V C Sahni
Articles written in Pramana – Journal of Physics
Volume 52 Issue 1 January 1999 pp 111-120
Magnetic structure of (Fe0.97Cr0.03)2P
Sudhish Kumar S K Paranjpe Bipin K Srivastava Anjali Krishnamurthy V C Sahni
Magnetic behaviour of di-metal iron phosphide with a small substitution of iron by chromium, (Fe0.97Cr0.03)2P, has been studied using SQUID magnetometry and powder neutron diffraction. It is paramagnetic at temperatures above ∼180 K with persisting short range ferromagnetic (FM) order. At lower temperatures three different regions of magnetic behaviour are identified. FM order evolves in the region 180 K-120 K but much more slowly and with much less magnetic moments than in Fe2P. In the region 120 K-50 K negative exchange interactions gain some importance leading to a loss of FM order. Below 50 K FM interactions again dominate. Pinning centres influence the behaviour at low temperature up to ∼100 K.
Volume 60 Issue 3 March 2003 pp 499-503
Correlation of thickness and magnetization in LCMO film
Sanghamitra Khatua P K Mishra J John V C Sahni
High quality thin films of La0.67Ca0.33MnO3 (LCMO) of different thickness were grown on LAO substrates by pulsed laser deposition (KrF, λ = 278 nm). The AFM images suggest a twodimensional step-growth. DC magnetization measurements of the films in a field of 500 Oe show that the magnetic ordering temperature is the same for all the films in both FC and ZFC conditions and is the same as that for the bulk. However, a difference is seen between the FC and ZFC magnetization of the films. There seems to be a systematic in this difference with respect to the thickness of the film, with the difference decreasing with thickness. We suggest that the difference in the magnetization under FC and ZFC conditions may be due to strain-induced anisotropy arising from the lattice mismatch between the substrate and the film or due to the shape anisotropy due to epitaxial growth
Volume 63 Issue 1 July 2004 pp 1-2
Volume 63 Issue 2 August 2004 pp 182-182a
Volume 68 Issue 2 February 2007 pp 331-342
Accelerator development in India for ADS programme
P Singh S V L S Rao Rajni Pande T Basak Shwetha Roy M Aslam P Jain S C L Srivastava Rajesh Kumar P K Nema S Kailas V C Sahni
At BARC, development of a Low Energy High Intensity Proton Accelerator (LEHIPA), as front-end injector of the 1 GeV accelerator for the ADS programme, has been initiated. The major components of LEHIPA (20 MeV, 30 mA) are a 50 keV ECR ion source, a 3 MeV Radio Frequency Quadrupole (RFQ) and a 20 MeV drift tube linac (DTL). The Low Energy Beam Transport (LEBT) and Medium Energy Beam Transport (MEBT) lines match the beam from the ion source to RFQ and from RFQ to DTL respectively. Design of these systems has been completed and fabrication of their prototypes has started. Physics studies of the 20{1000 MeV part of the Linac are also in progress. In this paper, the present status of this project is presented.
Volume 71 Issue 4 October 2008 pp 611-613
Volume 71 Issue 5 November 2008 pp 886f-886h
Volume 97, 2023
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