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BARC


Mandate

Solid State Physics Division carries out frontier research on various aspects of Condensed Matter Physics.
✔ Advanced Magnetic Materials
✔ Structure and Dynamics of Functional Materials
✔ Soft Matter Structure and Interaction Studies
✔ Nano Structures and Interaction Studies
The Division is responsible for the building, maintenance, operation and utilization of the National Facility for Neutron Beam Research (NFNBR) at Dhruva reactor.
In addition, the Division is also responsible for development of neutron detectors such as BF3 Proportional Counters, 3He based 1-D Position Sensitive Detectors and 2-D Area Detectors.


Highlights


9/2020

From various experiments on highly irradiated graphite samples from CIRUS reactor at Trombay and ab-initio simulations, we have for the first time identified various 2-, 3- and 4-coordinated topological structures in defected graphite, and provided microscopic mechanism of defect annihilation on heating and release of the Wigner energy. The annihilation process involves cascading cooperative movement of atoms in two steps involving an intermediate structure



9/2020

From various experiments on highly irradiated graphite samples from CIRUS reactor at Trombay and ab-initio simulations, we have for the first time identified various 2-, 3- and 4-coordinated topological structures in defected graphite, and provided microscopic mechanism of defect annihilation on heating and release of the Wigner energy. The annihilation process involves cascading cooperative movement of atoms in two steps involving an intermediate structure



8/2020

Using spin-polarized neutron reflectivity experiments, an unusual proximity behaviorhas been demonstrated when a superconductor (SC) and a ferromagnet (FM) are coupled through an insulator (I) in YBa2Cu3O7−δ (SC)/SrTiO3 (I)/La0.67Sr0.33MnO3 (FM) heterostructures. We have observed an unexpected magnetic reversal confined to the interface region of the FM below the superconducting transition temperature. The magnetization of the interfacial FM layer at the I/FM interface was found to be aligned opposite to the magnetization of the rest of the FM layer. The magnetic exchange field-effect across SC/I/FM interfaces driven by tunneling may serve as the basis for application in superconducting spintronic devices.



8/2020

Using spin-polarized neutron reflectivity experiments, an unusual proximity behaviorhas been demonstrated when a superconductor (SC) and a ferromagnet (FM) are coupled through an insulator (I) in YBa2Cu3O7−δ (SC)/SrTiO3 (I)/La0.67Sr0.33MnO3 (FM) heterostructures. We have observed an unexpected magnetic reversal confined to the interface region of the FM below the superconducting transition temperature. The magnetization of the interfacial FM layer at the I/FM interface was found to be aligned opposite to the magnetization of the rest of the FM layer. The magnetic exchange field-effect across SC/I/FM interfaces driven by tunneling may serve as the basis for application in superconducting spintronic devices.



7/2020

A process in which a disordered system of pre-existing molecules generates an organized structure through specific, local interactions among the molecules themselves is termed molecular self-assembly. We used a combination of neutron scattering and molecular dynamics simulation studies in probing the dynamic landscape in various self-assembled surfactant aggregates. Neutron scattering experiments were carried out using several spectrometers covering a wide dynamic range to probe motions on different time scales. We have carried out experiments on various ionic (anionic as well as cationic) micelles with varied counterion concentrations, vesicles, and lipid bilayers to unravel the complex dynamic features present in these systems.



6/2020

Electroresponsive microspheres containing nanosilica and graphene oxide (GO) sheets have been achieved by the one-step evaporation induced assembly of mixed colloids using spray drying. The presence of GO sheets arrests the buckling of the drying droplets during evaporative assembly and results in well-defined spherical shaped grains. A plausible mechanism for the formation of silica-GO binary composite microspheres is elucidated. It has been established that the adsorbed water in the microspheres plays a profound role as far its electroresponsivebehavior is concerned. GO sheets in the microspheres allow for tuning of electroresponse strength owing to the increased interaction of water molecules to the oxygen-containing functional groups anchored on the GO sheets.



6/2020

Electroresponsive microspheres containing nanosilica and graphene oxide (GO) sheets have been achieved by the one-step evaporation induced assembly of mixed colloids using spray drying. The presence of GO sheets arrests the buckling of the drying droplets during evaporative assembly and results in well-defined spherical shaped grains. A plausible mechanism for the formation of silica-GO binary composite microspheres is elucidated. It has been established that the adsorbed water in the microspheres plays a profound role as far its electroresponsivebehavior is concerned. GO sheets in the microspheres allow for tuning of electroresponse strength owing to the increased interaction of water molecules to the oxygen-containing functional groups anchored on the GO sheets.



5/2020

Polymer nanoparticles formed from polymers with biodegradable and biocompatible properties are promising candidates for biomedical applications. Herein, the role of different physicochemical parameters associated with the formation of hydrophobic [Poly(lactic-co-glycolic acid) (PLGA) and Polycaprolactone (PCL)] and amphiphilic [Poly(ethylene glycol) methyl ether-block-poly(l-lactide-co-glycolide) (PEG-PLGA)] polymer nanoparticles has been studied by Small-Angle Neutron Scattering (SANS). We show that the changes in size and the number density of hydrophobic polymer nanoparticles are associated with the polymer concentration or solvent-to-nonsolvent ratio or the synergetic effect of these parameters. The distinct difference in the formation mechanism of the hydrophobic and amphiphilic polymers could be utilized for applications associated with the different length scales of nanoparticles.




Facilities

01-01-1990

Study of short and intermediate range order in glasses, liquids and disordered crystals.


01-01-1990

For the investigation of conduction properties of energy materials as a function of frequency, temperature, controlled gas environment, and magnetic field.


01-01-1990

For inelastic neutron scattering experiments from single crystals/ polycrystalline samples.


01-01-1990

Study of size/magnetization of magnetic domains or clusters at mesoscopic length scales.


01-01-1990

Based on four circle Eulerian geometry. Used for study of high precision 3D structure of materials.


01-01-1990

Study of magnetic ordering/phases in technologically important polycrystalline magnetic materials.


01-01-1990

Delineation of chemical and magnetic structure phase diagrams of poly-crystalline materials.


01-01-1990

For inelastic neutron scattering experiments from polycrystalline samples.


01-01-1990

Study of stochastic molecular motion in pico second time scales. It provides both time scale and geometry of motion.


01-01-1990

A medium resolution Small Angle Neutron Scattering (SANS) instrument used to study structural features in 20 nm to 1000 nm scale.


01-01-1990

Study of depth dependent magnetic properties of thin films and multilayers.


01-01-1990

SANS instrument is used to determine the structure and interactions at nanometre length scales.


01-01-1990

A multipurpose neutron beam line for varigated uses such as detector calibration, neutron radiography etc


01-01-1990

SSPD is developing two facilites at Apsara U Beam lines viz. (1) Single Crystal Alignment Facility and (2) Detector Test Facility


01-01-1990

Probe morphology of nanostructured materials in film as well as powder form along with elemental analysis of nanoparticles, alloys, porous materials, ceramics, polymers etc.


01-01-1990

Small and Wide Angle X-ray Scattering Beamline for study of structures at Mesoscopic length scale (1-100 nm), covering wide range of fields, including alloys, polymers, macromolecules, emulsions, porous materials, nanoparticles, soft-matter etc.


01-01-1990

12 Tesla Vibrating Sample Magnetometer (VSM) to study the magnetic properties of various technologically important materials.


01-01-1990

Raman spectroscopy of single crystals, polycrystals, 1D-2D materials, nanocrystals, glasses, liquids and for Surface Enhanced Raman Spectrometer


01-01-1990

Measures fluctuations in intensity auto correlations to determine the hydrodynamic size and diffusion of particles in a suspension.


01-01-1990

Instrument for studies of hyperfine interactions in Fe containing samples using Co-57 source (50 mCi)


01-01-1990

To measure the magneto-caloric properties of potential magnetic materials for magnetic refrigeration.


01-01-1990

9 Tesla Cryomagnet with following physical properties measurement options: Vibrating Sample Magnetometer (VSM), AC Susceptibility, Resistivity and Hall Effect, Heat Capacity,Thermal Transport, High Temperature VSM


01-01-1990

The 3-gun sputter up system has been designed to deposit large area thin films and multilayers of various materials (metals, semiconductors, oxides, dielectrics) which can be deposited independently or in combinations of up to three at a time.


01-01-1990

To grow the oxide single crystals using an optical floating zone technique employing four halogen lamps and ellipsoidal mirrors.


01-01-1990

Five Muffle furnaces with max temp1600-1700°C. One tube furnace with maximum Temperature - 1700 °C


01-01-1990

Electrical heating furnace with Ar, N2 , O2 Gas flow environment and maximum Temperature - 1700 °C


01-01-1990

Electrical heating furnace with ambient condition suitable for preparing oxide sample and annealing sealed samples. Maximum Temperature - 1700 °C.


01-01-1990

For soft matter systhesis this lab has equipments such as: Zetasizer, Autotitrator, Ultrasonicator bath, Centrifuge, Vortexer, Controlled Temperature Bath, Magnetic stirrer, pH meter etc.


01-01-1990

Used for polarization property measurements like ferroelectric hysteresis, leakage current, fatigue measurements, retention, and imprint measurements on the samples



Technologies Developed

(31-03-2020) Development of Cold Neutron Source


Optimisation of liquid hydrogen moderator chamber location and geometry has been done using Monte Carlo simulations. Mechanical Stress Analysis of Cold Source has been completed.



31-12-2019

Experimental setup for direct measurement of the magnetocaloric effect (MCE), namely adiabatic temperature change (ΔТ) has been designed.


01-01-1990

The detector development facility makes variety of neutron detectors for the neutron scattering facility of SSPD. The team has also made detectors of other types.


01-01-1990

Neutron scattering experiments needs: Motor Position Control, Front End Nuclear Electronics, Data Acquistion Systems, Sample Environment Facility to set Temperature and Magnetic feild and Experiment Control Software. There are several developmental activities on this front.



Show Cases

25-Mar-2021