Insights on the origin of the Tb5Ge4 magnetocaloric effect

J. H. Belo; M. B. Barbosa; A. L. Pires; R. M. Costa; J. G.V. Teixeira; J. Silva; P. A. Algarabel; C. Magen; L. Morellon; J. S. Amaral; U. Zeitler; G. Veerendra; A. M. dos Santos; Y. Ren; M. R. Ibarra; J. P. Araújo; A. M. Pereira

doi:10.1016/j.physb.2017.03.009

Insights on the origin of the Tb₅Ge₄ magnetocaloric effect

J. H. Belo, M. B. Barbosa, A. L. Pires, R. M. Costa, J. G.V. Teixeira, J. Silva, P. A. Algarabel, C. Magen, L. Morellon, J. S. Amaral, U. Zeitler, G. Veerendra, A. M. dos Santos, Y. Ren, M. R. Ibarra, J. P. Araújo, A. M. Pereira

Research output: Contribution to journal › Article › peer-review

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Abstract

In this report the magnetic, atomic structures and spin-lattice coupling have been thoroughly studied through high magnetic field magnetometry, Synchrotron X-ray diffraction under applied magnetic field and magnetostriction measurements in the Tb₅Ge₄ compounds. A field induced phase transition from an antiferromagnetic towards a ferromagnetic ordering was confirmed but with absence of structural transformation. This absence has been confirmed experimentally through synchrotron x-ray diffraction under applied field (up to 30 T). Moreover, this absence was explained via a thermodynamic free energy model: first principles calculations determined a large energy gap (ΔE=0.65 eV) between the two possible structures, O(I) and O(II). From magnetic and structural properties, a H-T phase diagram has been proposed for Tb₅Ge₄. Finally it was observed a large magnetostriction (up to 600 ppm) induced by ∆H=7 T.

Original language	English
Pages (from-to)	72-76
Number of pages	5
Journal	Physica B: Physics of Condensed Matter
Volume	513
DOIs	https://doi.org/10.1016/j.physb.2017.03.009
State	Published - May 15 2017
Externally published	Yes

Keywords

Magnetic phase transitions
Magnetocaloric effect
Phase diagram
Structure of crystalline solids

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10.1016/j.physb.2017.03.009

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Belo, J. H., Barbosa, M. B., Pires, A. L., Costa, R. M., Teixeira, J. G. V., Silva, J., Algarabel, P. A., Magen, C., Morellon, L., Amaral, J. S., Zeitler, U., Veerendra, G., dos Santos, A. M., Ren, Y., Ibarra, M. R., Araújo, J. P., & Pereira, A. M. (2017). Insights on the origin of the Tb₅Ge₄ magnetocaloric effect. Physica B: Physics of Condensed Matter, 513, 72-76. https://doi.org/10.1016/j.physb.2017.03.009

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title = "Insights on the origin of the Tb5Ge4 magnetocaloric effect",

abstract = "In this report the magnetic, atomic structures and spin-lattice coupling have been thoroughly studied through high magnetic field magnetometry, Synchrotron X-ray diffraction under applied magnetic field and magnetostriction measurements in the Tb5Ge4 compounds. A field induced phase transition from an antiferromagnetic towards a ferromagnetic ordering was confirmed but with absence of structural transformation. This absence has been confirmed experimentally through synchrotron x-ray diffraction under applied field (up to 30 T). Moreover, this absence was explained via a thermodynamic free energy model: first principles calculations determined a large energy gap (ΔE=0.65 eV) between the two possible structures, O(I) and O(II). From magnetic and structural properties, a H-T phase diagram has been proposed for Tb5Ge4. Finally it was observed a large magnetostriction (up to 600 ppm) induced by ∆H=7 T.",

keywords = "Magnetic phase transitions, Magnetocaloric effect, Phase diagram, Structure of crystalline solids",

author = "Belo, {J. H.} and Barbosa, {M. B.} and Pires, {A. L.} and Costa, {R. M.} and Teixeira, {J. G.V.} and J. Silva and Algarabel, {P. A.} and C. Magen and L. Morellon and Amaral, {J. S.} and U. Zeitler and G. Veerendra and {dos Santos}, {A. M.} and Y. Ren and Ibarra, {M. R.} and Ara{\'u}jo, {J. P.} and Pereira, {A. M.}",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

year = "2017",

month = may,

day = "15",

doi = "10.1016/j.physb.2017.03.009",

language = "English",

volume = "513",

pages = "72--76",

journal = "Physica B: Physics of Condensed Matter",

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Belo, JH, Barbosa, MB, Pires, AL, Costa, RM, Teixeira, JGV, Silva, J, Algarabel, PA, Magen, C, Morellon, L, Amaral, JS, Zeitler, U, Veerendra, G, dos Santos, AM, Ren, Y, Ibarra, MR, Araújo, JP & Pereira, AM 2017, 'Insights on the origin of the Tb₅Ge₄ magnetocaloric effect', Physica B: Physics of Condensed Matter, vol. 513, pp. 72-76. https://doi.org/10.1016/j.physb.2017.03.009

TY - JOUR

T1 - Insights on the origin of the Tb5Ge4 magnetocaloric effect

AU - Belo, J. H.

AU - Barbosa, M. B.

AU - Pires, A. L.

AU - Costa, R. M.

AU - Teixeira, J. G.V.

AU - Silva, J.

AU - Algarabel, P. A.

AU - Magen, C.

AU - Morellon, L.

AU - Amaral, J. S.

AU - Zeitler, U.

AU - Veerendra, G.

AU - dos Santos, A. M.

AU - Ren, Y.

AU - Ibarra, M. R.

AU - Araújo, J. P.

AU - Pereira, A. M.

PY - 2017/5/15

Y1 - 2017/5/15

N2 - In this report the magnetic, atomic structures and spin-lattice coupling have been thoroughly studied through high magnetic field magnetometry, Synchrotron X-ray diffraction under applied magnetic field and magnetostriction measurements in the Tb5Ge4 compounds. A field induced phase transition from an antiferromagnetic towards a ferromagnetic ordering was confirmed but with absence of structural transformation. This absence has been confirmed experimentally through synchrotron x-ray diffraction under applied field (up to 30 T). Moreover, this absence was explained via a thermodynamic free energy model: first principles calculations determined a large energy gap (ΔE=0.65 eV) between the two possible structures, O(I) and O(II). From magnetic and structural properties, a H-T phase diagram has been proposed for Tb5Ge4. Finally it was observed a large magnetostriction (up to 600 ppm) induced by ∆H=7 T.

AB - In this report the magnetic, atomic structures and spin-lattice coupling have been thoroughly studied through high magnetic field magnetometry, Synchrotron X-ray diffraction under applied magnetic field and magnetostriction measurements in the Tb5Ge4 compounds. A field induced phase transition from an antiferromagnetic towards a ferromagnetic ordering was confirmed but with absence of structural transformation. This absence has been confirmed experimentally through synchrotron x-ray diffraction under applied field (up to 30 T). Moreover, this absence was explained via a thermodynamic free energy model: first principles calculations determined a large energy gap (ΔE=0.65 eV) between the two possible structures, O(I) and O(II). From magnetic and structural properties, a H-T phase diagram has been proposed for Tb5Ge4. Finally it was observed a large magnetostriction (up to 600 ppm) induced by ∆H=7 T.

KW - Magnetic phase transitions

KW - Magnetocaloric effect

KW - Phase diagram

KW - Structure of crystalline solids

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DO - 10.1016/j.physb.2017.03.009

M3 - Article

AN - SCOPUS:85014617401

SN - 0921-4526

VL - 513

SP - 72

EP - 76

JO - Physica B: Physics of Condensed Matter

JF - Physica B: Physics of Condensed Matter

ER -

Insights on the origin of the Tb₅Ge₄ magnetocaloric effect

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Keywords

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