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A Pilot Study to Evaluate an Integrated Phonics and Language Programme for the Teaching of Reading to Deaf and Hearing Children
Kinetic arrest of the first order ferromagnetic to antiferromagnetic transition in Ce(FeRu) : formation of a magnetic-glass
We present results of dc magnetization and magnetic relaxation study showing
the kinetic arrest of a first order ferromagnetic to antiferromagnetic
transition in Ce(FeRu). This leads to the formation of a
non-ergodic glass-like 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.Comment: 10 pages of text and 4 figure
Supercooling across first-order phase transitions in vortex matter
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 T or magnetic field H (and thus the density of vortices). Our
recent work on phase transitions with two control variables shows that the
observable region of metastability of the supercooled phase would depend on the
path followed in H-T space, and will be larger when T is lowered at constant H
compared to the case when H is lowered at constant T. We discuss the effect of
isothermal field variations on metastable supercooled states produced by
field-cooling. This path dependence is not a priori applicable to metastability
caused by reduced diffusivity or hindered kinetics.Comment: Tex, 8 pages, 3 Postscripts figures. Submitted to Pramana - J.
Physic
Lambda hyperonic effect on the normal driplines
A generalized mass formula is used to calculate the neutron and proton drip
lines of normal and lambda hypernuclei treating non-strange and strange nuclei
on the same footing. Calculations suggest existence of several bound
hypernuclei whose normal cores are unbound. Addition of Lambda or,
Lambda-Lambda hyperon(s) to a normal nucleus is found to cause shifts of the
neutron and proton driplines from their conventional limits.Comment: 6 pages, 4 tables, 0 figur
Interesting thermomagnetic history effects in the antiferromagnetic state of SmMn_2Ge_2
We present results of magnetization measurements showing that the magnetic
response of the antiferromagnetic state of SmMn_2Ge_2 depends on the path used
in the field(H)-temperature(T) phase space to reach this state. Distinct
signature of metastablity is observed in this antiferromagnetic state when
obtained via field-cooling/field-warming paths. The isothermal M-H loops show
lack of end-point memory, reminiscent of that seen in metastable vortex states
near the field-induced first order phase transition in various type-II
superconductors.Comment: 11 pages of text and 3 figure
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