Tailoring the magnetism of Tb 5Si 2Ge 2 compounds by la substitution

J. H. Belo; A. M. Pereira; J. P. Araújo; C. De La Cruz; A. M. Dos Santos; J. N. Gonçalves; V. S. Amaral; L. Morellon; M. R. Ibarra; P. A. Algarabel; C. Magen

doi:10.1103/PhysRevB.86.014403

Tailoring the magnetism of Tb ₅Si ₂Ge ₂ compounds by la substitution

J. H. Belo, A. M. Pereira, J. P. Araújo, C. De La Cruz, A. M. Dos Santos, J. N. Gonçalves, V. S. Amaral, L. Morellon, M. R. Ibarra, P. A. Algarabel, C. Magen

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Abstract

In order to study the crystal structure, phase relationships, and magnetic properties of the system Tb _5-xLa _xSi ₂Ge ₂, a series of polycrystalline samples with compositions ranging from x=0 to x=5 have been synthesized and characterized in detail. At room temperature, two structures have been detected: Compounds in the concentration range 0≤x<1 present a monoclinic Gd ₅Si ₂Ge ₂-type structure, while for x1 a tetragonal Zr ₅Si ₄-type structure is observed. The unit cell volume increases linearly with La concentration but with two different slopes: ∼18 Å3/x and ∼33 Å3/x for 0≤x<1 (monoclinic) and x1 (tetragonal), respectively. In the monoclinic region, an increase of T _C was observed, reaching a maximum value of T _C ∼154 K, at the x=0.75 composition. This feature is explained based on specific La occupancy at the R2 site which was supported by density functional calculations for low La concentration. The samples that crystallized in the tetragonal structure exhibit a linear decrease of T _C(x) with a slope of ∂T _C/∂x ∼-38 K/x, reaching 0 K for the x=5 composition. A magnetic and structural x-T phase diagram of the Tb _5-xLa _xSi ₂Ge ₂ system in the temperature range 4-300 K is proposed.

Original language	English
Article number	014403
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	86
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.86.014403
State	Published - Jul 5 2012

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Belo, J. H., Pereira, A. M., Araújo, J. P., De La Cruz, C., Dos Santos, A. M., Gonçalves, J. N., Amaral, V. S., Morellon, L., Ibarra, M. R., Algarabel, P. A., & Magen, C. (2012). Tailoring the magnetism of Tb ₅Si ₂Ge ₂ compounds by la substitution. Physical Review B - Condensed Matter and Materials Physics, 86(1), Article 014403. https://doi.org/10.1103/PhysRevB.86.014403

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title = "Tailoring the magnetism of Tb 5Si 2Ge 2 compounds by la substitution",

abstract = "In order to study the crystal structure, phase relationships, and magnetic properties of the system Tb 5-xLa xSi 2Ge 2, a series of polycrystalline samples with compositions ranging from x=0 to x=5 have been synthesized and characterized in detail. At room temperature, two structures have been detected: Compounds in the concentration range 0≤x<1 present a monoclinic Gd 5Si 2Ge 2-type structure, while for x1 a tetragonal Zr 5Si 4-type structure is observed. The unit cell volume increases linearly with La concentration but with two different slopes: ∼18 {\AA}3/x and ∼33 {\AA}3/x for 0≤x<1 (monoclinic) and x1 (tetragonal), respectively. In the monoclinic region, an increase of T C was observed, reaching a maximum value of T C ∼154 K, at the x=0.75 composition. This feature is explained based on specific La occupancy at the R2 site which was supported by density functional calculations for low La concentration. The samples that crystallized in the tetragonal structure exhibit a linear decrease of T C(x) with a slope of ∂T C/∂x ∼-38 K/x, reaching 0 K for the x=5 composition. A magnetic and structural x-T phase diagram of the Tb 5-xLa xSi 2Ge 2 system in the temperature range 4-300 K is proposed.",

author = "Belo, {J. H.} and Pereira, {A. M.} and Ara{\'u}jo, {J. P.} and {De La Cruz}, C. and {Dos Santos}, {A. M.} and Gon{\c c}alves, {J. N.} and Amaral, {V. S.} and L. Morellon and Ibarra, {M. R.} and Algarabel, {P. A.} and C. Magen",

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doi = "10.1103/PhysRevB.86.014403",

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AU - Belo, J. H.

AU - Pereira, A. M.

AU - Araújo, J. P.

AU - De La Cruz, C.

AU - Dos Santos, A. M.

AU - Gonçalves, J. N.

AU - Amaral, V. S.

AU - Morellon, L.

AU - Ibarra, M. R.

AU - Algarabel, P. A.

AU - Magen, C.

PY - 2012/7/5

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N2 - In order to study the crystal structure, phase relationships, and magnetic properties of the system Tb 5-xLa xSi 2Ge 2, a series of polycrystalline samples with compositions ranging from x=0 to x=5 have been synthesized and characterized in detail. At room temperature, two structures have been detected: Compounds in the concentration range 0≤x<1 present a monoclinic Gd 5Si 2Ge 2-type structure, while for x1 a tetragonal Zr 5Si 4-type structure is observed. The unit cell volume increases linearly with La concentration but with two different slopes: ∼18 Å3/x and ∼33 Å3/x for 0≤x<1 (monoclinic) and x1 (tetragonal), respectively. In the monoclinic region, an increase of T C was observed, reaching a maximum value of T C ∼154 K, at the x=0.75 composition. This feature is explained based on specific La occupancy at the R2 site which was supported by density functional calculations for low La concentration. The samples that crystallized in the tetragonal structure exhibit a linear decrease of T C(x) with a slope of ∂T C/∂x ∼-38 K/x, reaching 0 K for the x=5 composition. A magnetic and structural x-T phase diagram of the Tb 5-xLa xSi 2Ge 2 system in the temperature range 4-300 K is proposed.

AB - In order to study the crystal structure, phase relationships, and magnetic properties of the system Tb 5-xLa xSi 2Ge 2, a series of polycrystalline samples with compositions ranging from x=0 to x=5 have been synthesized and characterized in detail. At room temperature, two structures have been detected: Compounds in the concentration range 0≤x<1 present a monoclinic Gd 5Si 2Ge 2-type structure, while for x1 a tetragonal Zr 5Si 4-type structure is observed. The unit cell volume increases linearly with La concentration but with two different slopes: ∼18 Å3/x and ∼33 Å3/x for 0≤x<1 (monoclinic) and x1 (tetragonal), respectively. In the monoclinic region, an increase of T C was observed, reaching a maximum value of T C ∼154 K, at the x=0.75 composition. This feature is explained based on specific La occupancy at the R2 site which was supported by density functional calculations for low La concentration. The samples that crystallized in the tetragonal structure exhibit a linear decrease of T C(x) with a slope of ∂T C/∂x ∼-38 K/x, reaching 0 K for the x=5 composition. A magnetic and structural x-T phase diagram of the Tb 5-xLa xSi 2Ge 2 system in the temperature range 4-300 K is proposed.

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Tailoring the magnetism of Tb ₅Si ₂Ge ₂ compounds by la substitution

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