P. Chaddah

Kinetic arrest of the first-order ferromagnetic-to-antiferromagnetic transition in Ce ( Fe 0.96 Ru 0.04 ) 2 : Formation of a magnetic glass

We present the results of a dc magnetization and magnetic relaxation study showing the kinetic arrest of a first-order ferromagnetic-to-antiferromagnetic transition in

First-order transition from antiferromagnetism to ferromagnetism inCe(Fe0.96Al0.04)2

mathrm{Ce}{({mathrm{Fe}}_{0.96}{mathrm{Ru}}_{0.04})}_{2}

Magnetocaloric effect in La1−xSrxCoO3 (0.05⩽x⩽0.40)

, resulting from the viscous retardation of growth of the antiferromagnetic phase. This leads to the formation of a nonergodic glasslike magnetic state. The onset of the magnetic-glass transformation is tracked through the slowing down of the magnetization dynamics. This glassy state is formed with the assistance of an external magnetic field and this is distinctly different from the well-known spin-glass state.

Sharp magnetization step across the ferromagnetic-to-antiferromagnetic transition in doped CeFe 2 alloys

Results of dc magnetization study are presented showing interesting thermomagnetic history effects across the antiferromagnetic to ferromagnetic transition in Ce(Fe

On the anomalous pinning properties of the C15 Laves phase superconductor CeRu2

_{0.96}

DC-magnetisation studies in the La1−xSrxCoO3 (x≤0.4) system

Al

Metamagnetic transition in Ce(Fe0.96Al0.04)2: a dc magnetization study

_{0.04})_2

Transport properties of the ferromagnetic Heusler alloy Co 2 TiSn

. Specifically, we observe (i)ZFC/FC irreversibility rising with increasing field; (ii) virgin curve lying outside the envelope M-H curve. We argue that these effects are quite different from the characteristics seen in spin-glasses or in hard ferromagnets; they can be understood as metastabilities associated with a first order magnetic phase transition.

First order transition from ferromagnetism to antiferromagnetism in Ce(Fe0.96Al0.04)2: a magnetotransport study

We report studies of magnetocaloric effect in lanthanum cobaltate doped with different Sr-concentrations, La1-xSrxCoO3 (0.05 less than or equal to x less than or equal to 0.4). The study has revealed that La0.6Sr0.4CoO3, which exhibits a moderately large value of maximum entropy change of about 1.45 J/kg/K in 1.5 T DC-fieid around its Curie temperature (of 235 K), can be used as an active magnetic refrigerant (AMR) material at similar to 2.35 K

The anomalous mixed state of the C15 Laves phase superconductor : a magnetization study

Very sharp magnetization step is observed across the field-induced antiferromagnetic-to-ferromagnetic transition in various doped CeFe 2 alloys, when the measurement is performed below 5 K. In the higher temperature regime (T>5 K) this transition is quite smooth in nature. Comparing to the recently observed similar behavior in manganites showing colossal magnetoresistance and magnetocaloric material Gd 5 Ge 4 , we argue that such a magnetization step is a generalized feature of a disorder-influenced first-order phase transition.