Critical behavior and reversible magnetocaloric effect in multiferroic MnCr2O4

Dey, K and Indra, A and Majumdar, S and Giri, S (2017) Critical behavior and reversible magnetocaloric effect in multiferroic MnCr2O4. In: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 435 . pp. 15-20.

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Abstract

Magnetocaloric effect (MCE) in multiferroic cubic spinel MnCr2O4 (space group Fd (3) over barm, no. 227, cF56), has been investigated using dc magnetization studies. The values of maximum magnetic entropy change (Delta S-M(max)) and the adiabatic temperature change (Delta T-ad) are similar to 5.3 J kg(-1) K-1 and similar to 2 K, respectively, at similar to 42.8 K for the magnetic field change of 50 kOe. The dc magnetization data near the transition temperature were analyzed by the modified Arrott plots, the Kouvel-Fisher method, log M vs log H, and the scaling analysis. Critical exponents beta = 0.3932 +/- 0.0287, gamma = 1.0256 +/- 0.0239, and delta = 3.55 +/- 0.26 are obtained around the critical temperature similar to 42.88 K. The critical exponents are in excellent agreement with the single scaling equation of state M(H, is an element of) = is an element of(0: 3932 +/- 0: 0287) f(+/-)(H/is an element of(((0: 3932 +/- 0: 0287)+(1: 0256 +/- 0: 0239)))); with f(+) for T > 42.88 K, f(-) for T < 42.88 K, and is an element of = (T - 42.88)/42.88. At T = 42.88 K, the exponent d relates the magnetization with applied filed by M - H-(1/3: 55 +/- 0: 26) Scaling analysis shows that calculated critical exponents as well as critical temperature are intrinsic to the system. Theoretically, the value of b is close to 3D Heisenberg model, while values of c and d are close to those of the mean field model. So the values of critical exponents indicate that the critical behavior of MnCr2O4 cannot be described within the framework of existing universality classes and probably belong to a separate class. (C) 2017 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Additional Information:	Copy right for this article belongs to the ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	28 Jun 2017 06:20
Last Modified:	28 Jun 2017 06:20
URI:	http://eprints.iisc.ac.in/id/eprint/57261

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