Magnetic properties of UT2Si2 and UT2Ge2 (T = Co, Ni, Cu) intermetallic systems

Chełmicki, L.; Leciejewicz, J.; Zygmunt, A.

doi:10.1016/0022-3697(85)90214-8

Cited by 162 publications

(78 citation statements)

References 10 publications

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“…No effect on T N is observed in fields applied within the basal plane. This anisotropic response of T N on the applied magnetic field is consistent with the symmetry of the magnetic structure determined in [1], which consists of ferromagnetic basal-plane sheets of U moments, which are AF coupled along the c-axis.…”

Section: Resultssupporting

confidence: 84%

“…The specific heat exhibits a peak at 82.5 0.1 K, which we associate with T N ; the value is somewhat lower than that published in [1]. When applying a magnetic field B = 14 T along the c-axis the T N is reduced to 80.2 0.1 K as expected for an antiferromagnet.…”

Section: Resultsmentioning

confidence: 43%

“…A neutron powder diffraction experiment revealed that the compound is antiferromagnetic (AF) at temperatures below T N = 85 K. The magnetic moment was observed only at the U atom and amounts to 1.42(5) B at 4.2 K. The collinear magnetic structure is built of ferromagnetic basal-plane layers of U magnetic moments (aligned along the c-axis) with the + + stacking along the c-axis [1]. The so far reported magnetic data were obtained only on polycrystals and the results were rather contradictory [1,2]. This motivated us to grow a single crystal by Czochralski method and characterize it by measuring the specific heat (C), magnetization (M), and electrical resistivity ( ) with respect to temperature and magnetic field applied along the a-and c-axis.…”

Section: Introductionmentioning

confidence: 99%

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Magnetism of UCo₂Si₂Single Crystal Studied under Applied Magnetic Field and Hydrostatic Pressure

Mihalik

Kolomiyets²,

Griveau³

et al. 2007

J. Phys. Soc. Jpn.

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UCo 2 Si 2 is an antiferromagnet below T N = 82.4 K. The magnetic ordering is accompanied by the pronounced anomalies of resistivity, which are very different for the current direction along the a-and c-axis. Evolution of the T N -related resistivity features with increasing hydrostatic pressure up to 7.3 GPa was studied in order to reveal the pressure effects on magnetism in UCo 2 Si 2 . The T N value is found to decrease with increasing pressure; the critical pressure of collapse of ordered magnetism is estimated as 7.8. GPa.KEYWORDS: uranium compounds, specific heat, resistivity under hydrostatic pressure IntroductionUCo 2 Si 2 crystallizes in the orthorhombic ThCr 2 Si 2 -type crystal structure. A neutron powder diffraction experiment revealed that the compound is antiferromagnetic (AF) at temperatures below T N = 85 K. The magnetic moment was observed only at the U atom and amounts to 1.42(5) B at 4.2 K. The collinear magnetic structure is built of ferromagnetic basal-plane layers of U magnetic moments (aligned along the c-axis) with the + + stacking along the c-axis [1]. The so far reported magnetic data were obtained only on polycrystals and the results were rather contradictory [1,2]. This motivated us to grow a single crystal by Czochralski method and characterize it by measuring the specific heat (C), magnetization (M), and electrical resistivity ( ) with respect to temperature and magnetic field applied along the a-and c-axis. The T N -related features on the (T) curve were used to monitor the hydrostatic pressure effect on the U 5f-electron magnetism.

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 43%

Section: Introductionmentioning

confidence: 99%

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Magnetism of UCo₂Si₂Single Crystal Studied under Applied Magnetic Field and Hydrostatic Pressure

Mihalik

Kolomiyets²,

Griveau³

et al. 2007

J. Phys. Soc. Jpn.

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“…The crystal structure is tetragonal and of ThCr 2 Si 2 -type with the space group I4/mmm. These alloys have been extensively studied because of the rich variety in their magnetic properties [1][2][3][4]. The variation in the magnetic properties has been interpreted in terms of two parameters, namely, the inter-atomic distances between the U and T atoms, d U-T , and 5f(U)-3d(T) hybridization due to change in 3d electron concentration [1].…”

Section: Introductionmentioning

confidence: 99%

High-pressure X-ray diffraction study of UMn2Ge2

Siruguri

Paranjpe

Raj

et al. 2004

Physica B: Condensed Matter

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Uranium manganese germanide, UMn 2 Ge 2 , crystallizes in body-centered tetragonal ThCr 2 Si 2 structure with space group I4/mmm, a = 3.993Å and c = 10.809Å under ambient conditions. Energy dispersive X-ray diffraction was used to study the compression behaviour of UMn 2 Ge 2 in a diamond anvil cell. The sample was studied up to static pressure of 26 GPa and a reversible structural phase transition was observed at a pressure of ∼16.1 GPa. Unit cell parameters were determined up to 12.4 GPa and the calculated cell volumes were found to be well reproduced by a Murnaghan equation of state with K 0 = 73.5 GPa and K' =

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“…We have limited our studies at the Nuclear Research Centre -Negev (NRCN) on this family of compounds to the magnetic properties and structures in subfamilies with A = Ln or U and M = 3d-transition element: Co, Ni, Cu, In the past we studied some of the LnM2X2 compounds [1]. We subsequently completed the study of the UM 2 X 2 compounds [2], by determining the magnetic structure of UC02Ge2 [3].…”

Section: Introductionmentioning

confidence: 99%

Studies of Magnetic Interactions in Some Intermetallic AM<sub>2</sub>X<sub>2</sub> Compounds and Their Solid Solutions

Melamud¹,

Kuznietz²,

Pinto³

et al. 1998

J. Magn. Soc. Jpn.

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-Magnetic interactions in some intermetallic AM 2 X 2 compounds and their solid solutions have been investigated using ac-susceptibility and neutron-diffraction measurements. The materials studied (A = U, Nd, Tb; M = Co, Ni, Cu; X = Si, Ge) have predominantly the tetragonal ThCr2Sirtype crystal structure, and ordered magnetic moments are found only on the A site aligned along the tetragonal axis in ferromagnetic basal planes. The magnetic phase diagrams of the U(M,M')zX2 solid solutions have been determined. The results suggest RKKY -like magnetic interactions in these systems, with variable magnetic structure and oscillatory behaviour of the ordering and paramagnetic Curie temperatures. The relative orientation of ordered A and Ln magnetic moments in the (A,Ln)Co2Ge2 solid solutions have been determined. It is anti parallel for the (U,Tb) and (Nd,Tb) cases and parallel for the (U,Nd) case, in accordance with the "spin-charge" concept.

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Magnetic properties of UT2Si2 and UT2Ge2 (T = Co, Ni, Cu) intermetallic systems

Cited by 162 publications

References 10 publications

Magnetism of UCo₂Si₂Single Crystal Studied under Applied Magnetic Field and Hydrostatic Pressure

Magnetism of UCo₂Si₂Single Crystal Studied under Applied Magnetic Field and Hydrostatic Pressure

High-pressure X-ray diffraction study of UMn2Ge2

Studies of Magnetic Interactions in Some Intermetallic AM<sub>2</sub>X<sub>2</sub> Compounds and Their Solid Solutions

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Magnetic properties of UT2Si2 and UT2Ge2 (T = Co, Ni, Cu) intermetallic systems

Cited by 162 publications

References 10 publications

Magnetism of UCo2Si2Single Crystal Studied under Applied Magnetic Field and Hydrostatic Pressure

Magnetism of UCo2Si2Single Crystal Studied under Applied Magnetic Field and Hydrostatic Pressure

High-pressure X-ray diffraction study of UMn2Ge2

Studies of Magnetic Interactions in Some Intermetallic AM<sub>2</sub>X<sub>2</sub> Compounds and Their Solid Solutions

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Product

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Magnetism of UCo₂Si₂Single Crystal Studied under Applied Magnetic Field and Hydrostatic Pressure

Magnetism of UCo₂Si₂Single Crystal Studied under Applied Magnetic Field and Hydrostatic Pressure