On the ferromagnetic structure of the intermetallic borocarbide TbCo<sub>2</sub>B<sub>2</sub>C

ElMassalami, M.; Moreno, R.; Saeed, Ramzan; Chaves, Francisco A.; Chaves, C. M.; Rapp, R.E.; Takeya, Hiroyuki; Ouladdiaf, B.; Amara, M.

doi:10.1088/0953-8984/21/21/216006

Cited by 7 publications

(22 citation statements)

References 45 publications

(119 reference statements)

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“…The Ce compound again violates the monotonic dependencies due to a deviation from the trivalent state. A distortion of the tetragonal unit cell to an orthorhombic metric by magnetostriction for TbCo 2 [B 2 C] below the Curie temperature of 6.3 K was already pointed out above [138].…”

Section: Fementioning

confidence: 95%

Rare-earth metal transition metal borocarbide and nitridoborate superconductors

Niewa¹,

Shlyk²,

Blaschkowski

2011

Zeitschrift Für Kristallographie

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Abstract. Few years after the discovery of superconductivity in high-T c cuprates, borocarbides and shortly after nitridoborates with reasonably high T c s up to about 23 K attracted considerable attention. Particularly for the rareearth metal series with composition RNi 2 [B 2 C] it turned out, that several members exhibit superconductivity next to magnetic order with both T c above or below the magnetic ordering temperature. Therefore, these compounds have been regarded as ideal materials to study the interplay and coexistence of superconductivity and long range magnetic order, due to their comparably high ordering temperatures and similar magnetic and superconducting condensation energies. This review gathers information on the series

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Section: Fementioning

confidence: 95%

Rare-earth metal transition metal borocarbide and nitridoborate superconductors

Niewa¹,

Shlyk²,

Blaschkowski

2011

Zeitschrift Für Kristallographie

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“…10,12,17,18 Powder neutrondiffractograms were collected at the high resolution powder diffractometer D2B of the Institut Laue-Langevin (ILL), France (λ = 1.6Å, T = 1.5K and 30K), and were analyzed by the same Rietveld package. The diffractograms of the end members were not measured since these have already been determined.…”

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confidence: 99%

“…The diffractograms of the end members were not measured since these have already been determined. 10,12,19 Magnetizations and susceptibilities (2K < T < 20K and H ≤ 90 kOe) were measured on a Physical Properties Measurement System of Quantum Design; specific heat curves (1.8K < T < 40K and H = 0, 30 kOe) were measured on a relaxation-type calorimeter using the same environment as that used for the magnetization measurements. The results obtained from these thermodynamic techniques (which will appear elsewhere 20 ) provide independent confirmation of the picture to be discussed below.…”

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confidence: 99%

“…[3][4][5][6][7][8] Apart from the interesting issue of coexistence (which highlights the importance of electron interactions, with themselves as well as with the 4f moments), the magnetic properties of these materials pose a challenging problem in their own right, especially when R is magnetic and M is nonmagnetic. For the interesting case of M = Co or Ni, Table I indicates that, for fixed R, the Co-based members exhibit collinear and equal-amplitude ferromagnetic (FM)/antiferromagnetic (AFM) structures; [9][10][11] by contrast, the Ni-based members exhibit a variety of modulated structures, few equal-amplitude and commensurate AFM structures, and an absence of FM modes. 12 Rhee et al 13 have calculated the generalized susceptibility for borocarbides from band structures obtained through the local-density approximation (LDA): for a fixed pair R and M , three incommensurate peaks were predicted near k 1 = (0.6, 0, 0), k 2 = (0, 0, 0.9) and k 3 = (0, 0, 0.3).…”

mentioning

confidence: 99%

“…Polycrystalline samples of Tb(Co x Ni 1−x ) 2 B 2 C (x = 0, 0.2, ..., 1) with 99.5% 11 B-enriched were prepared by the conventional arc-melt method; all samples were annealed for 20 hours at 1100 • C. Room-temperature conventional x-ray diffraction analysis of polycrystalline samples (not shown) indicated a single phase character for all compositions; the lattice parameters, as obtained from the Rietveld analysis, 16 are in excellent agreement with the reported values. 10,12,17,18 Powder neutrondiffractograms were collected at the high resolution powder diffractometer D2B of the Institut Laue-Langevin (ILL), France (λ = 1.6 Å, T = 1.5K and 30K), and were analyzed by the same Rietveld package. The diffractograms of the end members were not measured since these have already been determined.…”

mentioning

confidence: 99%

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Tuning in magnetic modes in Tb(CoxNi1−x)2B
ElMassalami
¹
,
Takeya
²
,
Ouladdiaf
³

et al. 2012
Phys. Rev. B
8
0
8
0
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Neutron diffraction and thermodynamics techniques were used to probe the evolution of the magnetic properties of Tb(CoxNi1−x)2B2C. A succession of magnetic modes was observed as x is varied: the longitudinal modulated k = (0.55, 0, 0) state at x = 0 is transformed into a collinear k = ( 1 /2, 0, 1 /2) antiferromagnetic state at x = 0.2, 0.4; then into a transverse c-axis modulated k = (0, 0, 1 /3) mode at x = 0.6, and finally into a simple ferromagnetic structure at x = 0.8 and 1. Concomitantly, the low-temperature orthorhombic distortion of the tetragonal unit cell at x = 0 is reduced smoothly such that for x ≥ 0.4 only a tetragonal unit cell is manifested. Though predicted theoretically earlier, this is the first observation of the k = (0, 0, 1 /3) mode in borocarbides; our findings of a succession of magnetic modes upon increasing x also find support from a recently proposed theoretical model. The implication of these findings and their interpretation on the magnetic structure of the RM2B2C series are also discussed.PACS numbers: 71.27.+a,75.25.+z, 75.50.Cc,75.30.Fv Rare-earth 4f moments at regular crystalline sites of intermetallic matrices are subjected to a variety of competing interactions, such as the Ruderman-KittelKasuya-Yosida (RKKY), crystalline electric field, magnetoelastic, and dipolar interactions.1,2 A particular class of such 4f intermetallics is the quaternary isomorphous borocarbides RM 2 B 2 C (R is a rare earth or Y, and M is a transition metal), which have been found to exhibit coexistence between superconductivity and magnetism for a judicious choice of R and M .3-8 Apart from the interesting issue of coexistence (which highlights the importance of electron interactions, with themselves as well as with the 4f moments), the magnetic properties of these materials pose a challenging problem in their own right, especially when R is magnetic and M is nonmagnetic. For the interesting case of M = Co or Ni, Table I indicates that, for fixed R, the Co-based members exhibit collinear and equal-amplitude ferromagnetic (FM)/antiferromagnetic (AFM) structures;9-11 by contrast, the Ni-based members exhibit a variety of modulated structures, few equal-amplitude and commensurate AFM structures, and an absence of FM modes. 12Rhee et al.13 have calculated the generalized susceptibility for borocarbides from band structures obtained through the local-density approximation (LDA): for a fixed pair R and M , three incommensurate peaks were predicted near k 1 = (0.6, 0, 0), k 2 = (0, 0, 0.9) and k 3 = (0, 0, 0.3). Though calculated for the nonmagnetic LuNi 2 B 2 C, the results were expected to be valid for all R, with the precise position and sharpness of each peak depending on R and M . Experimentally, both k 1 and k 2 modes show up in HoNi 2 B 2 C and, moreover, k 1 is evident in, for example, R = Er, Tb, Gd (Ref.12) but, so far, k 3 has not been observed in borocarbides. It is recalled that this model does not account for many modes [e.g. Ref. 13, the authors attributed this to the fact that their theory ...

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