Neutron diffraction study of magnetic structure of and

Gukasov, Arsen; Wiśniewski, Piotr; Henkie, Z.

doi:10.1088/0953-8984/8/49/044

Cited by 16 publications

(6 citation statements)

References 17 publications

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“…Recent polarized neutron studies of the magnetic distribution in some ferromagnetic and paramagnetic materials with the T h 3 P 4 cubic structure have shown that the moment induced by a magnetic field at equivalent crystallographic sites may be very different [1,2,3]. Such a behavior can arise when the local symmetry of the magnetic ion is lower than the overall symmetry of the crystal.…”

Section: Introductionmentioning

confidence: 99%

Spin density and non-collinear magnetization in frustrated pyrochlore from polarized neutron scattering

Gukasov

Cao

Mirebeau

et al. 2009

Physica B: Condensed Matter

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We used a local susceptibility approach in extensive polarized neutron diffraction studies of the spin liquid Tb2Ti2O7. For a magnetic field applied along the [110] and [111] directions, we found that, at high temperature, all Tb moments are collinear and parallel to the field. With decreasing temperature, the Tb moments reorient from the field direction to their local anisotropy axes. For the [110] field direction, the field induced magnetic structure at 10 K is spin ice-like, but with two types of Tb moments of very different magnitudes. For a field along [111], the magnetic structure resembles the so-called "one in-three out" found in spin ices, with the difference that all Tb moments have an additional component along the [111] direction due to the magnetic field. The temperature evolution of the local susceptibilities clearly demonstrates a progressive change from Heisenberg to Ising behavior of the Tb moments when lowering the temperature, which appears to be a crystal field effect.

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Section: Introductionmentioning

confidence: 99%

Spin density and non-collinear magnetization in frustrated pyrochlore from polarized neutron scattering

Gukasov

Cao

Mirebeau

et al. 2009

Physica B: Condensed Matter

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“…Recently a rather peculiar magnetic structure was found in the ferromagnetically ordered compounds U 3 Sb 4 and U 3 Bi 4 . This structure was found to contain uranium atoms of two types occupying the same crystallographic position but having different values of magnetic moment [1]. Later, a similar effect was observed in the paramagnetic compounds Sm 3 Te 4 [2,3] and Nd 3−x S 4 , for which the moments induced by a magnetic field on the rare-earth (RE) ions in equivalent sites differed considerably.…”

Section: Introductionmentioning

confidence: 70%

Freestanding Individual Single-walled Carbon Nanotube Synthesis Based on Plasma Sheath Effects

Kato

Jeong

Hirata

et al. 2004

Jpn. J. Appl. Phys.

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Polarized neutron diffraction provides information about the magnetization density of each individual crystallographic site. In the present paper the role of the atomic site susceptibility tensor χ i j accounting for the magnetic response of individual atoms to an external magnetic field is discussed. The symmetry of this tensor is very similar to that of the tensor u i j describing the thermal motion of atoms. By analogy with the atomic displacement parameters (ADPs), atomic susceptibility parameters (ASPs) can be introduced.The six independent ASPs can be determined from polarized neutron flipping ratio measurements and visualized as magnetic ellipsoids which are analogous to the thermal ellipsoids obtained from ADPs. If the local anisotropy is small, these magnetic ellipsoids approximate to spheres with diameters proportional to the induced magnetization. In other cases, anomalous (elongated or flattened) ellipsoids will occur. The ASPs have been determined for the compound Nd 3−x S 4 which has the Th 3 P 4 structure. They correspond to strongly oblate magnetic ellipsoids; in contrast, in the isomorphous compound Sm 3 Te 4 the magnetic ellipsoids are found to be prolate.

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“…This estimation assumes that the impurity moments equal 2:5· B . This value is intermediate between about 2· B , observed for uranium in U 3 Sb 4 (Gukasov et al 1996, Henkie et al 1987 and 2:7· B in USb (Burlet et al 1980). It is unlikely that the estimated number of magnetic impurities could be responsible for such a strong observed Kondo scattering of electrons, if they form only some U 3 Sb 4 ferromagnetic cluster.…”

Section: Magnetizationmentioning

confidence: 82%

“…An eOE ect of hybridization of U 5f electrons with the conduction electrons leads to a decrease in the ordered magnetic moment and makes the magnetic behaviour of uranium ions sensitive to a change in their chemical environment (Sheng et al 1994). Indeed, the antimony-richer (U 3 Sb 4 (Gukasov et al 1996)) and antimony-poorer (U 5 Sb 4 (PaixaÏ o et al 1994)) compounds, lying in the U± Sb phase diagram closest to USb, are ferromagnets.…”

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confidence: 99%

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Low-temperature resistivity and thermoelectric power controlled by defects in the USb antiferromagnet

Wawryk¹

2001

Philosophical Magazine B

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The resistivity »…T †, magnetoresistivity, magnetization and thermoelectric power S…T † of several USb crystals have been examined in the temperature range 0.03± 300 K, in magnetic ® elds up to 14 T. The resistivity ratio …RR †…² »…300 K †/»(4.2 K)) of examined crystals ranged from 1.6 to 13. It was found that defects, which decrease the RR, contribute both to »(T) in the shape of a temperature dependent Kondo-like component and to S…T † by means of a peak-like component. The »…T † curve shows a maximum below 2 K and a minimum between 8 and 14 K, depending on the RR. S…T † reaches a maximum at 40 K, which is as large as 40 mV K ¡1 for the sample with RRˆ13. The low-temperature »…T † behaviour indicates a Kondo temperature of 37 K, fairly close to the temperature of the S…T † maximum. The origin of the Kondo-like behaviour of the resistivity and the thermoelectric power of USb crystals at low temperatures is discussed.

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Neutron diffraction study of magnetic structure of and

Cited by 16 publications

References 17 publications

Spin density and non-collinear magnetization in frustrated pyrochlore from polarized neutron scattering

Spin density and non-collinear magnetization in frustrated pyrochlore from polarized neutron scattering

Freestanding Individual Single-walled Carbon Nanotube Synthesis Based on Plasma Sheath Effects

Low-temperature resistivity and thermoelectric power controlled by defects in the USb antiferromagnet

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