| Autor: |
Prokhnenko, O., Ritter, C., Arnold, Z., Isnard, O., Kamara´d, J., Pirogov, A., Teplykh, A., Kuchin, A. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 7/1/2002, Vol. 92 Issue 1, p385, 7p, 1 Diagram, 1 Chart, 13 Graphs |
| Abstrakt: |
The influence of hydrostatic pressure (up to 5 kbar) on the magnetic structure of Ce[sub 2]Fe[sub 17] was investigated using neutron diffraction in the temperature range from 2 to 300 K. The existence of a collinear ferromagnetic phase below 95 K with a magnetic moment of Fe, m[sub Fe] = 2.0 μ[sub B], was confirmed at ambient pressure. Magnetic peaks present between 95 and 205 K correspond to an incommensurate antiferromagnetic structure with a wave vector changing its value from τ[sub 1] = 0.026 Å[sup -1] at 100 K to τ[sub 1] = 0.034 Å[sup -1] at 205 K. A helical model is used to describe the magnetic structure. Application of high pressures leads to significant changes of the magnetic structure. The ferromagnetic phase, suppressed in the studied temperature range by pressures higher than 3 kbar, gets substituted by a new incommensurate antiferromagnetic phase. This phase can be described as a superposition of the helical structure with a second antiferromagnetic coupling with propagation vector τ[sub 2] ≈ 0.078 Å[sup -1] at 40 K under pressures above 3 kbar. The correlation with recent results of magnetization studies under pressure is analyzed and discussed. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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