Hydrostatic pressure effects and neutron diffraction studies of CeBi phase diagram

Bartholin, H.; Burlet, P.; Quézel, S.; Rossat‐Mignod, J.; Vogt, O.

doi:10.1051/jphyscol:1979547

Cited by 29 publications

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“…During the last two and a half decades, cerium monopnictides have attracted much interest due to their numerous striking properties. Besides the intensively discussed question of the two photoemission peaks with f character [1], we would like to cite here the reduction of the crystal field splitting of the 4f 1 state compared to the point charge model [2], the Kondo behavior of the resistivity [3], giant magneto-optical Kerr signals in CeSb [4,5], and the very complex magnetic phase diagram in the heavier cerium pnictides [6]. The cerium monopnictides crystallize in the rock-salt structure, and they are semimetals.…”

Section: (Received 29 November 1995)mentioning

confidence: 99%

“…The cerium monopnictides crystallize in the rock-salt structure, and they are semimetals. Systematic magnetization and neutron scattering investigations revealed nine magnetic phases in CeBi [6]. In zero magnetic field CeBi undergoes at 25.2 K a secondorder phase transition to an antiferromagnetic phase with a type I structure ͑1 2 12͒.…”

Section: (Received 29 November 1995)mentioning

confidence: 99%

“…The main phase is a ferrimagnetic phase with (001) planes stacked in the sequence 1 1 12. At low temperatures a transition to a spin-aligned phase occurs at 4.7 T [6].…”

Section: (Received 29 November 1995)mentioning

confidence: 99%

“…3). In the antiferromagnetic phase with spin arrangement 1 2 12, present in CeBi in zero field at temperatures between 13 and 25 K [6], two strong new structures develop at 0.29 and 0.49 eV [full line in Fig. 3(a)].…”

Section: (Received 29 November 1995)mentioning

confidence: 99%

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Periodicity of the Spin Structure Observed in the Optical Response of CeBi Single Crystals

Pittini¹,

Schoenes

Hulliger³

et al. 1996

Phys. Rev. Lett.

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We report a study of the optical conductivity of CeBi in different magnetic phases. Going from the paramagnetic phase to the various antiferromagnetic and ferrimagnetic phases, different new interband transitions appear below the absorption edge of the p ! d transitions. These new interband transitions disappear in a magnetic field that is sufficiently strong to align the spins parallel. The appearance of new interband transitions is indubitably associated with the folding of the Brillouin zone, which is a consequence of the change of the periodicity of the spin structure. [S0031-9007(96)00072-5] PACS numbers: 78.20.Ci, 75.25.+z, 75.50.Ee, 75.50.Gg During the last two and a half decades, cerium monopnictides have attracted much interest due to their numerous striking properties. Besides the intensively discussed question of the two photoemission peaks with f character [1], we would like to cite here the reduction of the crystal field splitting of the 4f 1 state compared to the point charge model [2], the Kondo behavior of the resistivity [3], giant magneto-optical Kerr signals in CeSb [4,5], and the very complex magnetic phase diagram in the heavier cerium pnictides [6]. The cerium monopnictides crystallize in the rock-salt structure, and they are semimetals. Systematic magnetization and neutron scattering investigations revealed nine magnetic phases in CeBi [6]. In zero magnetic field CeBi undergoes at 25.2 K a secondorder phase transition to an antiferromagnetic phase with a type I structure ͑1 2 12͒. At 13 K CeBi shows a firstorder phase transition to a type IA phase with the periodicity 1 1 22. In a magnetic field applied along [001], several ferrimagnetic structures appear. The main phase is a ferrimagnetic phase with (001) planes stacked in the sequence 1 1 12. At low temperatures a transition to a spin-aligned phase occurs at 4.7 T [6].First, optical reflectivity measurements on CeSb were reported by Schoenes and Reim [7] and Reim et al. [4]. These room temperature measurements gave evidence for one interband transition in CeSb at 0.4 eV, which was attributed to an f ! d transition. Later Kwon et al. [8] reported reflectivity measurements for CeSb and CeBi, including low temperature data. The latter showed the appearance of two structures in the infrared optical conductivity, but the origin of these features could not be definitely clarified. In this Letter, we report a detailed study of the infrared properties of CeBi as a function of temperature and magnetic field. The variation of these two external parameters allowed us to switch between several magnetic phases of CeBi and to observe the corresponding variations in the infrared optical conductivity. The optical response of CeBi reacted distinctly according to all changes of the periodicity of the magnetic structure. This is, to our knowledge, the first direct observation of the relation between the periodicity of the spin structure and the optical conductivity of a material in two antiferromagnetic phases, as well as in a ferrimagnetic phase and in ...

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Section: (Received 29 November 1995)mentioning

confidence: 99%

Section: (Received 29 November 1995)mentioning

confidence: 99%

“…The main phase is a ferrimagnetic phase with (001) planes stacked in the sequence 1 1 12. At low temperatures a transition to a spin-aligned phase occurs at 4.7 T [6].…”

Section: (Received 29 November 1995)mentioning

confidence: 99%

Section: (Received 29 November 1995)mentioning

confidence: 99%

See 2 more Smart Citations

Periodicity of the Spin Structure Observed in the Optical Response of CeBi Single Crystals

Pittini¹,

Schoenes

Hulliger³

et al. 1996

Phys. Rev. Lett.

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“…Many types of stacking sequences appear in the phase diagram. Among CeX p 's, CeSb 3) and CeBi 4,5) have the type-IA antiferromagnetic (+ + −−) phase with nearly full (J z ≃ ±5/2) magnetic moment as the ground state of weak H case. Here '+' denotes the ferromagnetic layer with the magnetic moment parallel to the field, and '−' denotes the layer anti-parallel to the field.…”

Section: §1 Introductionmentioning

confidence: 99%

Theory on the Stability of the Ferromagnetic Double Layer Structure and on the Peak Structure of the Magneto-Optical Spectra of CeSb

Ishiyama

Sakai

2003

J. Phys. Soc. Jpn.

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We propose the pf +pd mixing model for CeSb to explain the stability of the ferromagnetic double layer structure in the magnetic ordering. The pd mixing causes the saddle type singular points, neighboring the ∆ axis, for the bands which gain energy through the pf hybridization with the occupied f state. The peak of the density of states due to this combined effect of the pf mixing and the pd mixing enhances the stability of the double layer structure. The same combined effect also causes the saddle type singular points in the joint density of states of the optical transition. The peak structure of the magneto-optical spectra which has been observed in experiments is explained by the present model.KEYWORDS: CeSb, magnetic order, double layer structure, optical conductivity, pf mixing model §1. Introduction Cerium monopnictides (CeX p , X p =P, As, Sb, Bi) are semimetals with the NaCl type lattice. Their electronic bands have hole surfaces originated from atomic X p p states around Γ, and electron surfaces originated from Ce 5d states around three equivalent X.1) In the temperature (T) and the magnetic field (H) diagram, 2, 3) CeX p 's show various types of magnetic ordered states. They consist of the ferromagnetic layers which stack antiferromagnetically. Many types of stacking sequences appear in the phase diagram. Among CeX p 's, CeSb 3) and CeBi 4, 5) have the type-IA antiferromagnetic (+ + −−) phase with nearly full (J z ≃ ±5/2) magnetic moment as the ground state of weak H case. Here '+' denotes the ferromagnetic layer with the magnetic moment parallel to the field, and '−' denotes the layer anti-parallel to the field.The pair of ferromagnetic layers (++ or −−) is widely observed as a unit of the magnetic structure in CeX p 's. We call it as the 'double layer structure', hereafter.The phase diagram of CeSb has been qualitatively reproduced by the ANNNI model.6-8) However, it is not clear how the parameters of the phenomenological model are related to those of the microscopic model.The origin of the ferromagnetic layer with nearly full moment was explained by the pf mixing model 9-16) proposed by Kasuya et al. The model also succeeded in explaining the origin of the antiferromagnetic stacking of the ferromagnetic layers. However, the stability of the double layer structure with sufficient energy gain has not been obtained.The pd mixing term between X p p bands and Ce d bands is neglected in the energy calculation of the original pf mixing model, because the pd mixing effect dis- * Contact address: NTT Energy and Environment Systems Laboratories, Tokyo 180-8585 appears on the ∆ axis where the pf mixing becomes maximum. Later, it was pointed out that the pd mixing term plays important role [17][18][19] to explain the Fermi surfaces of CeSb in the ferromagnetic phase [20][21][22][23][24][25] and + + − phase. 25, 26)In this paper, we employ the pf mixing model including the pd mixing effect, and examine the stability of the double layer structure in CeSb. Hereafter, we call the model as the pf +pd mixing model. I...

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LaN - TbSb

Grünberg¹,

Maletta²

Landolt-Börnstein - Group III Condensed Matter

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Hydrostatic pressure effects and neutron diffraction studies of CeBi phase diagram

Abstract: The phase diagram of CeBi for a magnetic field applied along a 〈 100 〉 axis has been determined by magnetization experiments and neutron diffraction scattering. Some of the seven observed magnetic phases disappear under pressure

Cited by 29 publications

References 0 publications

Periodicity of the Spin Structure Observed in the Optical Response of CeBi Single Crystals

Periodicity of the Spin Structure Observed in the Optical Response of CeBi Single Crystals

Theory on the Stability of the Ferromagnetic Double Layer Structure and on the Peak Structure of the Magneto-Optical Spectra of CeSb

LaN - TbSb

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