Metamagnetism and kinetic arrest in a long-range ferromagnetically ordered multicaloric double perovskite Y2CoMnO6

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:507

Article

Madhogaria, R. P.¹  Clements, E. M.¹  Kalappattil, V¹  Phan, M. H.¹  Srikanth, H.¹  Das, R.^2,3  Dang, N. T.^4,7  Kozlenko, D. P.⁵  Bingham, N. S.⁶ 

[1] Univ S Florida, Dept Phys, Tampa, FL 33620 USA

[2] Phenikaa Univ, Fac Mat Sci & Engn, Hanoi 10000, Vietnam

[3] Phenikaa Univ, Phenikaa Inst Adv Study, Hanoi 10000, Vietnam

[4] Duy Tan Univ, Inst Res & Dev, Da Nang 550000, Vietnam

[5] Joint Inst Nucl Res, Frank Lab Neutron Phys, Dubna 141980, Russia

[6] Yale Univ, Dept Appl Phys, New Haven, CT 06511 USA

[7] Duy Tan Univ, Fac Nat Sci, Da Nang 550000, Vietnam

关键词: Double perovskites;    Collective magnetism;    Kinetic arrest;   

DOI  :  10.1016/j.jmmm.2020.166821

来源: Elsevier

【 摘 要 】

A systematic magnetic study of the double perovskite oxide Y2CoMnO6 (YCMO) has been performed. A monoclinic P2(1)/n phase of YCMO was synthesized using a sol-gel method. Neutron diffraction (ND) measurements evidence the onset of long-range ferromagnetic (FM) ordering at T-C similar to 76 K, which persists down to 5 K. The presence of 25% antisite disorder, estimated from the ND data, leads to the appearance of short-range antiferromagnetic (AFM) interactions. The existence of thermal hysteresis due to competing interactions between FM and AFM phases is observed in the M vs. T measurements. The pinning of magnetic domain walls at the Co/Mn antiphase boundaries results in a metamagnetic-like behavior. The field dependence of thermomagnetic irreversibility and the nature of virgin curves indicate the occurrence of a kinetic arrest phenomenon, which is further verified via cooling and heating of the system in an unequal fields (CHUF) protocol. In full agreement with the ND data, a detailed analysis of critical exponents near the paramagnetic (PM)-FM phase transition also establishes YCMO as a long-range interacting mean-field system. A careful examination of the temperature- and field-dependent magnetic entropy change yields an in-depth understanding of coexisting magnetically ordered and disordered phases in YCMO, leading to a comprehensive magnetic phase diagram of this multifunctional double perovskite system.

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