Experimental study of the rotational magnetocaloric effect in KTm(MoO 4 ) 2

Tarasenko, R.; Tkáč, V.; Orendáčová, A.; Orendáč, M.; Feher, A.

doi:10.1016/j.physb.2018.03.027

Cited by 19 publications

(7 citation statements)

References 28 publications

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“…The RCR values in 5 and 7 T were estimated as 142 and 138 J/kg, respectively. The result is comparable with RCR ≈ 170 J/kg in 5 T, estimated in the single crystalline KTm(MoO4)2 for the orientations between a and b axes [13].…”

Section: Resultssupporting

confidence: 84%

“…7(b)), at 2 K varies linearly to 30° followed by a sudden increase to 45°, and changes negligibly above 45°. The maximum was evaluated to be 20.5 J/kg·K, comparable with the value observed at 5 T. Upon increasing T, the maximum progressively reduces to 18.5, 11.4, and 9.2 J/kg·K, respectively, for 5, 10, and 15 K. To check the potential of our TCMO as magnetic cryo-refrigerant using rotation, we have also calculated rotational refrigerant capacity (RCR) [13,37] between the two anisotropic orientations. The RCR values in 5 and 7 T were estimated as 142 and 138 J/kg, respectively.…”

Section: Resultssupporting

confidence: 56%

“…[11] ( = 12.4 J/kg•K for 7 T at 10 K), TmFeO3 [12] ( = 9.0 J/kg•K for 5 T at 17 K), KTm(MoO4)2 [13] ( = 9.8 J/kg•K for 5 T at 10 K), and KEr(MoO4)2 [14] ( = 13 J/kg•K for 5 T at 10 K). The exploitation of insulating oxides provides advantages, including easy manufacturability and strong stability, and prevents inefficiency due to eddy current.…”

Section: Introductionmentioning

confidence: 99%

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Anisotropic magnetic properties and giant rotating magnetocaloric effect in double-perovskite Tb2CoMnO6

Moon

Kim

et al. 2018

Phys. Rev. B

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We investigated the anisotropy of the magnetic and magnetocaloric properties of singlecrystalline double perovskite Tb2CoMnO6, which crystallizes in a monoclinic P21/n structure. Due to dissimilar magnetic anisotropy, the ferromagnetic order of the Co 2+ and Mn 4+ moments emerges along the c-axis at TC = 100 K, and the larger Tb 3+ moments align perpendicular to the c-axis, below TTb = 15 K. The intricate temperature development of the metamagnetism along the c-axis results in a large negative change in the magnetic entropy at low temperature. On the other hand, the larger but almost reversible magnetization, perpendicular to the c-axis, results in a small and positive entropy change. This highly anisotropic magnetocaloric effect (MCE) leads to a giant rotational MCE, estimated to be 20.8 J/kg·K. Our findings, based on the magnetic anisotropy in Tb2CoMnO6, enrich fundamental and applied research on magnetic materials, considering the distinct magnetic characteristics of double perovskites. * Electronic addresses: phylove@yonsei.ac.kr and eland@yonsei.ac.kr

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Section: Resultssupporting

confidence: 84%

Section: Resultssupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

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Anisotropic magnetic properties and giant rotating magnetocaloric effect in double-perovskite Tb2CoMnO6

Moon

Kim

et al. 2018

Phys. Rev. B

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“…The quantum part is related to the quantum nature of the working substance where the energy spectrum was used to get the classical partition function and used it to analyze the classical adiabatic strokes. We emphasize that the MCE has been studied at systems where considerations like the used in this work reproduce experimental observations in good agreement with the classical theory [52].…”

Section: Magnetocaloric Observablessupporting

confidence: 63%

Magnetocaloric Effect in an Antidot : The Effect of the Aharonov-Bohm Flux and Antidot Radius

Negrete

Peña

Vargas

2018

Preprint

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In this work, we report the magnetocaloric effect (MCE) in a quantum dot corresponding to an electron interacting with an antidot, under the effect of an Aharonov-Bohm flux subjected to a parabolic confinement potential. We use the Bogachek and Landman model, which additionally allows the study of quantum dots with Fock-Darwin energy levels for vanishing antidot radius and flux. We find that the Aharonov-Bohm flux (AB-flux) strongly controls the oscillatory behaviour of the MCE, thus acting as a control parameter for the cooling or heating of the magnetocaloric effect. We propose a way to detect AB-flux by measuring temperature differences.

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“…A practical reason for this approach is given by the fact that mechanical rotations of the sample can be performed much more quickly than field sweeps. However, the rotational magnetocaloric effect (rMCE) requires anisotropic magnetic materials [20,21]. In this article we therefore discuss how single-molecule magnets (SMM) perform as cooling agents in the kelvin temperature region.…”

Section: Introductionmentioning

confidence: 99%

Rotational magnetocaloric effect of anisotropic giant-spin molecular magnets

Beckmann

Ehrens

Schnack

2019

Journal of Magnetism and Magnetic Materials

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The magnetocaloric effect, that consists of adiabatic temperature changes in a varying external magnetic field, appears not only when the amplitude is changed, but in cases of anisotropic magnetic materials also when the direction is varied. In this article we investigate the magnetocaloric effect theoretically for the archetypical single molecule magnets Fe 8 and Mn 12 that are rotated with respect to a magnetic field. We complement our calculations for equilibrium situations with investigations of the influence of non-equilibrium thermodynamic cycles.

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Experimental study of the rotational magnetocaloric effect in KTm(MoO 4 ) 2

Cited by 19 publications

References 28 publications

Anisotropic magnetic properties and giant rotating magnetocaloric effect in double-perovskite Tb2CoMnO6

Anisotropic magnetic properties and giant rotating magnetocaloric effect in double-perovskite Tb2CoMnO6

Magnetocaloric Effect in an Antidot : The Effect of the Aharonov-Bohm Flux and Antidot Radius

Rotational magnetocaloric effect of anisotropic giant-spin molecular magnets

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