Anomalous magnetic behavior of CuO nanoparticles (2009)
Bisht, Vijay, Rajeev, K. P., Banerjee, Sangam
We report studies on temperature, field and time dependence of magnetization on cupric oxide nanoparticles of sizes 9 nm, 13 nm and 16 nm. The nanoparticles show unusual features in comparison to...
Memory, Aging and Spin Glass Nature: A Study of NiO Nanoparticles (2009)
We report studies on magnetization dynamics in NiO nanoparticles of average size 5 nm. Temperature and time dependence of dc magnetization, wait time dependence of magnetic relaxation (aging) and...
Evidence of kinetically arrested supercooled phases in the pervoskite oxide NdNiO$_3$ (2009)
Kumar, Devendra, Rajeev, K. P., Alonso, J. A., Lope, M. J. Martinez
We report the time and temperature dependent response of thermopower in the non-magnetic perovskite oxide NdNiO$_3$. We find that on cooling below the metal-insulator transition temperature the...
Unusual non-equilibrium behavior of cupric oxide nanoparticles (2009)
Bisht, Vijay Kumar, Rajeev, K. P., Banerjee, Sangam
We report studies on temperature, field and time dependence of magnetization on cupric oxide nanoparticles of sizes 9 nm, 13 nm and 16 nm. The nanoparticles show unusual features in comparison to...
Slow Dynamics in Hard Condensed Matter: A Case Study of the Phase Separating System NdNiO$_3$ (2008)
Kumar, Devendra, Rajeev, K. P., Alonso, J. A., Martinez-Lope, M. J.
We report the time dependent response of electrical resistivity in the non-magnetic perovskite oxide NdNiO$_3$ in its phase separated state and provide a physical explanation of the observations. We...
Supercooling and the Metal-Insulator Phase Transition of NdNiO$_{3}$ (2007)
Kumar, Devendra, Rajeev, K. P., Alonso, J. A., Martinez-Lope, M. J.
We report the temperature and time dependence of electrical resistivity on high temperature, high oxygen pressure prepared polycrystalline samples of NdNiO_3. NdNiO_3 is metallic above 195 K and...
Paramagnetic to Superparamagnetic Transition in Ni(OH)_2 Nanoparticles (2007)
We report the temperature and field dependence of dc magnetization on sol-gel prepared nanoparticles of Ni(OH)_2. At higher temperature the system is found to behave as a paramagnet while we find...
Signatures of Spin Glass Freezing in NiO Nanoparticles (2005)
We present a detailed study of the magnetic properties of sol-gel prepared nickel oxide nanoparticles of different sizes. We report various measurements such as frequency, field and temperature...
Further Evidences for Spin Glass like behavior in NiO nanoparticles (2004)
Nickel oxide nanoparticles are prepared by a sol gel method and characterized by x-ray diffraction and transmission electron microscope. Here we present measurements on temperature and field...
Magnetic Susceptibility of NiO Nanoparticles (2004)
Nickel oxide nanoparticles of different sizes are prepared and characterized by x-ray diffraction and transmission electron microscopy. A.C. susceptibility measurements as a function of temperature...
Sudhakar, N., Ningthoujam, R.S., Rajeev, K.P., Nigam, A.K., Weissmüller, J., Gajbhiye, N.S.
Journal of Applied Physics, 96(2004) S.688-95