Hybridization effects in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">U</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="italic">T</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><i>X</i>compounds: Magnetic structu

Nakotte, H.; Purwanto, Agus; Robinson, R. A.; Prokeš, K.; Klaasse, J.C.P.; Châtel, P.F. de; Boer, F.R. de; Havela, L.; Sechovský, V.; Pereira, L. C. J.; Seret, Alain; Rébizant, J.; Spirlet, J.C.; Trouw, F.

doi:10.1103/physrevb.53.3263

Cited by 35 publications

(10 citation statements)

References 26 publications

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“…The present result is in good agreement with our recent neutron powder diffraction study. [11] Similar non-collinear structures have been reported in U 2 T 2 X with the same space group P 4/mbm and magnetic U atoms at 4h [19,20]; Nd at 4g site has the same site symmetry shifted 1/2 along z. The magnetic structure in phase II is shown in Fig.…”

Section: (A)supporting

confidence: 75%

Polarized neutron scattering study of the multiple order parameter system NdB4

et al. 2018

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Neutron polarization analysis has been carried out in order to clarify the magnetic structures of multiple order parameter f -electron system NdB 4 . We confirmed the non-collinear 'all-in all-out' structure (Γ 4 ) of the in-plane moment, which is in good agreement with our previous neutron powder diffraction study. We found that the magnetic moment along the c-axis m c showed diagonally antiferromagnetic structure (Γ 10 ), inconsistent with previously reported 'vortex' structure (Γ 2 ). The microscopic mixture of these two structures with q 0 =(0, 0, 0) appears in phase II and remains stable in phases III and IV, where an incommensurate modulation coexists. The unusual magnetic ordering is phenomenologically understood via Landau theory with the primary order parameter Γ 4 coupled with higher-order secondary order parameter Γ 10 . The magnetic moments were estimated to be 1.8 ± 0.2 and 0.2 ± 0.05µ B at T =7.5 K for Γ 4 and Γ 10 , respectively. We also found that a long-period incommensurate modulation of the q 1 =(0, 0, 1/2) antiferromagnetic structure of m c with the propagation q s1 =(0.14, 0.14, 0.1) and q s2 =(0.2, 0, 0.1) in phase III and IV, respectively. The amplitude of sinusoidal modulation was about m c = 1.0 ± 0.2µ B at T =1.5 K. The local (0, 0, 1/2) structure consists of in-plane ferromagnetic and out-of-plane antiferromagnetic coupling of m c , opposite to the coexisting Γ 10 . The m c of Γ 10 is significantly enhanced up to 0.6µ B at T =1.5 K, which is accompanied by the incommensurate modulations. The Landau phenomenological approach indicates the higer-order magnetic and/or multipole interactions based on pseudo-quartet f -electron state play important role. * metoki.naoto@jaea.go.jp It is becoming ever more apparent that the unusual magnetic properties in rare earth and actinide compounds come from the nature of f -electrons with multiple order parameters and their competing interactions. Multipole ordering has been successfully understood in some light rare-earth [1-5] and actinide [6] compounds with small f -electron number, in most cases n ≤ 2. The f -electron states and the corresponding excitation spectra under crystalline electric field (CEF) are relatively simple in comparison with heavy rare-earth which are often very complicated and difficult to determine experimentally [7-9]. In this paper, we focused on NdB 4 , a challenge for Nd 3+ with 4f 3 , having 4 I 9/2 ground state. NdB 4 exhibits successive magnetic transitions at T 0 = 17.2 K, T N1 = 7.0 K, and T N2 = 4.8 K[10]. Previous magnetic and thermodynamic studies revealed the paramagnetic phase I (T > T 0 ), phase II (T N1 < T < T 0 ), phase III (T N2 < T < T N1 ), and phase IV (T < T N2 ), where the specific heat shows two λ-type anomalies at T N1 and T 0 , and a first-order-like anomaly at T N2 . The system with half-integer J favors magnetic ordering to release the entropy of the Kramers degeneracy. The mechanism of the successive transitions in NdB 4 , especially the type of order parameters, has not been fully understood. The g...

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Section: (A)supporting

confidence: 75%

Polarized neutron scattering study of the multiple order parameter system NdB4

et al. 2018

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“…We performed neutron diffraction experiments on the same polycrystalline U 2 Pd 2 Sn and U 2 Ni 2 In samples that were used in previous studies [7,8]. The experiments were performed on powders of about 20 g of material, which were encapsulated under helium atmosphere in vanadium tubes.…”

Section: Methodsmentioning

confidence: 99%

“…Data were taken at various temperatures in the available temperature range between 10 K and room temperature. For each temperature, we counted for at least 4 h. For the analysis of U 2 Ni 2 In, we have included the low-temperature data at 1.8 and 4.2 K previously taken at the Intense Pulsed Neutron Source, Argonne National Laboratory [8]. Using the Rietveld refinement program package GSAS [9], we determined the structural parameters of both compounds taking into account reflections with d spacings up to 1 Å found in the highest-angle detector banks.…”

Section: Methodsmentioning

confidence: 99%

“…U 2 Pd 2 Sn orders at T N = 40 K and U 2 Ni 2 In orders at T N = 14 K [4]. Previous studies revealed non-collinear in-plane moment configurations for both compounds [7,8]. However, the magnetic structures of these two compounds differ mostly in the fact that the exchange interaction along the c-axis is ferromagnetic in U 2 Pd 2 Sn whereas it is antiferromagnetic in U 2 Ni 2 In [8].…”

Section: Introductionmentioning

confidence: 97%

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Effect of temperature on hybridization and magnetism in U2Pd2Sn and U2Ni2In

Nakotte

El-Khatib

Christianson

et al. 2004

Journal of Alloys and Compounds

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“…Both materials are antiferromagnets below the Néel temperature, T N = 25 K [4][5][6][7][8][9][10][11][12][13][14][15][16]. For U 2 Ni 2 Sn, the U-U distances within the basal plane of a tetragonal crystal structure, 3.575 Å, are substantially shorter than those along the c axis, 3.693 Å [4,6,11]. Consequently, the magnetic moments align along the c axis [9].…”

Section: Introductionmentioning

confidence: 99%

Acoustic signatures of the phase transitions in the antiferromagnet U2Rh2Sn

et al. 2020

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We report on ultrasound measurements in a single crystal of the antiferromagnet U 2 Rh 2 Sn as a function of temperature and magnetic field. We find pronounced anomalies in the sound velocity at the Néel temperature, 25 K, and at the field-induced spin-flop-like transition at 22.5 T, which points to a strong magnetoelastic coupling. Additionally, we find that in the paramagnetic regime the temperature dependence of the magnetic susceptibility and the field dependences of the magnetization and sound velocity of transverse acoustic waves can be well described assuming a localized character of the 5 f electrons. Using this premise, the crystal-electric-field scheme of U 2 Rh 2 Sn has been determined.

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Hybridization effects inU2T2Xcompounds: Magnetic structu

Cited by 35 publications

References 26 publications

Polarized neutron scattering study of the multiple order parameter system NdB4

Polarized neutron scattering study of the multiple order parameter system NdB4

Effect of temperature on hybridization and magnetism in U2Pd2Sn and U2Ni2In

Acoustic signatures of the phase transitions in the antiferromagnet U2Rh2Sn

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