Prof. K.P. Ramesh

NMR/NQR in solids, Glasses and Glass ceramics, Conducting polymers, Ferroelectric and Antiferroelectric (FE and AFE) mixed systems, Optical, Dielectric and Magnetic Resonance studies in Nd³⁺ doped glasses, Zero field NMR in Lanthanum Manganite systems, Low frequency NQR for detection of explosives.

Office phone : 080 - 2293 3335

Lab Phone : 080 - 2293 2722

email : kpramesh@physics.iisc.ernet.in

URL : http://www.physics.iisc.ernet.in/~kpramesh

Research Interests

Glasses and glass ceramics.

Conducting and semi conducting Polymers.

FE+AFE proton glasses.

NMR/NQR instrumentation.

Zero Field NMR and low frequency NQR.

Selected Papers

Study of the effect of alkali mixture on V-O bond length in Oxyfluoro Vanadate

glasses using Raman spectroscopy

Gajanan V. Honnavar, Prabhava S. N, K.P. Ramesh

Journal of Non-Crystalline Solids 370, 6–9, (2013).

Role of carrier density and disorder on anisotropic charge transport in polypyrrole

Vaibhav Varade, P. Anjaneyulu, C. S. Suchand Sangeeth, K. P. Ramesh and Reghu Menon.

J. Appl. Phys. 113, 023708 (2013).

³⁵Cl NQR frequency and spin lattice relaxation time in 3, 4 -dichlorophenol as a function

Pressure and temperature.

L.Ramu, K.P.Ramesh and R.Chandramani

Magn. Reson. Chem. 51, 4-8 , (2013).

“Correlated conformation and charge transport in mutiwall carbon nanotube –

conducting polymer nanocomposites”

Paramita Kar Choudhury, S. Ramaprabhu, K. P. Ramesh and Reghu Menon.

J. Phys.: Condens. Matter 23, 265303, (2011).

Optical absorption and photoluminescence studies of Nd3+ doped alkali boro

germanate glasses

Sunil Kumar S, Jayakrishna Khatei , S. Kasthurirengan, K.S.R. Koteswara Rao , K.P. Ramesh.

Journal of Non-Crystalline Solids. 357, 842–846, (2011).

NMR relaxation study of disorder in the mixed system BPxGPI(1-x) and the low

Temperature transition from classical to quantum rotation.

M.N. Ramanuja, K.P. Ramesh and J. Ramakrishna.

Mol. Phys. 107 (7) , 643 – 652, (2009).

¹H and ¹⁹F NMR relaxation time studies in (NH₄)₂ZrF₆ superionic conductor

K.J. Mallikarjunaiah, K.P. Ramesh and R. Damle

Applied Magnetic Resonance 35(3), 449 – 458, (2009).

¹H NMR study of internal motions and quantum rotational tunneling in (CH₃)₄NGeCl₃

K.J. Mallikarjunaiah, K. Jugeshwar singh, K.P. Ramesh and R. Damle

Magn Reson. Chem. 46(2) 110-114, (2008).

Pressure and temperature dependence of Chlorine NQR in Caesium and Sodium chlorates.

K.P. Ramesh, K.S. Suresh, C.R.Raghavendra Rao and J. Ramakrishna,

Magn. Reson. Chem. 46(6) 525-533, (2008).

Study of molecular dynamics and cross relaxation in tetramethylammonium hexafluorophosphate

(CH₃)₄NPF₆ by ¹H and ¹⁹F NMR.

K.J. Mallikarjunaiah, R. Damle and K.P. Ramesh

Solid State Nuclear Magnetic Resonance 34, 180-185, (2008).

¹H NMR and charge transport in metallic polypyrrole at ultra low temperatures and high magnetic fields.

K.Jugeshwar Singh, W.G. Clark, K.P. Ramesh and Reghu Menon.

Journal of Physics : Condensed Matter, 20, 465208 (9pp), (2008).

Disorder in Condensed matter systems : Proton SLR study of the mixed systems of

Betaine Phosphate and Glycine Phosphate BP_xGPI_(1-x)

M. N. Ramanuja , K. P. Ramesh and J. Ramakrishna

Magn Reson. Chem. 45 (12), 1027-1034, (2007).

Study of molecular reorientation and quantum rotational tunneling in

Tetramethylammonium Selenate by ¹H NMR

K.J. Mallikarjunaiah, K. C. Paramita, K.P. Ramesh and R. Damle

Solid State Nuclear Magnetic Resonance 32, 11-15 (2007).

Synthesis, structural and transport properties of nanocrystalline La_(1-x)Ba_xMnO₃ (0.0<x<0.3) powders

M Nagabhushanaa, G.T. Chandrappaa, R.P. Sreekanth Chakradhar, K.P. Ramesh, C. Shivakumara.

Solid State Communications 136, 427–432. (2005).

¹¹ B NMR spin-lattice relaxation study in Nd ³⁺ doped binary alkali borate glasses : A

possible method to look at the environment of rare-earth sites in glasses.

Sutirtha Mukhopadhyay, K. P. Ramesh and J. Ramakrishna

Phys Rev. B 72, 054201 (2005).

Solution combustion derived nanocrystalline Zn₂ SiO₄ :Mn phosphors: A spectroscopic view

R. P. Sreekanth Chakradhar, B. M. Nagabhushana and G. T. Chandrappa,

K. P. Ramesh, J. L. Rao

J. Chem. Phys. 121 (20), 10250, ( 2004).

Rare-earth ion-assisted nuclear spin-lattice relaxation in Nd ³⁺ -doped

binary sodium borate glasses: ¹¹ B NMR study

Sutirtha Mukhopadhyay, K. P. Ramesh, Ramaswamy Kannan, and

J. Ramakrishna Phys. Rev. B 70, 224202 (2004).

Mixed alkali effect in borate glasses - EPR and optical band gap studies in

xNa₂O-(30-x)K₂O-70B₂O₃ glasses doped with Gd³⁺ ions.

R.P. Sreekanth Chakradhar, K.P. Ramesh, J.L. Rao and J. Ramakrishna.

Modern Physics Letters B 18, 83, (2004).

Proton NMR T₁ studies in Methyl ammonium trichloro Stannate (II) CH₃NH₃SnCl₃.

S. Senthil Kumaran, K.P. Ramesh, J. Ramakrishna.

Phase Transitions 75(6), 597, (2002).

³⁵Cl NQR studies of 1-Chloro-2,4 dinitrobenzene and 1,2-dichloro -3

nitrobenzene as a function of pressure and temperature.

J. Srinivas, R.K. Subramanian, K.P.Ramesh, J.Ramakrishna, K.S. Suresh

and C. Raghavendra Rao, Magn. Reson. in Chemistry 40, 337 (2002).

Pressure Dependence of the Chlorine NQR in Three Solid Chloro Anisoles.

K.S. Suresh, K.P. Ramesh, C. Raghavendra Rao and J. Ramakrishna,

Z. Naturforsch. 56a, 764, (2001).

Research Projects Undertaken

Spin and Charge dynamics in Conducting Polymers by NMR studies funded by DST –NSF S&T

Molecular Dynamics Including Rotational Tunneling in Polymers and Orientational Glasses

using NMR and INS DAE-BRNS

Design and development of NQR detection system for explosives.

Group

Collaborators

Prof. Reghu Menon
Prof. R. K. Damle

Prof. W. G. Clark

Technical support

Dr. M.N. Ramanuja. (Senior Scientific Officer)

Recent Ph.D. thesis awarded

Dr. K. Jugeshwar Singh

Dr. Paramita Kar Choudhury

Present students

Mr. S. Sunil Kumar

Mr. Vaibhav Varade

Mr. Gajanan Honnavar

Mr. B. M. Siddesh

Project Assistant

Venkataramana Avabhrath