Rotational magnetocaloric effect of anisotropic giant-spin molecular magnets

Beckmann, Christian F.; Ehrens, Julian; Schnack, Jürgen

doi:10.1016/j.jmmm.2019.02.064

Cited by 14 publications

(6 citation statements)

References 38 publications

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“…Another interesting route is utilizing the quantum level crossings [33]. In addition, such ideas as rotational MCE exploiting strong magnetic anisotropy [34,35] are investigated in molecular systems. These facts strongly motivate the interest in magnetocaloric properties of molecular magnets.…”

Section: Introductionmentioning

confidence: 99%

Magnetocaloric Effect in Cu5-NIPA Molecular Magnet: A Theoretical Study

Szałowski

Kowalewska

2020

Materials

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We calculated the magnetocaloric properties of the molecular nanomagnet Cu5-NIPA, consisting of five spins S = 1 / 2 arranged in two corner-sharing triangles (hourglass-like structure without magnetic frustration). The thermodynamics of the system in question was described using the quantum Heisenberg model solved within the field ensemble (canonical ensemble) using exact numerical diagonalization. The dependence of the magnetic entropy and magnetic specific heat on the temperature and the external magnetic field was investigated. The isothermal entropy change for a wide range of initial and final magnetic fields was discussed. Due to plateau-like behavior of the isothermal entropy change as a function of the temperature, a high degree of tunability of magnetocaloric effect with the initial and final magnetic field was demonstrated.

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Section: Introductionmentioning

confidence: 99%

Magnetocaloric Effect in Cu5-NIPA Molecular Magnet: A Theoretical Study

Szałowski

Kowalewska

2020

Materials

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“…Significant interest was devoted to the potentially viable LaFe 13−x Si x [137,200,284,288,290,292], doped with Co [249] and other additives [35], or partially hydrated [52][53][54][55]. For completeness, we mention Mn 3 CuN 1−x C x [147] and molecular magnets [128].…”

Section: ∆S T T C (K) ∆T S (K)mentioning

confidence: 99%

Viable Materials with a Giant Magnetocaloric Effect

Zarkevich

Zverev

2020

Crystals

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This review of the current state of magnetocalorics is focused on materials exhibiting a giant magnetocaloric response near room temperature. To be economically viable for industrial applications and mass production, materials should have desired useful properties at a reasonable cost and should be safe for humans and the environment during manufacturing, handling, operational use, and after disposal. The discovery of novel materials is followed by a gradual improvement of properties by compositional adjustment and thermal or mechanical treatment. Consequently, with time, good materials become inferior to the best. There are several known classes of inexpensive materials with a giant magnetocaloric effect, and the search continues.

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“…We believe that our study provides a useful prediction of the equilibrium properties of V12, even though the above-mentioned effects are of importance, for example, for the description of rotational MCE (see Ref. [ 38 ]). The inclusion of the lattice component might constitute an interesting task for future developments.…”

Section: Final Remarksmentioning

confidence: 99%

“…Within this context, molecular magnets offer a possibility of designing the magnetocaloric properties [ 31 ] and exhibit a degree of multifunctionality [ 32 ]. The optimization of magnetocaloric performance of molecular magnets [ 33 , 34 , 35 ] involves, for example, strategies based on exploiting the frustration [ 36 , 37 ], achieving particularly high spins [ 38 ] or utilizing magnetic anisotropy in rotational MCE [ 39 ]. One of the approaches can be connected with the pronounced sensitivity of the magnetic entropy to the magnetic field variation in the vicinity of the quantum level crossing [ 40 ] in magnetic clusters [ 41 ].…”

Section: Introductionmentioning

confidence: 99%

Low-Temperature Magnetocaloric Properties of V12 Polyoxovanadate Molecular Magnet: A Theoretical Study

Szałowski

2020

Materials

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The paper presents a computational study of the magnetocaloric properties of the V12 polyoxovanadate molecular magnet. The description is restricted to low-temperature range (below approximately 100 K), where the magnetic properties of the system in question can be sufficiently modelled by considering a tetramer that consists of four vanadium ions with spins S=1/2. The discussion is focused on the magnetocaloric effect in the cryogenic range. The exact and numerical diagonalization of the corresponding Hamiltonian is used in order to construct the thermodynamic description within a version of the canonical ensemble. The thermodynamic quantities of interest, such as magnetic entropy, specific heat, entropy change under isothermal magnetization/demagnetization, temperature change under adiabatic magnetization/demagnetization, refrigerant capacity, and magnetic Grüneisen ratio, are calculated and discussed extensively. The importance of two quantum level crossings for the described properties is emphasized. The significant ranges of direct and inverse magnetocaloric effect are predicted. In particular, the maximized inverse magnetocaloric response is found for cryogenic temperatures.

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Rotational magnetocaloric effect of anisotropic giant-spin molecular magnets

Cited by 14 publications

References 38 publications

Magnetocaloric Effect in Cu5-NIPA Molecular Magnet: A Theoretical Study

Magnetocaloric Effect in Cu5-NIPA Molecular Magnet: A Theoretical Study

Viable Materials with a Giant Magnetocaloric Effect

Low-Temperature Magnetocaloric Properties of V12 Polyoxovanadate Molecular Magnet: A Theoretical Study

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