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: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

1 Citation (Scopus)

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
Journal	Physica B: Condensed Matter
Volume	513
DOIs	https://doi.org/10.1016/j.physb.2017.03.009
Publication status	Published - 15 May 2017
Externally published	Yes

Bibliographical note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Research Keywords

Magnetic phase transitions
Magnetocaloric effect
Phase diagram
Structure of crystalline solids

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10.1016/j.physb.2017.03.009

https://www.sciencedirect.com/science/article/am/pii/S0921452617301114

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Cite this

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: 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.\}",

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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.

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

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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UR - https://www.scopus.com/pages/publications/85014617401#tab=impact

U2 - 10.1016/j.physb.2017.03.009

DO - 10.1016/j.physb.2017.03.009

M3 - RGC 21 - Publication in refereed journal

SN - 0921-4526

VL - 513

SP - 72

EP - 76

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

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