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

1 Scopus citations

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",

issn = "0921-4526",

publisher = "Elsevier",

}

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

UR - https://www.scopus.com/pages/publications/85014617401

U2 - 10.1016/j.physb.2017.03.009

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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