We report the presence of ferromagnetic short-range interactions, metamagnetic transitions and spin-phonon coupling on monoclinic polycrystalline Nd2CoMnO6 double perovskite. DC thermomagnetic characterization shows a paramagnetic to ferromagnetic transition at TC1∼168 K and further to a cluster glass like magnetic transition at TC2∼135 K. Griffiths phase like features are also observed, attributed to the presence of competing magnetic interactions. Step like nature observed in the virgin curves of magnetic isotherms implies the presence of metamagnetic features. Additionally, temperature evolution of Raman spectra signatures spin-phonon coupling extending up to Griffiths like phase region indicating the possibility of magnetoelectric coupling in Nd2CoMnO6. © 2018

Padmam N. Santhosh

Department Of Physics

Ranjana R. Das

P. Neenu Lekshmi

Ferromagnetic materials

glass transition

Manganese compounds

Metamagnetism

Perovskite

Phonons

Ferromagnetic transitions

GRIFFITHS LIKE PHASE

Magnetic interactions

Magnetoelectric couplings

Metamagnetic transitions

ND2COMNO6

SHORT RANGE INTERACTIONS

SPIN-PHONON COUPLING

Ferromagnetism

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

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IIT Madras

Journal of Alloys and Compounds

Orthorhombic perovskite Pr2CrMnO6 has been synthesized by the Pechini method. XPS analysis confirms the presence of multiple oxidation states of Cr2+/Cr3+ and Mn3+/Mn4+ in the compound. From the electrical transport study, it is found that the resistivity of the material varies from 64 × 104-3 × 104 Ohm meter (Ωm) in the temperature range of 123-300 K. Variable range hopping of polarons is found to be responsible for the conduction in the material. The transition temperature (TC) of the compound is found to be at 57 K. From thermomagnetic data, the presence of short-range ferromagnetic correlations is confirmed, which constitutes the Griffiths-like phase in Pr2CrMnO6 up to the Griffiths temperature TG = 144 K. © 2019 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.

New Journal of Chemistry

A Griffiths-like phase and variable range hopping of polarons in orthorhombic perovskite Pr2CrMnO6

Polycrystalline sample of La2 CoMnO6 has been synthesized by sol-gel technique. The powder x-ray diffraction data confirm the single phase nature of the sample. This compound has monoclinic crystal structure (space group P 21 /n) at room temperature. The temperature dependence of magnetization in low field shows considerable variation between zero-field-cooled and field-cooled magnetization curve below ∼210 K (TC) and it follows Curie-Weiss law in the paramagnetic region. The hysteresis loop at 5 K indicates a coercive field of ∼6kOe and remnant magnetization of ∼2.32 μB /f.u. The temperature dependence of the resistivity data shows semiconductorlike behavior in the temperature range of 5-350 K and follows variable range hopping conduction mechanism in the temperature range 215-350 K. A colossal magnetoresistance of ∼80% is observed at 5 K in an applied field of 80 kOe and MR has a negative sign. © 2010 American Institute of Physics.

Fulltext

Journal of Applied Physics

Colossal magnetoresistance in the double perovskite oxide La 2CoMnO6

Scientific Reports

Giant Anisotropic Magnetocaloric Effect in Double-perovskite Gd2CoMnO6 Single Crystals

4 f -3 d exchange coupling induced exchange bias and field induced Hopkinson peak effects in Gd 2 CoMnO 6

Journal of Physics: Condensed Matter

Disordered ferromagnetism in Ho2NiMnO6double perovskite

Spin-phonon coupling in R2CoMnO6 (R = Pr, Nd, Sm) thin films under biaxial compressive strain

Competing short-range magnetic correlations, metamagnetic behavior and spin-phonon coupling in Nd2CoMnO6 double perovskite

Journal	Data powered by TypesetJournal of Alloys and Compounds
Publisher	Data powered by TypesetElsevier Ltd
ISSN	09258388
Open Access	No