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14 papers · 2 filters
Resonating valence bond wavefunctions and classical interacting dimer models
Kedar Damle, Deepak Dhar, Kabir Ramola
We relate properties of nearest-neighbour resonating valence bond (nnRVB) wavefunctions for spin systems on two dimensional bipartite lattices to those of fully-packed clas…
4f-hybridization effect on the magnetism of Nd2PdSi3, an anomalous magnetic compound
K. Mukherjee, Tathamay Basu, Kartik K. Iyer +1
Among the members of the series R2PdSi3 (R= Rare-earths), the magnetic behavior of the Nd compound is interesting in some respects. This compound is considered to order ferromagnet…
Contrasting magnetic behavior of fine particles of some Kondo Lattices
K. Mukherjee, Kartik K. Iyer, E. V. Sampathkumaran
We have investigated the magnetic behavior of ball-milled fine particles of well-known Kondo lattices, CeAu2Si2, CePd2Si2 and CeAl2, by magnetization and heat-capacity studies in o…
Isothermal magnetic entropy behavior in Tb5Si3: Sign reversal and non-monotonic variation with temperature, and implications
Niharika Mohapatraa, Sitikantha D. Das, K. Mukherjee +1
The magnetic entropy change (\DeltaS), a measure of the magnetocaloric effect, in Tb5Si3, a compound exhibiting unusual positive magnetoresistance following a magnetic-field-induce…
Evolution of a metastable phase with a magnetic phase coexistence phenomenon and its unusual sensitivity to magnetic field cycling in the alloys Tb5-xLuxSi3 (x <= 0.7)
K. Mukherjee, Kartik K. Iyer, E. V. Sampathkumaran
Recently, we reported an anomalous enhancement of the positive magnetoresistance beyond a critical magnetic field in Tb5Si3 in the magnetically ordered state, attributable to 'inve…
Magnetic behavior of bulk and fine particles of RCr2Si2C (R = La, Ce)compounds: possible magnetic ordering from Cr
K. Mukherjee, Kartik K. Iyer, E. V. Sampathkumaran
The magnetic behavior of the quaternary compounds, RCr2Si2C (R = La, Ce), has been investigated by magnetization (M) and heat-capacity (C) measurements (1.8-300 K) in the bulk poly…
Evolution of the Kondo resonance feature and its relationship to spin-orbit coupling across the quantum critical point in Ce2Rh{1-x}CoxSi3
Swapnil Patil, V. R. R. Medicherla, R. S. Singh +2
We investigate the evolution of the electronic structure of Ce2Rh{1-x}CoxSi3 as a function of x employing high resolution photoemission spectroscopy. Co substitution at the Rh site…
Anisotropic magnetic properties and superzone gap formation in CeGe single crystal
Pranab Kumar Das, Neeraj Kumar, R. Kulkarni +2
Single crystals of CeGe and its non-magnetic analogue LaGe have been grown by Czochralski method. CeGe compound crystallizes in the orthorhombic FeB-type crystal structure with the…
Field-effect modulation of conductance in VO2 nanobeam transistors with HfO2 as the gate dielectric
Shamashis Sengupta, Kevin Wang, Kai Liu +4
We study field-effect transistors realized from VO2 nanobeams with HfO2 as the gate dielectric. When heated up from low to high temperatures, VO2 undergoes an insulator-to-metal tr…
Vacancy-induced spin texture in a one dimensional Heisenberg antiferromagnet
Sambuddha Sanyal, Argha Banerjee, Kedar Damle
We study the effect of a missing spin in a one dimensional antiferromagnet with nearest neighbour Heisenberg exchange and six-spin coupling using Quantum Monte-…
Effect of Fe substitution on the magnetic, transport, thermal and magnetocaloric properties in Ni50Mn38-xFexSb12 Heusler alloys
Roshnee Sahoo, Ajaya K. Nayak, K. G. Suresh +1
The structural, magnetic, transport, thermal and magnetothermal properties of quaternary Heusler alloys Ni50Mn38-xFexSb12 have been studied. Powder x-ray diffraction and temperatur…
Enhanced electrical resistance at the field-induced magnetic transitions in some stoichiometric and nonstoichiometric Tb-based ternary germanides
K. Mukherjee, Kartik K Iyer, E. V. Sampathkumaran
We present the magnetic and transport behavior of some Tb compounds, viz., TbIrGe2, TbFe(0.4)Ge2, and TbCo(0.4)Ge2. The stoichoometric germanide TbIrGe2 exhibits at least two disti…
Transport and magnetic behavior under pressure and high-resolution photoemission studies of Ce2Rh(o.7)Co(0.3)Si3, an alloy on the verge of quantum critical point
K. Mukherjee, Kartik K Iyer, Swapnil Patil +2
We report the influence of external pressure on the temperature dependence of magnetization and electrical resistivity as well as high-resolution photoemission studies for an alloy…
Magnetism of fine particles of Kondo lattices, obtained by high-energy ball-milling
E. V. Sampathkumaran, K. Mukherjee, Kartik K Iyer +2
Despite intense research in the field of strongly correlated electron behavior for the past few decades, there has been very little effort to understand this phenomenon in nano par…