Superconductivity: Materials and Dissipation Physics

Superconductivity: Materials and Dissipation Physics

Superconductivity: Materials and Dissipation Physics

Activities :
Facilities
People:

Scientists:

Dr. VPS Awana
Dr. Anurag Gupta
Dr. Sudhir Husale
Dr. Ajeet Kumar

 

awana@nplindia.org
anurag@nplindia.org
husalesc@nplindia.org
kumarajeet@nplindia.org

Technical

Ms. Mandeep Kaur

Superconductivity : Materials and Dissipation Physics

Research Activities

Nanodevice research lab Squid magnotometer Lab Superconducting Materials Lab
Research: In order to explore and understand electronic, magnetic and photonic properties of new novel materials, in particular superconducting thin films, nanowires and nanolayers of layered materials, we fabricate nanostructures/nanodevices by using state of the art lithography tools such as focused ion beam microscope and ebeam lithography. Successful creation of these nanodevices gives access to many novel experiments and we investigate them at the nanoscale level. Research: Study of flux line motion, pinning and critical current density in superconductor based (nano) powders, thin films/ heterostructres/ devices, single crystals and bulk. To develop measurement setups involving low temperatures and high magnetic fields. Operation of a SQUID magnetometer (MPMS, T=1.8–400 K & B=0–7 T) capable of high resolution dc-magnetization, squid-based ac susceptibility and electrical transport measurements. Research: Search for new superconductors is the main duty of the superconducting materials activity. The program is supported by DAE-SRC Outstanding Investigator Award scheme. Most of the superconducting materials starting from BCS type (MgCNi3, Bi3Ni, Nb and NbN etc.) to High Tc cuprates including LSCO, YBCO, BISSCO, the Borides MgB2 and recently invented Fe based Pnictides (REFeAsO/F) and chalcegonides (FeTe/Se) are synthesized and studied in detail for their superconducting properties. The superconducting materials group is credited with starting of Fe based superconductors research in country [Current Sci. 20, 95 (2008)]. Very recently, the group has contributed significantly to the discovery of BiS2 based new superconductors [J. Am. Chem. Soc 134, 16504 (2012)].

Superconductivity : Materials and Dissipation Physics

Facilities

  • A combined focused ion beam microscope (Auriga, Zeiss) : This is a unique microscope, can be used for high resolution imaging (FESEM), localized metal or insulator deposition, elemental identification (Energy dispersive spectrometry, EDS), analysis of crystalline microstructures by electron backscatter diffraction (EBSD), micromanipulation of objects by micromanipulators (Kleindiek, nanotechnic), localized milling / circuit modifications by using Ga+ ion beam, and Raith attachment for the ebeam pattern writings.


Fig: A combined Focused ion beam microscope



  • Oxygen plasma system (Europlasma): Facility for the substrate activation, cleaning and resist stripping







  • Olympus Industrial Inspection microscope: Detection and visualization of nanolayers of superconducting films, layered materials and fabricated structures.

  • Sputter coater: For the fabrication of high quality superconducting thin films.






  • Other facilities include fume hood, spin coaters, micro centrifuge, source meters, temp controlled hot plates, oven and ultrasonicator.

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