High pressure neutron diffraction studies of the magnetic structures of erbium

Sørensen, S.Å.; Lebech, B.

doi:10.1016/0304-8853(94)00756-x

Cited by 7 publications

(6 citation statements)

References 4 publications

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“…2 The experimental results at 6.5, 7.5, 10.5, and 12 kbar are nearly identical, except for the alterations due to the systematic shifts in the transition temperatures and the ͑minor͒ differences shown in Fig. 2, which appear below 10-20 K. This indicates that Q must behave in the same way in the four cases and similar to that measured by Kawano et al 15 at 11.5 and 14 kbar. Thus, at 7.5 kbar, Q is assumed to be locked to the value 2 7 c* below about 45 K, and to be the same as at ambient pressure above this temperature.…”

Section: ͑5͒supporting

confidence: 79%

“…The only significant difference between the cycloidal structures at low and high values of the pressure is the way the ordering wave vector depends on temperature. The neutron diffraction experiments show that Q stays constant at 2 7 c* below T N Ј at 11.5 and 14 kbar, 15 in contrast to the rapid variation, by about 20%, shown by Q at ambient pressure. Hence, the only explanation for the deficiency of the theory at low pressure is that ⌫ u in Eq.…”

Section: ͑5͒mentioning

confidence: 72%

“…Utilizing this result, Jensen and Mackintosh predicted that the magnetoelastic en-ergies would cause the cone structure to be unstable at all temperatures, when applying a hydrostatic pressure of more than approximately 2.5 kbar. 13 There have been two recent reports of the influence of hydrostatic pressure on the magnetic structures of Er by Kawano et al 14,15 They measured the magnetic Bragg peaks at an applied pressure of 11.5 and 14 kbar. At 11.5 kbar T N is reduced to 82 K. The ordering wave vector goes through a maximum at 50 K, and below about 40 K it stays constant at the value 2 7 c*.…”

Section: Introductionmentioning

confidence: 99%

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Pressure-dependent resistivity and magnetoresistivity of erbium

et al. 2000

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A comprehensive resistance study of erbium subjected to a hydrostatic pressure is presented. From the experimental results we derive a p-T phase diagram for the magnetic phases in erbium. In the zero-temperature limit, the conical structure is predicted to transform into the cycloidal one at a pressure of about 1.3 kbar. Experimentally, the transition is found to occur between 1 and 3 kbar at 4.5 K. The experimental results are analyzed in terms of a variational calculation of the resistivity using the model developed for erbium from previous experiments. The theory of Elliott and Wedgwood is utilized in the account of the superzone effects. The analysis indicates that the a-axis resistivity is slightly affected by the superzones. In the c-axis case the superzone effects do not simply scale with the magnetization, but also reflect the 20% change of the ordering wave vector. This occurs between T N and T C at ambient pressure, and at 4.5 K when the pressure is increased from 1 to 3 kbar. It is tentatively proposed that the tilted cycloidal structure exists in Er, just above T C at ambient pressure and in the interval between 1.3 and 9 kbar at zero temperature.

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Section: ͑5͒supporting

confidence: 79%

Section: ͑5͒mentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

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Pressure-dependent resistivity and magnetoresistivity of erbium

et al. 2000

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“…Figure 1b presents the results of scans made along [0,0,L] in order to determine the ordering wave vectors at various pressures. We include the results of our experiments performed on PRISMA together with results reported by Kawano et al [5]. Our results from PRISMA demonstrate self-consistency in two experiments, and reveal only a modest change in the wave vector at the transition shown in Figure 1a between 0.5 and 3.5 kbar.…”

Section: Methodssupporting

confidence: 48%

Neutron Diffraction Study of the p - T Phase Diagram for Erbium

Ellerby

McEwen

Jensen

et al. 2002

High Pressure Research

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Electrical resistivity measurements performed on a single crystal of erbium as a function of temperature and hydrostatic pressure have provided a preliminary p-T phase diagram. The results have been interpreted in terms of a model for the magnetic structures of Er deduced from neutron diffraction studies at ambient pressure. This model predicted the existence of a magnetic structure with a wave vector of Q ¼ 2=7 c* at 4.2 K, when the applied pressure is larger than 3 kbar. This paper reports a neutron diffraction study of erbium made in the temperature range of 4 to 100 K, at pressures between 0.5 and 6 kbar. We have observed the predicted suppression of the low temperature conical ferromagnetic phase and the emergence of a new phase with Q ¼ 8=33 c*. The neutron diffraction measurements has enabled us to identify the various phases that develop from the cycloidal phases previously observed at atmospheric pressure.

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“…Neutron diffraction studies of the magnetic structure by Kawano, et al [15,16] found at 1.15 and 1.4 GPa pressure that the transition to the ferromagnetic conical structure is completely suppressed with the elliptical cycloidal structure persisting down to 4.5 K. The CAM antiferromagnetic ordering decreased from 84 K at ambient pressure to 82 K at 1.4 GPa pressure while the cycloidal structure at 1.4 GPa was initially observable at 46 K. The suppression of the low-temperature ferromagnetic conical structure under pressure was confirmed by another neutron diffraction study [17] at 6.0 K which suggested at pressures as low as 0.5 GPa that the conical phase is destroyed. Other studies of the pressure-vs.-temperature phase diagrams are based on a very limited number of pressure-dependent resistivity and magnetic susceptibility measurements.…”

Section: Introductionmentioning

confidence: 99%

Magnetic and structural phase transitions in erbium at low temperatures and high pressures

et al. 2011

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Electrical resistance and crystal structure measurements have been carried out on polycrystalline erbium (Er) at temperatures down to 10 K and pressures up to 20 GPa. An abrupt change in the slope of the resistance is observed with decreasing temperature below 84 K which is associated with the c-axis modulated antiferromagnetic (AFM) ordering of the Er moments. With increasing pressure, the temperature of the resistance slope change and the corresponding AFM ordering temperature decrease until vanishing above 10.6 GPa. The disappearance of the slope change in the resistance occurs at similar pressures where the hcp structural phase of Er is transformed to a nine-layer α-Sm structural phase as confirmed by our high-pressure synchrotron X-ray diffraction studies. These results suggest that the disappearance in the antiferromagnetic ordering of Er moments is strongly correlated to the structural phase transition at high pressures and low temperatures. PACS

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High pressure neutron diffraction studies of the magnetic structures of erbium

Cited by 7 publications

References 4 publications

Pressure-dependent resistivity and magnetoresistivity of erbium

Pressure-dependent resistivity and magnetoresistivity of erbium

Neutron Diffraction Study of the p - T Phase Diagram for Erbium

Magnetic and structural phase transitions in erbium at low temperatures and high pressures

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