S B Roy
Articles written in Pramana – Journal of Physics
Volume 21 Issue 3 September 1983 pp 171-182 Solid State Physics
The Ising model with competing interactions is studied in a mean field effective medium approach. The phase diagram of such model alloys is studied. We conclude that for all ratios of the competing interaction moments, a spin glass phase always exists at low temperatures for certain concentration regimes.
Volume 24 Issue 4 April 1985 pp 563-574 Solid State Physics
The Heisenberg model with competing interactions is studied within a mean field, effective medium approach. The phase diagram indicates the existence of a mixed or randomly canted phase just beyond the spin glass regime. Experimental evidence of such a phase in alloys like FeCr is studied.
Volume 41 Issue 1 July 1993 pp 51-60
We present measurements of harmonic generation in the magnetization of sintered pellets of YBa2Cu3O7 and Bi1.7Pb0.3Sr2Ca2Cu3O10 as a function of DC field. The DC field is applied in the field-cooled mode. Measurements are made at 77 K for various values of the AC field amplitude. A comparison is made with calculations done within the critical state model.
Volume 45 Issue 3 September 1995 pp 261-269
Results are presented for study of nonlinear magnetization of a sintered YBa2Cu3O7−y pellet of different thickness of a sample subjected to very low magnetic field. On cooling the sample below
Volume 53 Issue 4 October 1999 pp 659-684 Review Article
Superconductivity in CeRu2 was discovered 40 years ago, and was extensively studied because alloying with magnetic elements showed the coexistence of superconductivity and magnetic order. The normal state of CeRu2 has been of interest because of its intermediate valuence character. The superconducting state has been studied extensively because of its paramagnetic nature and anomalous pinning properties. This review presents the present status of knowledge, and discusses the puzzling features of CeRu2.
Volume 54 Issue 6 June 2000 pp 857-862
Hysteresis in cycling through first-order phase transitions in vortex matter, akin to the well-studied phenomenon of supercooling of water, has been discussed in literature. Hysteresis can be seen while varying either temperature
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