Understanding the large rotating magnetocaloric effect in TbMn1-Fe O3 single crystals upon q-Fermi Dirac nonextensive statistics

Fang, Yifei; Qiang, Gang; Liu, Xinzhi; Chen, Fei; Zhang, Jincang

doi:10.1016/j.jallcom.2017.09.049

Cited by 4 publications

(3 citation statements)

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“…In fact, the h-ErMnO3 crystal unveils almost zero hysteresis along the ab and c-directions. On the other hand, magnetization data were successfully used in the past to calculate the entropy change in similar materials (RMnO3) showing both first and second order magnetic phase transitions [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27].…”

Section: Resultsmentioning

confidence: 99%

“…Particularly, the production and utilization of liquified hydrogen is expected to markedly increase in the forthcoming years as an alternative source of energy [8]. To deal with the increasing demand for efficient solid state-refrigerants operating at very low temperatures, worldwide research works have been conducted leading to quite interesting systems such as DyGdAl5O12 garnets [9,10], RAl2 intermetallics (R = rare earth) [5], RMn2O5 [11,12] multiferroics and RMO3 oxides (M = transition metal) [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

“…Particularly, the RMnO3 compounds are still attracting a growing interest, because of their excellent magnetocaloric properties as well as their potential implementation in spintronic devices [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. Also, these oxides unveil degrees of freedom other than magnetization such as electric polarization, charge and volume change enabling additional potential caloric effects.…”

Section: Introductionmentioning

confidence: 99%

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Unusual rotating magnetocaloric effect in the hexagonal ErMnO3 single crystal

et al. 2018

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It is known that orthorhombic RMnO3 multiferroics (R = magnetic rare earth) with low symmetry exhibit a large rotating magnetocaloric effect because of their strong magnetocrystalline anisotropy. In this paper, we demonstrate that the hexagonal ErMnO3 single crystals also unveils a giant rotating magnetocaloric effect that can be obtained by spinning them in constant magnetic fields around their a or b axes. When the ErMnO3 crystal is rotated with the magnetic field initially parallel to the c-axis, the resulting entropy change reaches maximum values of 7, 17 and 20 J/kg K under a constant magnetic field of 2, 5 and 7 T, respectively. These values are comparable or even larger than those shown by some of the best orthorhombic phases. More interestingly, the generated anisotropic thermal effect is about three times larger than that exhibited by the hexagonal HoMnO3 single crystal.The enhancement of the rotating magnetocaloric effect in the hexagonal ErMnO3 compound arises from the unique features of Er 3+ magnetic sublattice. In fact, the Er 3+ magnetic moments located at 2a sites experience a first-order metamagnetic transition close to 3 K along the c-axis resulting in a peaked magnetocaloric effect over a narrower temperature range. In contrast, the "paramagnetic" behaviour of Er 3+ magnetic moments within the ab-plane, produces a larger magnetocaloric effect over a wider temperature range. Therefore, the magnetocaloric effect anisotropy is maximized between the c and the ab-directions, leading to a giant rotating magnetocaloric effect. *Mohamed.balli@usherbrooke.ca I. IntroductionBased on the well-known magnetocaloric effect (MCE), magnetic cooling is a trending technology that continues to attract a worldwide interest due to its potential high thermodynamic efficiency as well as its ecofriendly character [1][2][3][4][5][6][7][8]. The implementation of this emergent technology in our daily life would enable to fully suppress the harmful synthetic refrigerants such as fluorinated fluids, usually present in standard refrigerators and air-conditioners [1][2][3][4][5][6][7][8], thus allowing to meet the requirements of several treaties that were universally adopted by the international community aiming to reduce the utilization of CFCs, HCFCs and HFCs gases and, green house gases (GHG) emissions [1]. However, the search for advanced magnetocaloric materials with outstanding thermal, chemical and mechanical properties is necessary for the transfer of magnetic refrigeration technology towards the market place. In this context, a large MCE has been pointed out in a wide variety of magnetocaloric materials including both intermetallics and oxides [1-8]. Some of them such as LaFe13-xSix compounds, Fe2P-type materials and ABO3-based oxides have been successfully tested in room-temperature devices unveiling the bright future of magnetic refrigeration [1]. On the other hand, magnetic materials with excellent caloric effects at the temperature range below 30 K are of great importance in several low-temperature applications...

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