Abstract
The effect of Dy doping on CaMnO3 (CDMO) has been thoroughly investigated. The room-temperature structure, low-temperature magnetic transitions, and high-temperature electrical properties of CDMO were studied using X-ray diffraction, magnetization, and dielectric techniques. The CDMO exhibits an orthorhombic structure with Pnma symmetry. The low-temperature magnetic susceptibility data show the ferromagnetic domains embedded in the antiferromagnetic structure (G-type), and it confirms the Neel temperature (TN) approximately 55 K. Temperature-dependent dielectric data measured using a few selected frequencies show a high dielectric constant ~ 29,108,808 at 1 kHz. The presence of a high dielectric constant at the lower frequency side can be attributed to the space charge polarization (SCP) and compositional disorder (heterogeneity) in the compounds. The impedance cole-cole plot shows a depressed semicircle; mathematically these data were fitted by the Kohlrausch-Williams-Watt model. From this model obtained two mechanisms: (i) the electric modulus divulges the CDMO ceramic tails the Non-Debye type of relaxation and (ii) the electric modulus peak shifting evidence the charge carrier mobility from long range to short range. High-temperature dielectric, resistivity, and conductivity data show a clear anomaly around 461 K, owing to metal to insulator transition.
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Acknowledgments
The authors RB and SM thank the UGC DAE CSR Mumbai for providing experimental facilities. The author (SM) thanks the Vision Group on Science and Technology (VGST), for sanctioning the project under the scheme of Establishment of “Centre of Excellence in Science, Engineering and Medicine” (CESEM) (GRD Number: 852) Government of Karnataka. SM also thanks the KLE Society and B. K. College, Chikodi, Karnataka, India, for providing infrastructure.
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Bharamagoudar, R., Angadi, V.J., Shivaraja, I. et al. Evidence of Weak Ferromagnetism, Space Charge Polarization, and Metal to Insulator Transition in Dy-Doped CaMnO3. J Supercond Nov Magn 34, 837–844 (2021). https://doi.org/10.1007/s10948-020-05770-1
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DOI: https://doi.org/10.1007/s10948-020-05770-1