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Department of

Photo of Srinivasan  Ramakrishnan

Srinivasan Ramakrishnan

Distinguished Professor Emeritus and Raja Ramanna Fellow


Strongly correlated electrons in superconductivity, magnetism and charge density wave; their coexistence and competition; Unconventional superconductivity in low carrier systems/ topological semimetals


Srinivasan Ramakrishnan obtained (First rank) his BSc (Applied Sciences) degree from the P.S. G. College of Technology (University of Madras) , Coimbatore, Masters from IIT Madras, and PhD Tata Institute of Fundamental Research Mumbai in 1985.  From 1985-2021, he was a faculty member in the Department of Condensed Matter Physics and Materials Science at TIFR  Mumbai and retired as a director of TIFR in June 2022. He joined IISER Pune in July 2022.

Prof. Ramakrishnan’s interest is in condensed matter physics at very low temperatures.  He has worked in the areas of superconductivity, magnetism and charge density waves in a variety of rare earth intermetallic compounds with a view to understanding multiple phase transitions exhibited by them.


Superconductivity, magnetism and charge density wave ordering in rare earths and actinides

Prof. Ramakrishnan’s current research interests are mainly in the study of superconductivity in low carrier systems. Recently, he and co-workers established the superconductivity of pure BI at 0.53 mK which has the lowest carrier concentration and yet shows bulk superconductivity due to unconventional pairing of electrons. He is also interested in superconductivity displayed by Kagome topological materials.  

Selected Publications

Prakash, O., Kumar, A., Thamizhavel, A., Ramakrishnan, S. (2017):  Evidence for bulk superconductivity in pure bismuth single crystals at ambient pressure. Science 355, 52–55 (2017). 

Ramakrishnan, S., van Smaalen, S. (2017): Unusual ground states in R5Ir4Si10 (R  =  rare earth; T  =  Rh, Ir; and X  =  Si, Ge, Sn): A review. Rep. Prog. Phys. 80, 116501.

Joshi, B., Thamizhavel, A., Ramakrishnan, S. (2011): Superconductivity in non-centrosymmetric BiPd. Phys. Rev. B 84, 064518 (7 pp.).

Naren, H. R., Thamizhavel, A., Nigam, A. K., Ramakrishnan, S. (2008): Strongly Correlated Superconductivity in Rh17S15 . Phys. Rev. Lett. 100, 026404.

Tomuta, D. G., Ramakrishnan, S., Nieuwenhuys, G. J., Mydosh, J. A. (2001): The magnetic susceptibility, specific heat and dielectric constant of hexagonal YMnO3, LuMnO3 and ScMnO3. J. Phys.: Condens. Matter 13, 4543-4552.

Galli. F., Ramakrishnan, S., Taniguchi, T., Nieuwenhuys, G. J., Mydosh, J. A., Geupel, S., Lüdecke, J., van Smaalen, S. (2000): Charge-Density-Wave Transitions in the Local-Moment Magnet: Er5 Ir4 Si10 Phys. Rev. Lett. 85, 158-161.

Becker, B., Patil, N. G., Ramakrishnan, S., Menovsky, A. A., Nieuwenhuys, G. J., Mydosh, J. A., Kohgi, M., Iwasa, K. (1999): Strongly coupled charge-density wave transition in single-crystal Lu5Ir4Si10. Phys. Rev. B 59, 7266-7299. 

Ghosh, K., Ramakrishnan, S., Grover, A.  K., Menon, G. I., Chandra, G., Chandrasekhar Rao, T. V., Mishra, P. K., Ravikumar,  G., Sahni, V. C., Tomy, C. V., Balakrishnan, G., Mck Paul, D., Bhattacharya, S. (1996): Reentrant peak effect and melting of a flux line lattice in 2H-NbSe2. Phys. Rev. Lett. 76, 4600-4603.