Giant enhancement of room temperature magnetoresistance in La_{0.67}Sr_{0.33}MnO_{3}/Nd_{0.67}Sr_{0.33}MnO_{3} multilayers

The metal-insulator transition temperature in CMR manganites has been altered and brought close to the room temperature by preparing La$_{0.67}$Sr$_{0.33}$MnO$_{3}$ (LSMO)/ Nd$_{0.67}$Sr$_{0.33}$MnO$_{3}$ (NSMO) multilayers with ultra thin individual layers of LSMO and NSMO. The LSMO/NSMO multilayers with ultra thin individual layers of thickness of about $10\AA$ exhibits 150% magnetoresistance at 270 K whereas LSMO/NSMO multilayers with moderate individual layer thickness of about $40\AA$ each exhibits a mere 15% magnetoresistance at the same temperature. We have shown that the reduction in thickness of the individual layers leads to increased spin fluctuation which results in the enhancement of magnetoresistance.Comment: Replaced with revised version and new figure, 9 pages, 4 figure

The Dual Phase Oscillation Hypothesis and the Neuropsychology of Docu-Fiction Film

The dual phase oscillation (DPO) hypothesis recently proposed by Mukhopadhyay (2014), is based on the neural correlate of aesthetic paradox; the paradox referring to a state of simultaneous heightened emotional experience and a state of detached composure during art appreciation. The hypothesis proposed that aesthetic delight is the dynamic, oscillatory balance between Suspension of Disbelief (SOD) and Introspective Detached Contemplation (IDC) and is orchestrated by functional coherence of the Default Mode Network (DMN) of the brain. This article is an extrapolation of the concepts of the DPO hypothesis which here is theoretically integrated with the experience of the art form of film. In film, an important functional aspect of SOD, in addition to other central elements, is the suppression of the literal identity of the performer in the narrative performance and an overall suspension of the awareness that the art form is staged. Docu-fiction film, a developing genre in contemporary filmmaking, attempts to capture documentary reality while simultaneously introducing fictional elements in the narrative. The article proposes that in docu-fiction film, the SOD-IDC dynamics of both a fiction film and a documentary film operates oscillating in a bigger scenario and the preconceived mindset of the audience cannot offer a stable expectancy regarding the genre of the film which introduces the element of ambiguity. Thus docu-fiction film-making exploits the unique attributes of the art form of film (by portraying verisimilitude as well as imaginative abstraction and fiction) at its fullest following the DPO hypothesis

Compact bifluid hybrid stars: Hadronic Matter mixed with self-interacting fermionic Asymmetric Dark Matter

The masses and radii of non-rotating and rotating configurations of pure hadronic stars mixed with self-interacting fermionic Asymmetric Dark Matter are calculated within the two-fluid formalism of stellar structure equations in general relativity. The Equation of State (EoS) of nuclear matter is obtained from the density dependent M3Y effective nucleon-nucleon interaction. We consider dark matter particle mass of 1 GeV. The EoS of self-interacting dark matter is taken from two-body repulsive interactions of the scale of strong interactions. We explore the conditions of equal and different rotational frequencies of nuclear matter and dark matter and find that the maximum mass of differentially rotating stars with self-interacting dark matter to be $\sim 1.94 M_\odot$ with radius $\sim 10.4$ kms.Comment: 9 pages including 1 table & 8 figure