Magnetic structures of RAgSb2 compounds

André, G.; Bourée, F.; Kolenda, M.; Leśniewska, Barbara; Oleś, Andrzej M.; Szytuła, A.

doi:10.1016/s0921-4526(00)00501-9

Cited by 48 publications

(39 citation statements)

References 25 publications

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“…6 The value of T N for the heavy R scales relatively well with the de Gennes factor (g J -1) 2 (J(J+1)) suggesting that the long-range ordering is mediated by RKKY indirect exchange. 3,6 On the other hand CeAgSb 2 orders ferromagnetically with a Curie temperature (T m ) ! 9.5 K. 3,6 In light of the Ce-Ce ion distance being 4.39 Å, which exceeds the Hill limit by about 30%, 7 magnetic ordering (rather than full, Kondo screening), is indeed expected.…”

Section: Introductionmentioning

confidence: 87%

“…5 The local moment bearing RAgSb 2 compounds display a rich variety of magnetic phenomena, including long range magnetic order at low temperatures with Néel temperatures (T N ) ranging from 2 -11 K. 1,3 Neutron diffraction data show that the RAgSb 2 (R = Pr, Nd, Tb, Dy, Ho, Er, Tm) compounds exhibit collinear antiferromagnetic order. 6 The value of T N for the heavy R scales relatively well with the de Gennes factor (g J -1) 2 (J(J+1)) suggesting that the long-range ordering is mediated by RKKY indirect exchange. 3,6 On the other hand CeAgSb 2 orders ferromagnetically with a Curie temperature (T m ) !…”

Section: Introductionmentioning

confidence: 87%

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Hydrostatic pressure study of pure and dopedLa1−xRxAgSb2
Torikachvili
¹
,
Bud’ko
²
,
Law
³

et al. 2007
Phys. Rev. B

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The intermetallic compound LaAgSb 2 displays two charge-density-wave (CDW) transitions, which were detected with measurements of electrical resistivity (!), magnetic susceptibility, and X-ray scattering; the upper transition takes place at T 1 ! 210 K, and it is accompanied by a large anomaly in !(T), whereas the lower transition is marked by a much more subtle anomaly at T 2 ! 185 K. We studied the effect of hydrostatic pressure (P) on the formation of the upper CDW state in pure and doped La 1-x R x AgSb 2 (R = Ce, Nd) compounds, by means of measurements of !(T) for P ! 23 kbar. We found that the hydrostatic pressure, as well as the chemical pressure introduced by the partial substitution of the smaller Ce and Nd ions for La, result in the suppression of the CDW ground state, e.g. the reduction of the ordering temperature T 1 . The values of dT 1 /dP are ! 2-4 times higher for the Ce-doped samples as compared to pure LaAgSb 2 , or even La 0.75 Nd 0.25 AgSb 2 Nd-doped with a comparable T 1 (P=0). This increased sensitivity to pressure may be due to increasing Ce-hybridization under pressure. The magnetic ordering temperature of the cerium-doped compounds is also reduced by pressure, and the high pressure behavior of the Ce-doped samples is dominated by Kondo impurity scattering.PACS Nos. 62.50.+p, 71.45.Lr, 75.20.Hr 2

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Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 87%

Hydrostatic pressure study of pure and dopedLa1−xRxAgSb2
Torikachvili
¹
,
Bud’ko
²
,
Law
³

et al. 2007
Phys. Rev. B

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“…This type of behavior has also been observed in the ferromagnetic compound CeAgSb 2 , where the CEF predicts moments in the ab-plane, but the experimental moment direction is along the c axis. 45,46 As this is a ferromagnet, the change in the easy axis direction can be clearly seen in the temperature dependence of the single-crystal susceptibility, which shows a crossover below the magnetic ordering temperature. 46 This is not the case for antiferromagnetically ordered systems, where no such crossover is seen.…”

Section: High-energy Ins Study To Investigate Cef Excitationsmentioning

confidence: 93%

Muon spin relaxation and neutron scattering investigations of the noncentrosymmetric heavy-fermion antiferromagnet CeRhGe3

et al. 2012

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The magnetic ground state of CeRhGe 3 has been investigated using magnetic susceptibility, heat capacity, neutron diffraction, muon spin relaxation (µSR), and inelastic neutron scattering (INS) techniques. Our µSR study clearly reveals the presence of two frequencies below T N2 = 7 K and three frequencies between 7 K and T N1 = 14.5 K, indicating long-range magnetic ordering of the Ce 3+ moment. The temperature dependence of the highest frequency follows a mean-field order parameter. Our powder neutron diffraction study at 1.5 K reveals the presence of magnetic Bragg peaks, indexed by the propagation vector k = (0, 0, 3/4) with the Ce 3+ magnetic moment ∼0.45(9) µ B along the c axis. INS studies at 18 K (i.e., above T N1 ) show the presence of two well-defined crystal-field (CEF) excitations at 7.5 and 18 meV. At 10 and 4.5 K, a very small increase has been observed in the CEF excitation energies. At 100 K, both CEF excitations broaden and a broad quasielastic component has also been observed. Further, the low-energy INS study reveals the presence of a nearly temperature-independent quasielastic linewidth between 16 and 60 K, which indicates a Kondo temperature T K = 12.6(3) K. The presence of well-defined CEF excitations in CeRhGe 3 suggests local moment magnetism and may explain the absence of pressure-induced superconductivity. Analyzing the INS data based on a CEF model, we have evaluated the CEF ground-state wave functions and ground-state moment. The observed small value of the ordered moment along the c axis, deduced from the neutron diffraction data, contrasts with the ab-plane moment direction predicted by the single-ion CEF anisotropy and indicates the presence of two-ion anisotropic magnetic exchange interactions, which govern the direction of the moment.

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“…The neutron data have been analysed via the Rietveld technique, using the FULLPROF [3] program. The neutron diffraction data above the Neel temperature indicate that these compounds crystallize in the ZrCuSi2-type structure [4]. In the diffraction pattern of CeAgSb2 at T = 1.4 K only two small intensity peaks of the magnetic origin are observed.…”

Section: Experimental and Resultsmentioning

confidence: 88%

“…[4]. The examination of X-ray pattern conflrmed the main tetragonal phase with a small concentration of other phases.…”

Section: Experimental and Resultsmentioning

confidence: 95%

Magnetic Ordering of RAgSb₂Compounds

et al. 2000

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The magnetic structures of the polycrystalline samples of RΑgSb 2 (R = Ce, Pr, Nd, Tb-Tm) are determined. All compounds crystallize in the tetragonal ΖrCuSi 2 -type of crystal structure and except CeΑgSb 2 they are antiferromagnets with a Neel temperature of 11 Κ for R = Tb and 2 Κ for Tm. CeΑgSb2 below Tc = 9.5 Κ is ferromagnet with the magnetic moment eqnal to 0.33μB and parallel to c-axis. In NdAgSb 2 the sine modulated magnetic ordering described by the wave vector k = (0.5435,0,0) is observed. Below TN a collinear antiferromagnetic structure with the magnetic (a, a, 2c) for R = Pr and (2a, a, c) for R = Tb, Dy, Ho, and Er is observed. For Ho-compound with an increase in temperature the coexistence of two strnctures is observed: commensurate collinear and incommensurate sine modulated. In TmAgSb2 the coexistence of the two phases is observed at Τ = 1.4 K. With an increase in temperature only the incommensurate phase stays.PACS numbers: 75.30.Cr, 75.30.Kz, 75.50.Εe 1. Introduction In the framework of our systematic studies of the magnetic properties of the rare-earth intermetallic compounds we present results of the neutron diffraction measurements of RΑgSb2 compounds, where R = Ce-Nd, Tb-Tm in this work. Recently we have reported on the structure and magnetic properties of ternary rare-earth RΑgSb 2 compounds. X-ray powder diffraction data indicate that these compounds crystallize in the tetragonal ΖrCuSi2-type structure (space group P4/nmm) [1]. RΑgSb 2 compounds, with R = Pr, Nd, Sm, Gd, Dy, Ho, Er, and Tm are antiferromagnets with the Néel temperatures lower than 13 K [1]. CeΑgSb2 is a ferromagnet with Τ = 12 [1] or 10 K [2]. In this work we present the results of the neutron diffraction measurements undertaken in order to determine the crystal and magnetic structures of RΑgSb2 compounds (R = Ce, Pr, Nd, Tb-Tm).

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Magnetic structures of RAgSb2 compounds

Cited by 48 publications

References 25 publications

Hydrostatic pressure study of pure and dopedLa1−xRxAgSb2
Torikachvili
¹
,
Bud’ko
²
,
Law
³

et al. 2007
Phys. Rev. B

Hydrostatic pressure study of pure and dopedLa1−xRxAgSb2
Torikachvili
¹
,
Bud’ko
²
,
Law
³

et al. 2007
Phys. Rev. B

Muon spin relaxation and neutron scattering investigations of the noncentrosymmetric heavy-fermion antiferromagnet CeRhGe3

Magnetic Ordering of RAgSb₂Compounds

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Magnetic structures of RAgSb2 compounds

Cited by 48 publications

References 25 publications

Hydrostatic pressure study of pure and dopedLa1−xRxAgSb2Torikachvili1, Bud’ko2, Law3 et al. 2007Phys. Rev. B

Hydrostatic pressure study of pure and dopedLa1−xRxAgSb2Torikachvili1, Bud’ko2, Law3 et al. 2007Phys. Rev. B

Muon spin relaxation and neutron scattering investigations of the noncentrosymmetric heavy-fermion antiferromagnet CeRhGe3

Magnetic Ordering of RAgSb2Compounds

Contact Info

Product

Resources

About

Hydrostatic pressure study of pure and dopedLa1−xRxAgSb2
Torikachvili
¹
,
Bud’ko
²
,
Law
³

et al. 2007
Phys. Rev. B

Hydrostatic pressure study of pure and dopedLa1−xRxAgSb2
Torikachvili
¹
,
Bud’ko
²
,
Law
³

et al. 2007
Phys. Rev. B

Magnetic Ordering of RAgSb₂Compounds