Large reversible magnetocaloric effect in HoMn<sub>2</sub>O<sub>5</sub>

Ge, Heng; Zhang, Xiang-Qun; Ke, Ya-Jiao; Jin, Jin-Ling; Liao, Zhi‐Xin; Cheng, Zhao‐Hua

doi:10.1088/1674-1056/22/5/057502

Cited by 14 publications

(5 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The maximum value of ∆S m (-∆S max m ) increases with increase in field and reaches as high as 36 J kg −1 K −1 for a field change of 0-7 T, which is more than double of the previously reported values of ∆S m for other members of the RMn 2 O 5 family. 29,47,48 We would also like to mention that the observed value of ∆S m is significantly larger than that reported for several rare-earth transition metal oxides and intermetallic compounds. [13][14][15][16] A comparative study of ∆S m of GdCrTiO 5 with other rare-earth based oxide compounds at same field and temperature range has been shown in Table I.…”

Section: Resultsmentioning

confidence: 76%

Giant magnetocaloric effect in an exchange-frustrated GdCrTiO5 antiferromagnet

et al. 2018

View full text Add to dashboard Cite

We report the effect of exchange frustration on the magnetocaloric properties of GdCrTiO5 compound. Due to the highly exchange-frustrated nature of magnetic interaction, in GdCrTiO5, the long-range antiferromagnetic ordering occurs at much lower temperature TN =0.9 K and the magnetic cooling power enhances dramatically relative to that observed in several geometrically frustrated systems. Below 5 K, isothermal magnetic entropy change (-∆Sm) is found to be 36 J kg −1 K −1 , for a field change (∆H) of 7 T. Further, -∆Sm does not decrease from its maximum value with decreasing in T down to very low temperatures and is reversible in nature. The adiabatic temperature change, ∆T ad , is 15 K for ∆H=7 T. These magnetocaloric parameters are significantly larger than that reported for several potential magnetic refrigerants, even for small and moderate field changes. The present study not only suggests that GdCrTiO5 could be considered as a potential magnetic refrigerant at cryogenic temperatures but also promotes further studies on the role of exchange frustration on magnetocaloric effect. In contrast, only the role of geometrical frustration on magnetocaloric effect has been previously reported theoretically and experimentally investigated on very few systems. arXiv:1805.02056v1 [cond-mat.mtrl-sci]

show abstract

Section: Resultsmentioning

confidence: 76%

Giant magnetocaloric effect in an exchange-frustrated GdCrTiO5 antiferromagnet

et al. 2018

View full text Add to dashboard Cite

show abstract

“…A reversible magnetocaloric effect has also been observed in HoMn 2 O 5 . [6] Moreover, the magnetoelectric coupling effect has also been studied in thin films. [7][8][9] The main structure of all manganese RMn 2 O 5 compounds crystallizes in the isostructural orthorhombic symmetry with space group Pbam.…”

Section: Introductionmentioning

confidence: 99%

Magnetoelectric effect in multiferroic NdMn ₂ O ₅

Bukhari

Ahmad

2017

Chinese Phys. B

View full text Add to dashboard Cite

We have measured the dielectric constant for NdMn 2 O 5 in an external magnetic field to map out the magnetoelectric phase diagram. The phase diagram corresponds well with the previously reported data of neutron diffraction and magnetic susceptibility. Our main finding is the observation of a dielectric anomaly in the low temperature phase with a strong magnetoelectric effect, which is attributed to the independent Nd 3+ ordering. Moreover, the absence of the dielectric anomaly in the paramagnetic phase is discussed, keeping in view the exchange interaction and its dependence on the rareearth R 3+ ionic radius.

show abstract

“…Until now, a thorough investigation has been carried out to comprehend the HoMn 2 O 5 (HMO), particularly at low temperature [9][10][11]. HMO gave the series of complex phase transition due to long range ordering in Ho 3+ moments and also by coexistence of the Mn 3+ and Mn 4+ [9]. Moreover, giant magneto caloric effect in HMO has been identified by using the first principles study and Monte-Carlo simulations [12].…”

Section: Introductionmentioning

confidence: 99%

Structural and spectroscopic analysis of HoMn₂O₅ multiferroics

Ahmad

Afzal²,

Nissar³

et al. 2022

Phys. Scr.

View full text Add to dashboard Cite

HoMn2O5was synthesized by sol-gel auto combustion method and analyzed through x-ray diffraction, Fourier transform infrared reflectivity, Raman, UV-visible, Photoluminescence spectroscopies at room temperature and transport properties (applying dc- and ac- electric field) at high temperatures. Structural characterizations revealed single-phase nature and the analysis confirms the crystal structure by Rietveld refinement with orthorhombic symmetry (space group Pbnm). Both Scherer formula and Williamson-Hall analysis have been used to estimate the average grain size; the results come in good agreement. The reflectivity spectrum was fitted by the Lorentz oscillator model to account for the infrared active optical phonons. The Raman spectrum was measured in unpolarized geometry using a 514 nm laser excitation source, which confirmed its orthorhombic crystal structure. UV-visible spectroscopy demonstrated the electronic structure and semiconducting behavior of sample with an estimated bandgap of 1.54 eV. PL spectrum suggested its electronic transition and vibrations of Mn-O bonds. The conduction mechanism was investigated by measuring electrical resistivity in temperature range (293-473K) by two probe method. Dielectric properties have been discussed in terms of variation in dielectric constant, tangent loss, and conductivity as a function of temperature and frequency.

show abstract

Large reversible magnetocaloric effect in HoMn₂O₅

Cited by 14 publications

References 24 publications

Giant magnetocaloric effect in an exchange-frustrated GdCrTiO5 antiferromagnet

Giant magnetocaloric effect in an exchange-frustrated GdCrTiO5 antiferromagnet

Magnetoelectric effect in multiferroic NdMn ₂ O ₅

Structural and spectroscopic analysis of HoMn₂O₅ multiferroics

Contact Info

Product

Resources

About

Large reversible magnetocaloric effect in HoMn2O5

Cited by 14 publications

References 24 publications

Giant magnetocaloric effect in an exchange-frustrated GdCrTiO5 antiferromagnet

Giant magnetocaloric effect in an exchange-frustrated GdCrTiO5 antiferromagnet

Magnetoelectric effect in multiferroic NdMn 2 O 5

Structural and spectroscopic analysis of HoMn2O5 multiferroics

Contact Info

Product

Resources

About

Large reversible magnetocaloric effect in HoMn₂O₅

Magnetoelectric effect in multiferroic NdMn ₂ O ₅

Structural and spectroscopic analysis of HoMn₂O₅ multiferroics