My principal research interest is the investigation of materials with novel physical properties like superconductivity, ferroelectricity, ferromagnetism, multiferroicity etc. using scanning probe microscopy and transport spectroscopy at low temperatures and high magnetic fields. In superconductors, I study the nature of the superconducting gap(s) by point-contact spectroscopy and scanning tunneling microscopy at low temperatures. I also investigate the physics of the magnetic vortices in unconventional superconductors by magnetic force microscopy at low temperatures and in magnetic fields. Using these techniques one can also probe the ferromagnetic and ferroelectric materials.
Multiferroics are the materials where more than one type of physical order exists (for example, ferroelectricity and ferromagnetism). I study the coupling between different order parameters in the naturally occurring multiferroics as well as in the artificial multiferroics where two different materials exhibiting two different order parameters are artificially integrated using a combination of thin film deposition and lithographic techniques.
- Phase-Incoherent Superconducting Pairs in the Normal State of Ba(Fe1-xCox)2As2. Goutam Sheet, Manan Mehta, D. A. Dikin, S. Lee, C. W. Bark, J. Jiang, J. D. Weiss, E. E. Hellstrom, M. S. Rzchowski, C. B. Eom, and V. Chandrasekhar Phys. Rev. Lett. 105, 167003 (2010).
- dc and High Frequency Magnetic Properties of Nano-patterned CoFe2O4 Arrays Fabricated Using Sol-gel Precursors. Goutam Sheet, Alexandra R. Cunliffe, Erik J. Offerman, Chad M. Folkman, Chang-Beom Eom, and Venkat Chandrasekhar, J. App. Phys. 107, 104309 (2010).
- Comment on "Spectroscopic Evidence for Multiple Order Parameters in the Heavy Fermion Superconductor CeCoIn5". Goutam Sheet and Pratap Raychaudhuri, Phys. Rev. Lett. 96, 259701 (2006).
- High spin polarization in the ferromagnetic filled skutterudites KFe4Sb12 and NaFe4Sb12. Goutam Sheet H. Rosner, S. Wirth, A. Leithe-Jasper, W. Schnelle, U. Burkhardt, J. A. Mydosh, P. Raychaudhuri, and Yu. Grin
Phys. Rev. B 72, 180407 (2005).
- Evidence of Gap Anisotropy in Superconducting YNi2B2C Using Directional Point-Contact Spectroscopy. P. Raychaudhuri, D. Jaiswal-Nagar, Goutam Sheet, S. Ramakrishnan, and H. Takeya
Phys. Rev. Lett. 93, 156802 (2004).