Magnetocaloric and barocaloric responses in magnetovolumic systems

Mendive-Tapia, Eduardo; Castán, Teresa

doi:10.1103/physrevb.91.224421

Cited by 14 publications

(19 citation statements)

References 63 publications

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“…These values are significantly larger than those reported (or estimated) for other barocaloric materials [13,[21][22][23][24]. It is also worth noting that upon pressure cycling |∆T | remain at a relative large value of ∼ 4 K over a temperature span of ∼ 10 K. Recently, the magnetocaloric and barocaloric effects in caloric materials have been studied by means of a meanfield model which includes magnetovolumic effects [11]. The model has been applied to the specific case of FeRh and the predicted adiabatic temperature changes are in qualitative agreement with present experimental data.…”

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confidence: 83%

“…In the recent years, however, there has been a renewed interest in the study of Fe-Rh [5][6][7][8][9][10][11]. On the one hand, it has been evidenced that in accurately prepared samples, the entropy change associated with the magnetocaloric effect exhibits good reproducibility upon magnetic field cycling [10,12].…”

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confidence: 99%

“…The strong sensitivity of the transition temperature to the external fields (magnetic and mechanical) confer to this alloy outstanding magnetocaloric and barocaloric strengths in comparison to other materials [13] which make it particularly interesting for cooling applications at low fields. It is also worth mentioning that understanding the strong coupling between several degrees of freedom (magnetic, structural and electronic) represents a challenge from a fundamental point of view [5,7,9,11].…”

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confidence: 99%

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Reversible adiabatic temperature changes at the magnetocaloric and barocaloric effects in Fe49Rh51

Stern‐Taulats

Gràcia-Condal

Planes

et al. 2015

Applied Physics Letters

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We report on the adiabatic temperature changes (ΔT) associated with the magnetocaloric and barocaloric effects in a Fe49Rh51 alloy. For the magnetocaloric effect, data derived from entropy curves are compared to direct thermometry measurements. The agreement between the two sets of data provides support to the estimation of ΔT for the barocaloric effect, which are indirectly determined from entropy curves. Large ΔT values are obtained at relatively low values of magnetic field (2 T) and hydrostatic pressure (2.5 kbar). It is also shown that both magnetocaloric and barocaloric effects exhibit good reproducibility upon magnetic field and hydrostatic pressure cycling, over a considerable temperature range.

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confidence: 83%

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confidence: 99%

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confidence: 99%

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Reversible adiabatic temperature changes at the magnetocaloric and barocaloric effects in Fe49Rh51

Stern‐Taulats

Gràcia-Condal

Planes

et al. 2015

Applied Physics Letters

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“…49 As we are interested in the calculation of the adiabatic temperature change ∆T ad the incorporation of the lattice vibrations acting as a thermal bath (or reservoir) is fundamental to avoid unphysical results. 50 We have consequently implemented a standard simple Debye model for the vibrational entropy…”

Section: Calculation Of Caloric Responsesmentioning

confidence: 99%

Frustrated magnetism and caloric effects in Mn-based antiperovskite nitrides: Ab initio theory

et al. 2017

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Copyright and reuse:The Warwick Research Archive Portal (WRAP) makes this work by researchers of the University of Warwick available open access under the following conditions. Copyright © and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable the material made available in WRAP has been checked for eligibility before being made available.Copies of full items can be used for personal research or study, educational, or not-for-profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. Publisher statement: © 2017 American Physical Society A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP URL' above for details on accessing the published version and note that access may require a subscription. We model changes of magnetic ordering in Mn-antiperovskite nitrides driven by biaxial lattice strain at zero and at finite temperature. We employ a non-collinear spin-polarised density functional theory to compare the response of the geometrically frustrated exchange interactions to a tetragonal symmetry breaking (the so called piezomagnetic effect) across a range of Mn3AN (A = Rh, Pd, Ag, Co, Ni, Zn, Ga, In, Sn) at zero temperature. Building on the robustness of the effect we focus on Mn3GaN and extend our study to finite temperature using the disordered local moment (DLM) first-principles electronic structure theory to model the interplay between the ordering of Mn magnetic moments and itinerant electron states. We discover a rich temperature-strain magnetic phase diagram with two previously unreported phases stabilised by strains larger than 0.75% and with transition temperatures strongly dependent on strain. We propose an elastocaloric cooling cycle crossing two of the available phase transitions to achieve simultaneously a large isothermal entropy change (due to the first order transition) and a large adiabatic temperature change (due to the second order transition).

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“…1 proved the magnetocrystalline anisotropy to be the microscopic mechanism responsible for the weak ferromagnetic (WF) distortion, whereas the Dzyaloshinsky-Moriya (DM) interaction 12,13 was shown to lift the chiral degeneracy of the Γ 3 and Γ 5 states. The electronic and magnetic structure of these compounds was also investigated theoretically in terms of self-consistent field density functional calculations in the local density approximation (LDA) 4,10,11,14,15 . In the hexagonal phase, the chiral Γ 5 state with a weak fer- romagnetic (WF) distortion and a small net magnetic moment was found as ground state 4,10,15 .…”

Section: Introductionmentioning

confidence: 99%

Weak ferromagnetism in hexagonal Mn3Z alloys (Z=Sn,Ge,Ga)

2019

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We present combined spin model and first principles electronic structure calculations to study the weak ferromagnetism in bulk Mn 3 Z (Z=Sn, Ge, Ga) compounds. The spin model parameters were determined from a spin-cluster expansion technique based on the relativistic disordered local moment formalism implemented in the screened Korringa-Kohn-Rostoker method. We describe the magnetic ground state of the system within a three-sublattice model and investigate the formation of the weak ferromagnetic states in terms of the relevant model parameters. First, we give a group-theoretical argument how the point-group symmetry of the lattice leads to the formation of weak ferromagnetic states. Then we study the ground states of the classical spin model and derive analytical expressions for the weak ferromagnetic distortions by recovering the main results of the group-theoretical analysis. As a third approach we obtain the weak ferromagnetic ground states from self-consistent density functional calculations and compare our results with previous first principles calculations and with available experimental data. In particular, we demonstrate that the orbital moments follow a decomposition predicted by group theory. For a deeper understanding of the formation of weak ferromagnetism we selectively trace the effect of the spin-orbit coupling at the Mn and Z sites. In addition, for the case of Mn 3 Ga, we gain information on the role of the induced moment of Ga from constrained local density functional calculations.

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Magnetocaloric and barocaloric responses in magnetovolumic systems

Cited by 14 publications

References 63 publications

Reversible adiabatic temperature changes at the magnetocaloric and barocaloric effects in Fe49Rh51

Reversible adiabatic temperature changes at the magnetocaloric and barocaloric effects in Fe49Rh51

Frustrated magnetism and caloric effects in Mn-based antiperovskite nitrides: Ab initio theory

Weak ferromagnetism in hexagonal Mn3Z alloys (Z=Sn,Ge,Ga)

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