Negative to positive magnetoresistance and magnetocaloric effect in Pr0.6Er0.4Al2

Pathak, Arjun K.; Gschneidner, K. A.; Pecharsky, V. K.

doi:10.1016/j.jallcom.2014.09.227

Cited by 9 publications

(3 citation statements)

References 24 publications

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“…(6) does not allow a full analytical solution, so we use numerical calculations to obtain the canonical partition function of Eq. (8). We separate the contributions of antidot energy (E ad nm ) in the form…”

Section: Modelmentioning

confidence: 99%

“…Moya et al [21] made a recompilation of recent high-temperature caloric materials and discussed other entropy-driven effects to generate thermal responses. Another interesting case is the compounds where the inverse and direct magnetocaloric effect are present [8,15] giving the possibility of a wider range of technological applications. This kind of behavior has been reproduced using theoretical models for multilayered systems under the competition of antiferromagnetic and ferromagnetic interactions [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Negrete

Peña

Vargas

2018

Preprint

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“…It has aroused great interest in the scientific community due to its potential applicability, the versatility in its use, and the widespread study of the magnetic properties of different types of materials at present . We highlight the works associated with high-temperature caloric materials [36], antiferromagnetic and ferromagnetic interactions [23,30,34,44,45], heavy lanthanides [46], Fe-Rh alloys [47], and diamagnetic systems [48][49][50][51][52][53]. We would also like to highlight the work associated with the MCE effect on magnetic systems done by V. Franco et al [54] and D. Serantes et al [55] in their studies dealing with magnetic nanowire arrays by applying the magnetic field perpendicular to the nanowire's axis when starting from the magnetic saturation state at the remanence and varying the applied field well below and above the magnetic anisotropy field value of the material.…”

Section: Introductionmentioning

confidence: 99%

Caloric Effect Due to the Aharonov–Bohm Flux in an Antidot

Martínez-Rojas,

Benavides-Vergara,

Peña

et al. 2023

Nanomaterials

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In this work, we report the caloric effect for an electronic system of the antidot type, modeled by combining a repulsive and attractive potential (parabolic confinement). In this system, we consider the action of a perpendicular external magnetic field and the possibility of having an Aharonov–Bohm flux (AB-flux) generated by a current passing through a solenoid placed inside the forbidden zone for the electron. The energy levels are obtained analytically, and the model is known as the Bogachek and Landman model. We propose to control the caloric response of the system by varying only the AB-flux, finding that, in the absence of an external magnetic field, the maximization of the effect always occurs at the same AB-flux intensity, independently of the temperature, while fixing the external magnetic field at a non-zero value breaks this symmetry and changes the point where the caloric phenomenon is maximized and is different depending on the temperature to which the process is carried. Our calculations indicate that using an effective electron mass of GaAs heterostructures and a trap intensity of the order of 2.896 meV, the modification of the AB-flux achieves a variation in temperature of the order of 1 K. Our analysis suggests that increasing the parabolic confinement twofold increases the effect threefold, while increasing the antidot size generates the reverse effect, i.e., a strong decrease in the caloric phenomenon under study. Due to the great diversity in technological applications that have antidots in electronics, the possibility of controlling their thermal response simply by varying the intensity of the internal current inside the solenoid (i.e., the intensity of AB-flux) can be a platform of interest for experimental studies.

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Magnetic Refrigeration Materials: Challenges and Future Perspectives

Zverev

Gimaev

2022

Encyclopedia of Smart Materials

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Negative to positive magnetoresistance and magnetocaloric effect in Pr0.6Er0.4Al2

Cited by 9 publications

References 24 publications

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

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

Caloric Effect Due to the Aharonov–Bohm Flux in an Antidot

Magnetic Refrigeration Materials: Challenges and Future Perspectives

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