J. A. Hodges, P. Bourges, Y. Sidis, A. Forget
DOI 10.1103/PhysRevB.69.094506 · Physical Review B
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Abstract
We have performed powder-neutron-diffraction measurements in YBa2Cu3−xCoxO7 for a large range of Co concentrations (x=0.04–0.72) and determined the magnetic phase diagram. As previously observed, superconductivity disappears for x>~0.42 and antiferromagnetic long-range order emerges above this value. The antiferromagnetic order shows noticeable differences compared to that in unsubstituted YBa2Cu3O6+δ and surprisingly survives to a much higher hole doping. In contrast to recent results in YBa2Cu3−xCoxO7 single crystals, there is no evidence of any long-range antiferromagnetic order in the superconducting phase. The Co valence evolves from 4+ to 3+ with increasing Co concentration. We studied the short-range chemical and magnetic correlations between the Co ions in superconducting (x<~0.36) and antiferromagnetic (x>~0.42) samples. The Co ions predominantly occupy the Cu1 sites and their moments remain mostly disordered, forming random antiferromagnetic next nearest neighbor pairs, which compete with the long-range order. This can explain the low value for the ordered Cu1 site moment.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3-xCoxO7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91.5 | Pressure not reported | onset |
| YBa2Cu3-xCoxO7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22 | Pressure not reported | onset |
| YBa2Cu3-xCoxO7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | Pressure not reported | onset |
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