Articles written in Bulletin of Materials Science

    • Magnetization reversal and ferrimagnetism in Pr,1–𝑥Nd𝑥MnO3

      Sanjay Biswas Momin Hossain Khan Sudipta Pal

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      Detailed magnetic properties of Pr1–𝑥Nd𝑥MnO3 (𝑥 = 0.3, 0.5 and 0.7) have been reported. All the samples crystallize in orthorhombic perovskite structure with Pnma space group. Magnetization measurements under field cooled (FC) protocal reveal magnetization reversal at low temperatures and low magnetic field. This indicates clear evidence of two magnetic sublattices aligned opposite to each other. There is a well-defined maximum around 48 K in the 𝑥 = 0.7 sample (i.e. Pr0.3Nd0.7MnO3) in the 𝜒' value which is identified as paramagnetic to ferrimagnetic transition. The peak value shifts to higher temperature with decrease of 𝑥 and width of the maximum broadened. It is also observable that with decrease of Nd, both the value of 𝜒' and 𝜒" decrease. An attempt is made to explain the magnetization reversal within the framework of available models

    • Monovalent (Li$^{+1}$) doping effect in multiferroic GdMnO$_3$


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      This paper reports the temperature- and field-dependent magnetic properties of monovalent-doped polycrystalline sample Gd$_{0.85}$Li$_{0.15}$MnO$_3$ (GLMO) prepared by conventional solid-state reaction route. Final sintering at 1673 K for 18 h yields in the formation of well-grown, impurity phase free, single-phased, orthorhombic structured (with Pbnm space group) crystal. The optical properties have been investigated by UV-absorption spectra. The room temperature UV-absorption spectrum using Tauc’s formula gives an optical band gap of $\sim$3.12 eV. The paramagnetic (PM) state to incommensurateantiferromagnetic (ICAFM) state transition temperature increases due to Li doping. Magnetic hysteresis curve at 5 K signifies the Gd spin ordering.

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    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

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      Posted on July 25, 2019

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