S. Ramasesha
Indian Institute of Science
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Featured researches published by S. Ramasesha.
Journal of the American Chemical Society | 2010
Thengarai S. Venkatakrishnan; Shaon Sahoo; Nicolas Bréfuel; Carine Duhayon; Carley Paulsen; Anne-Laure Barra; S. Ramasesha; Jean-Pascal Sutter
Nonconventional heptacoordination in combination with efficient magnetic exchange coupling is shown to yield a 1-D heteronuclear {Fe(II)Nb(IV)} compound with remarkable magnetic features when compared to other Fe(II)-based single chain magnets (SCM). Cyano-bridged heterometallic {3d-4d} and {3d-5d} chains are formed upon assembling Fe(II) bearing a pentadentate macrocycle as the blocking ligand with octacyano metallates, [M(CN)(8)](4-) (M = Nb(IV), Mo(IV), W(IV)). X-ray diffraction (single-crystal and powder) measurements reveal that the [{(H(2)O)Fe(L(1))}{M(CN)(8)}{Fe(L(1))}](infinity) architectures consist of isomorphous 1-D polymeric structures based on the alternation of {Fe(L(1))}(2+) and {M(CN)(8)}(4-) units (L(1) stands for the pentadentate macrocycle). Analysis of the magnetic susceptibility behavior revealed cyano-bridged {Fe-Nb} exchange interaction to be antiferromagnetic with J = -20 cm(-1) deduced from fitting an Ising model taking into account the noncollinear spin arrangement. For this ferrimagnetic chain a slow relaxation of its magnetization is observed at low temperature revealing a SCM behavior with Delta/k(B) = 74 K and tau(0) = 4.6 x 10(-11) s. The M versus H behavior exhibits a hysteresis loop with a coercive field of 4 kOe at 1 K and reveals at 380 mK magnetic avalanche processes, i.e., abrupt reversals in magnetization as H is varied. The origin of these characteristics is attributed to the combination of efficient {Fe-Nb} exchange interaction and significant anisotropy of the {Fe(L(1))} unit. High field EPR and magnetization experiments have revealed for the parent compound [Fe(L(1))(H(2)O)(2)]Cl(2) a negative zero field splitting parameter of D approximately = -17 cm(-1). The crystal structure, magnetic behavior, and Mossbauer data for [Fe(L(1))(H(2)O)(2)]Cl(2) are also reported.
Physical Review B | 1995
R. Chitra; Swapan K. Pati; H. R. Krishnamurthy; Diptiman Sen; S. Ramasesha
Using the density matrix renormalization group technique, we study the ground state phase diagram and other low-energy properties of an isotropic antiferromagnetic spin-half chain with both dimerization and frustration, i.e., an alternation
CrystEngComm | 2009
Sébastien Dhers; Shaon Sahoo; Jean-Pierre Costes; Carine Duhayon; S. Ramasesha; Jean-Pascal Sutter
\delta
Journal of Chemical Physics | 1993
D. S. Galvão; Z. G. Soos; S. Ramasesha; S. Etemad
of the nearest neighbor exchanges and a next-nearest-neighbor exchange
Physical Review B | 2001
C. Raghu; Indranil Rudra; Diptiman Sen; S. Ramasesha
J_2~
Journal of Physics: Condensed Matter | 1997
Swapan K. Pati; S. Ramasesha; Diptiman Sen
. For
Solid State Communications | 1993
Ram Seshadri; Amit Rastogi; S V Bhat; S. Ramasesha; C. N. R. Rao
\delta = 0
Journal of Physics C: Solid State Physics | 1979
P. R. Sarode; S. Ramasesha; W. H. Madhusudan; C. N. R. Rao
, the system is gapless for
International Journal of Quantum Chemistry | 1998
Y. Anusooya; A. Chakrabarti; Swapan K. Pati; S. Ramasesha
J_2J_{2c} ~
Inorganic Chemistry | 2008
Thengarai S. Venkatakrishnan; Cédric Desplanches; Raghunathan Rajamani; Philippe Guionneau; Laurent Ducasse; S. Ramasesha; Jean-Pascal Sutter
where
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Jawaharlal Nehru Centre for Advanced Scientific Research
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