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SPS organises a seminar by G. Vaitheeswaran

SPS organises a seminar by G. Vaitheeswaran

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SPS organises a seminar by G. Vaitheeswaran
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School of Physical Sciences

Jawaharlal Nehru University, New Delhi

 

 

Title : Is Cerium mono nitride a correlated metal?

 

Speaker: G. Vaitheeswaran

School of Physics, University of Hyderabad

 


Date:  27– November -2019

Time:   3:00 p.m, Wednesday  (*******Please note the unusual time*******)

Venue: Seminar Room, SPS

 

Abstract : The structural, electronic and lattice dynamics of cerium mono nitride are investigated using ab-initio density functional methods without special treatment for the 4f states. The 4f states are hence allowed to hope from site to site, without an on-site Hubbard U and contribute to the bonding, in a picture often referred to as itinerant. It is argued that this picture is appropriate for CeN at low temperatures, while the anomalous thermal expansion observed at elevated temperature indicated entropy-driven localization of the Ce-f electrons, similar to the behavior of elemental cerium. The itinerant picture could reproduce the experimental lattice constants, bulk modulus and compression curves. In addition the calculated elastic constants are found to be positive and larger in magnitude ruling out the possibility of intermediate valency. Under pressure CeN is predicted to undergo a simple (NaCl) ® (CsCl) like transition around 68 GPa with a considerable volume collapse. 

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Initially, established as a Centre for Chinese and Japanese Studies, it subsequently grew to include Korean Studies as well. At present there are eight faculty members in the Centre. Several distinguished faculty who have now retired include the late Prof. Gargi Dutt, Prof. P.A.N. Murthy, Prof. G.P. Deshpande, Dr. Nranarayan Das, Prof. R.R. Krishnan and Prof. K.V. Kesavan. Besides, Dr. Madhu Bhalla served at the Centre in Chinese Studies Programme during 1994-2006. In addition, Ms. Kamlesh Jain and Dr. M. M. Kunju served the Centre as the Documentation Officers in Chinese and Japanese Studies respectively.

The academic curriculum covers both modern and contemporary facets of East Asia as each scholar specializes in an area of his/her interest in the region. The integrated course involves two semesters of classes at the M. Phil programme and a dissertation for the M. Phil and a thesis for Ph. D programme respectively. The central objective is to impart an interdisciplinary knowledge and understanding of history, foreign policy, government and politics, society and culture and political economy of the respective areas. Students can explore new and emerging themes such as East Asian regionalism, the evolving East Asian Community, the rise of China, resurgence of Japan and the prospects for reunification of the Korean peninsula. Additionally, the Centre lays great emphasis on the building of language skills. The background of scholars includes mostly from the social science disciplines; History, Political Science, Economics, Sociology, International Relations and language.

Several students of the centre have been recipients of prestigious research fellowships awarded by Japan Foundation, Mombusho (Ministry of Education, Government of Japan), Saburo Okita Memorial Fellowship, Nippon Foundation, Korea Foundation, Nehru Memorial Fellowship, and Fellowship from the Chinese and Taiwanese Governments. Besides, students from Japan receive fellowship from the Indian Council of Cultural Relations.