Magnetic transitions and magnetocaloric effects in Fe0.75Mn1.35As

Sun, N. K.; Li, Didi; Zhang, Z. D.

doi:10.1007/s10853-009-3463-2

Cited by 3 publications

(1 citation statement)

References 23 publications

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“…Compounds undergoing a first-order structural and magnetic phase transition can lead to giant magnetic-field-induced entropy changes across their ordering temperatures. In fact, Fe 0.8 Mn 1.5 As and Fe 0.75 Mn 1.35 As were reported to show significant magnetocaloric effects.…”

Section: Computational Detailsmentioning

confidence: 99%

Competition between Direct and Indirect Exchange Couplings in MnFeAs: A First-Principles Investigation

Zhang

Miller

2014

J. Phys. Chem. C

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The electronic and magnetic structures of the tetragonal and hexagonal MnFeAs were examined using density functional theory to understand the reported magnetic orderings and structural change induced by highpressure synthesis. The reported magnetic ground states were confirmed using VASP total energy calculations. Effective exchange parameters for metal-metal contacts obtained from SPRKKR calculations indicate indirect exchange couplings are dominant in tetragonal MnFeAs. Weak direct exchange couplings for adjacent Fe-Fe and Fe-Mn contacts cause the coexistence of several low-energy magnetic structures in tetragonal MnFeAs and result in a near zero magnetic moment on the Fe atoms. On the other hand, the nearest-neighbor Fe-Fe and Fe-Mn interactions in hexagonal MnFeAs are a combination of direct and indirect exchange couplings. In addition, indirect exchange couplings in tetragonal MnFeAs are rationalized by both RKKY and superexchange mechanisms. Finally, to probe the high-pressure-induced phase transition, total energy changes with the change of volume was studied on both tetragonal and hexagonal MnFeAs. ABSTRACT: The electronic and magnetic structures of the tetragonal and hexagonal MnFeAs were examined using density functional theory to understand the reported magnetic orderings and structural change induced by high-pressure synthesis. The reported magnetic ground states were confirmed using VASP total energy calculations. Effective exchange parameters for metal−metal contacts obtained from SPRKKR calculations indicate indirect exchange couplings are dominant in tetragonal MnFeAs. Weak direct exchange couplings for adjacent Fe−Fe and Fe−Mn contacts cause the coexistence of several low-energy magnetic structures in tetragonal MnFeAs and result in a near zero magnetic moment on the Fe atoms. On the other hand, the nearest-neighbor Fe−Fe and Fe−Mn interactions in hexagonal MnFeAs are a combination of direct and indirect exchange couplings. In addition, indirect exchange couplings in tetragonal MnFeAs are rationalized by both RKKY and superexchange mechanisms. Finally, to probe the high-pressure-induced phase transition, total energy changes with the change of volume was studied on both tetragonal and hexagonal MnFeAs.

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Section: Computational Detailsmentioning

confidence: 99%

Competition between Direct and Indirect Exchange Couplings in MnFeAs: A First-Principles Investigation

Zhang

Miller

2014

J. Phys. Chem. C

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Magnetism and magnetocaloric properties of Mn0.95Cr0.05As

Sun

Gao

et al. 2011

Physica B: Condensed Matter

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Influence of magnetic frustration and structural disorder on magnetocaloric effect and magneto-transport properties in La1.5Ca0.5CoMnO6 double perovskite

Sahoo

Das

Nath

2018

Journal of Applied Physics

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The rare existence of a magnetocaloric effect, a Griffith phase, and frustrated magnetism in the antisite disorder compound La1.5Ca0.5CoMnO6 have been investigated in detail in this work. The nature of the observed Griffith phase (at TG ∼ 226 K) can be best understood in terms of ferromagnetic (FM) entities within the globally paramagnetic network above the Curie temperature. From the isothermal magnetization measurement around Curie temperature (TC ∼ 157 K) and cluster glass transition temperature (Tg ∼ 51 K), we have determined the maximum entropy change (−ΔSM) as ∼2.2 J/kg K and ∼1.2 J/kg K, respectively, for a magnetic field variation of 7 T. Interestingly, a sudden drop of resistivity curve at Tg, associated with magnetic frustration or magnetic disorder, can be related to the ferromagnetic (FM) phases with antiferromagnetic antiphase boundaries, giving rise to a large negative magnetoresistance (∼67%) at 45 K.

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Magnetic transitions and magnetocaloric effects in Fe0.75Mn1.35As

Cited by 3 publications

References 23 publications

Competition between Direct and Indirect Exchange Couplings in MnFeAs: A First-Principles Investigation

Competition between Direct and Indirect Exchange Couplings in MnFeAs: A First-Principles Investigation

Magnetism and magnetocaloric properties of Mn0.95Cr0.05As

Influence of magnetic frustration and structural disorder on magnetocaloric effect and magneto-transport properties in La1.5Ca0.5CoMnO6 double perovskite

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