Shri Krishna Joshi obtained his BSc and MSc (Physics) degrees from Allahabad University. He was appointed as Lecturer in Physics at Allahabad University (1957). He started his research work in measurement of diffuse X-ray scattering from organic crystals for his doctoral degree with K Banerjee and received his DPhil degree (1962). In 1965 he went to USA as a Visiting Lecturer at the University of California, Riverside. Joshi returned in 1967 to join as a Professor of Physics at the University of Roorkee (now IIT Roorkee). In 1986, he was appointed as the Director of National Physical Laboratory (NPL) of CSIR, New Delhi and in 1991 as the Director General of CSIR. He received DSc (hc) from Kumaon University (1944); Kanpur University (1995); Banaras Hindu University (1996) and from University of Burdwan (2005).
Academic and Research Achievements: Joshi did his research on experimental study of diffuse X-ray scattering from organic crystals. This experimental work got him seriously interested in theoretical studies of lattice vibrations. In metals, the frequencies of lattice vibrations depend on the response of conduction electrons to ion motion, and he proposed a successful phenomenological model incorporating electron response. Lattice dynamics of d-electron metals like copper and nickel was worked out using a non-interacting s and d bands model. He started studies of electronic band structure using Korringa- Kohn- Rostoker method. The virtual crystal and the coherent potential approximation were used to calculate the electron states in a number of disordered binary alloys. His group investigated physical properties like electrical conductivity, Hall effect and surface segregation in disorderd binary alloys. Joshi also studied electron correlations in narrow band ferromagnets using the Hubbard model and its generalizations. He proposed a new variational method for the periodic Anderson model to study the ground state behaviour of heavy fermions and estimated the c-axis resistivity of cuprates in high temperature superconductors. Joshi studied transport of electrons in mesoscopic systems, particularly, the conductance of a single quantum dot and a double quantum dot system. He has published 190 papers and guided 20 PhD students.
Other Contributions: Professor Joshi was the first Chairman of the Board of Governors of IIT Roorkee. He is chair the Governing Councils of Institute of Mathematical Sciences, Chennai, Institute of Physics, Bhubaneswar, and is also Chairman of the Council of the Indian Association for Cultivation of Science, Kolkata. He is a member of the Scientific Advisory Committee to the Cabinet. As DG, CSIR he steered CSIR through the initial phase of economic liberalization in India.
Awards and Honours: Professor Joshi received SS Bhatnagar Prize (1972), Meghnad Saha Award (1974), KS Krishnan Memorial Lecture of INSA (1987), FICCI Award (1990), Padma Shri (1991), CV Raman Medal of INSA (1999) and Padma Bhushan (2003). He is a Fellow of the Indian Academy of Sciences, Bangalore (1974) (Vice-President, 1989-91), National Academy of Sciences (India), Allahabad (President, 2001-02) and the Academy of Sciences for the Developing World (TWAS). He is also a Foreign Member of the Russian Academy of Sciences. He was President, Indian Physics Association (1989-90), Materials Research Society (1995-97) and Indian Science Congress Association (1996-97). He was Secretary (1983-86); Foreign Secretary (1989-92) and President (1993-95) of INSA.