Magnetization-steps in Y2CoMnO6 double perovskite: The role of antisite disorder
Harikrishnan S. Nair,R. Pradheesh,Yinguo Xiao,Dona Cherian,Suja Elizabeth,Thomas C. Hansen,Tapan Chatterji,Th. Brückel +7 more
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TLDR
In this paper, a paramagnetic-ferromagnetic phase transition occurs in the double perovskite Y2CoMnO6 which has been recently identified as a multiferroic.Abstract:
Antisite disorder is observed to have significant impact on the magnetic properties of the double perovskite Y2CoMnO6 which has been recently identified as a multiferroic. A paramagnetic-ferromagnetic phase transition occurs in this material at Tc ≈ 75 K. At 2 K, it displays a strong ferromagnetic hysteresis with a significant coercive field of Hc ≈ 15 kOe. Sharp steps are observed in the hysteresis curves recorded below 8 K. In the temperature range 2 K ≤ T ≤ 5 K, the hysteresis loops are anomalous as the virgin curve lies outside the main loop. The field-cooling conditions as well as the rate of field-sweep are found to influence the steps. Quantitative analysis of the neutron diffraction data shows that at room temperature, Y2CoMnO6 consists of 62% of monoclinic P21/n with nearly 70% antisite disorder and 38% Pnma. The bond valence sums indicate the presence of other valence states for Co and Mn which arise from disorder. We explain the origin of steps by using a model for pinning of magnetization at the antiphase boundaries created by antisite disorder. The steps in magnetization closely resemble the martensitic transformations found in intermetallics and display first-order characteristics as revealed in the Arrott's plots.read more
Citations
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Optical Thermometry Based on Vibration Sidebands in Y2MgTiO6:Mn4+ Double Perovskite
TL;DR: The maximum sensor sensitivity of Y2MgTiO6:Mn4+ is determined to be as high as 0.001 42 K-1 at 153 K, which demonstrates potential applications for the optical thermometry at low-temperature environments.
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Antisite disorder-induced exchange bias effect in multiferroic Y2CoMnO6
TL;DR: The role of antisite disorder in creating the domain structure leading to exchange bias effect is highlighted in this article, where a model based on growth of ferromagnetic domains overcoming the elastic energy of structurally pinned magnetic interfaces, which closely resembles martensitic-like transitions, is adapted to explain the observed effects.
Journal ArticleDOI
Effect of rare earth site substitution on magnetic and transport properties of Ln2CoMnO6 (Ln = La, Sm and Gd) double perovskites
TL;DR: In this article, the influence of rare earth site substitution on structural, transport and magnetic characteristics of polycrystalline Ln2CoMnO6 (Ln= La, Sm and Gd) has been systematically investigated in details.
Journal ArticleDOI
Antisite Disorder-induced Exchange Bias Effect in Multiferroic Y2CoMnO6
TL;DR: The role of antisite disorder in creating the domain structure leading to exchange bias effect is highlighted in this paper, where a model based on growth of ferromagnetic domains overcoming the elastic energy of structurally pinned magnetic interfaces, which closely resembles martensitic-like transitions, is adapted to explain the observed effects.
Journal ArticleDOI
Disordered ferromagnetism in Ho2NiMnO6 double perovskite
Tirthankar Chakraborty,Harikrishnan S. Nair,Harikrishnan S. Nair,Hariharan Nhalil,K. Ramesh Kumar,André M. Strydom,Suja Elizabeth +6 more
TL;DR: Magnetic and dielectric properties of the double perovskite Ho2NiMnO6 are reported and signs of inherent Griffiths phase pertaining to the Ni/Mn subsystem are visible.
References
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Magnetic ordering in double perovskites R2CoMnO6 (R = Y , Tb) investigated by high resolution neutron spectroscopy
TL;DR: In this article, low energy nuclear spin excitations in double perovskite compounds R2CoMnO6 (R=Y, Tb) were investigated by inelastic neutron scattering with a high resolution back-scattering spectrometer.
Journal ArticleDOI
Magnetic anomalies in Gd6Co1.67Si3 and Tb6Co1.67Si3
S. Narayana Jammalamadaka,Niharika Mohapatra,Sitikantha D. Das,Kartik K. Iyer,E. V. Sampathkumaran +4 more
TL;DR: In this article, the isothermal entropy change (Delta S) was derived from the M(H) data measured at close intervals of temperature, and it was found that Delta S follows a theoretically predicted H^2/3-dependence.