A 159Tb NMR study of Tb2Fe17

Li, Y.; Graham, R. G.; Bunbury, D St P; Mitchell, P.W.; McCausland, M A H

doi:10.1016/0304-8853(94)01481-7

Cited by 11 publications

(6 citation statements)

References 11 publications

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“…The full quadrupole-split spectra of 159 Tb in Tb 2 Fe 17 C x (x = 1.5, 2) are shown in figure 2. The hyperfine parameters a t and P t deduced from those spectra are listed in table 2 together with those determined previously for Tb 2 Fe 17 (Li et al 1995).…”

Section: Resultsmentioning

confidence: 84%

“…Previous hyperfine studies at the lanthanide sites include Mössbauer spectroscopy of 169 Tm in Tm 2 Fe 17 C x (Gubbens et al 1989) and of 155 Gd in Gd 2 Fe 17 C x (Dirken et al 1989) and NMR of 89 Y in Y 2 Fe 17 C x (Kapusta et al 1991). In the present paper we report the extension of our previous hyperfine study of Tb 2 Fe 17 (Li et al 1995) to Tb 2 Fe 17 C x (x = 1, 1.5, 2).…”

Section: Introductionmentioning

confidence: 79%

“…The principal aim of our analysis is to estimate the extra-ionic quadrupolar parameter 4) 114( 4) 142(4) † ν (x) mn denotes frequency differences between the neighbouring peak positions, x the carbon concentration, and m and n the neighbouring peak labels in figure 1. ‡ Li et al (1995). § B t = 2πa t /γ where γ /2π = 10.13 MHz T −1 (after Bleaney 1988).…”

Section: Resultsmentioning

confidence: 99%

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Hyperfine splitting of terbium in

Graham

Ross

et al. 1996

J. Phys.: Condens. Matter

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We have studied the zero-field hyperfine splitting of in ferrimagnetic (x = 1, 1.5, 2) using spin-echo NMR at 4.2 K. Distinct spectra arising from the different sites characterized by the numbers of carbon nearest neighbours (NN = 0, 1, 2, 3) are observed. The measured hyperfine parameters and for all four spectra are given for x = 1.5 and 2. Analysis of the quadrupolar splitting indicates that in the dominant contribution to the magnetocrystalline anisotropy arises from the NN = 3 sites.

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Section: Resultsmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

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Hyperfine splitting of terbium in

Graham

Ross

et al. 1996

J. Phys.: Condens. Matter

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“…Those compounds with R = Y, Gd, and Tb can crystallize in either Th 2 Zn 17 or Th 2 Ni 17 -type crystal structures, depending on the annealing process. 35,36 In the Th 2 Zn 17 -type crystal structure, the crystallographic sites for the iron atoms are 6c, 9d, 18f, and 18h in the Wyckoff notation and the unique 6c site for the rare earth atoms. For the Th 2 Ni 17 -type crystal structure, the Fe atoms occupy the 4f, 6g, 12j, and 12k sites, while the R element is located at two nonequivalent positions, 2b and 2d.…”

Section: Introductionmentioning

confidence: 99%

Magnetovolume and magnetocaloric effects in Er2Fe17

et al. 2012

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Combining different experimental techniques, investigations in hexagonal P 6 3 /mmc Er 2 Fe 17 show remarkable magnetovolume anomalies below the Curie temperature, T C . The spontaneous magnetostriction reaches 1.6 × 10 −2 at 5 K and falls to zero well above T C , owing to short-range magnetic correlations. Moreover, Er 2 Fe 17 exhibits direct and inverse magnetocaloric effects (MCE) with moderate isothermal magnetic entropy S M , and adiabatic temperature T ad changes [ S M ∼ −4.7 J(kgK) −1 and T ad ∼ 2.5 K near the T C , and S M ∼ 1.3 J(kgK)and T ad ∼ −0.6 K at 40 K for H = 80 kOe, respectively, determined from magnetization measurements].The existence of an inverse MCE seems to be related to a crystalline electric field-level crossover in the Er sublattice and the ferrimagnetic arrangement between the magnetic moments of the Er and Fe sublattice. The main trends found experimentally for the temperature dependence of S M and T ad as well as for the atomic magnetic moments are qualitatively well described considering a mean-field Hamiltonian that incorporates both crystalline electric field and exchange interactions. S M (T ) and T ad (T ) curves are essentially zero at ∼150 K, the temperature where the transition from direct to inverse MCE occurs. A possible interplay between the MCE and the magnetovolume anomalies is also discussed.

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“…The values of MA constants for Tb 2 Fe 17 can be estimated from NMR data [23] (see Ref. [24]), K Tb = −10 J/cm 3 , K Tb = 3 J/cm 3 for the positions 2b and 2d, K Fe = −3 J/cm 3 .…”

Section: Fomp Scenarios For Various Experimental Situationsmentioning

confidence: 99%

A new mechanism of first-order magnetization in multisublattice rare-earth compounds

Irkhin

2002

J. Phys.: Condens. Matter

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First-order field-induced spin reorientation transitions in multisublattice intermetallic compounds are considered within an anisotropic Heisenberg model. Unlike previous works, only leading-order anisotropy constants of the sublattices are included. The exchange interactions both between the rare-earth (RE) and transition metal (TM) sublattices and within the RE sublattice play an important role in the model. The latter interaction results in the occurrence of metastable states. One of the minima corresponds to the non-collinear magnetic structure where the RE subsystem is divided into two sublattices, and their moments deviate in opposite directions from the TM moment direction. The possible FOMP scenarios for R2Fe17, HoFe11Ti, and TbMn6Sn6 systems are discussed.

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A 159Tb NMR study of Tb2Fe17

Cited by 11 publications

References 11 publications

Hyperfine splitting of terbium in

Hyperfine splitting of terbium in

Magnetovolume and magnetocaloric effects in Er2Fe17

A new mechanism of first-order magnetization in multisublattice rare-earth compounds

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