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28 papers · 2 filters
Neel to staggered dimer order transition in a generalized honeycomb lattice Heisenberg model
Argha Banerjee, Kedar Damle, Arun Paramekanti
We study a generalized honeycomb lattice spin-1/2 Heisenberg model with nearest-neighbor antiferromagnetic 2-spin exchange, and competing 4-spin interactions which serve to stabili…
Impurity spin texture at a Néel-Valence Bond Solid critical point in SU(3) quantum antiferromagnets
Argha Banerjee, Kedar Damle, Fabien Alet
We study the impurity physics at a continuous quantum phase transition from an SU(3) symmetric Néel ordered state to a valence bond solid state that breaks lattice symmetries, usin…
Effect of Si and Ga substitutions on the magnetocaloric properties of NiCoMnSb quaternary Heusler alloys
Roshnee Sahoo, Ajaya K. Nayak, K. G. Suresh +1
The effect of Si and Ga substitutions on the magnetic and the magnetocaloric properties in Heusler based system Ni46Co4Mn38Sb12-xZx (Z=Si and Ga) has been studied. From the M(T) pl…
Structure, Transport and Magnetic properties in LaSrCoRuO
P. S. R. Murthy, K. R. Priolkar, P. A. Bhobe +3
The perovskite solid solutions of the type LaSrCoRuO with 0.25 x 0.75 have been investigated for their structural, magnetic an…
Effect of B-site Dopants on Magnetic and Transport Properties of LaSrCoRuO
P. S. Ramu Murthy, K. R. Priolkar, P. A. Bhobe +3
Effect of Co, Ru and Cu substitution at B and B' sites on the magnetic and transport properties of LaSrCoRuO have been investigated. All the doped compositions crystallize in t…
Magnetic properties of the heavy fermion antiferromagnet CeMg
Pranab Kumar Das, Neeraj Kumar, R. Kulkarni +1
We have grown the single crystals of CeMg and its non-magnetic analogue LaMg, which crystallize in the cubic crystal structure with the space group \textit{Fm\rm{\={3}}m},…
Antiferromagnetic ordering in EuPtGe single crystal
Neeraj Kumar, Pranab Kumar Das, Ruta Kulkarni +3
The magnetic properties of single crystalline EuPtGe, crystallizing in the non-centrosymmetric BaNiSn-type crystal structure, have been studied by means of magnetisation, e…
Effect of chemical substitution in Rh17S15
H. R. Naren, Tamizhavel Arumugam, S. Ramakrishan
Rh17S15 has recently been shown to be a strongly correlated superconductor with a transition temperature of 5.4 K. In order to understand the nature of strong correlations we study…
Unusual Coupling Between Field-induced Spin Fluctuations and Spin Density Wave in Intermetallic CeAg2Ge2
D. K. Singh, A. Thamizhavel, S. Chang +4
We report on the experimental evidences for an unusual coupling between the magnetic field- induced fluctuations of correlated Ce-ions coinciding with the discontinuous movement of…
Disorder Induced Negative Magnetization in LaSrCoRuO6
P. S. R. Murthy, K. R. Priolkar, P. A. Bhobe +3
This paper reports effect of thermally induced disorder on the magnetic properties of LaSrCoRuO6 double perovskite. While the ordered sample is antiferromagnetic, the disordered sa…
Observation of spontaneous magnetization jump and field-induced irreversibility in Nd5Ge3
Bibekananda Maji, K. G. Suresh, A. K. Nigam
We report the observation of spontaneous and ultra-sharp jumps in the low temperature magnetization isotherms of polycrystalline Nd5Ge3. Field-induced and ultra-sharp jumps are als…
Fractional spin textures in the frustrated magnet SrCrGaO
Arnab Sen, Kedar Damle, Roderich Moessner
We consider the archetypal frustrated antiferromagnet SrCrGaO in its well-known spin-liquid state, and demonstrate that a Cr spin ion in dire…
Observation of re-entrant spin glass behavior in (Ce1-xErx)Fe2 compounds
Arabinda Haldar, K. G. Suresh, A. K. Nigam
Clear experimental evidence of re-entrant spin glass state has been revealed in Er doped CeFe2 compounds. The zero field cooled - field cooled bifurcation in dc magnetization, freq…
Generalization of the singlet sector valence bond loop algorithm to antiferromagnetic ground states with total spin
Argha Banerjee, Kedar Damle
We develop a generalization of the singlet sector valence bond basis projection algorithm of Sandvik, Beach, and Evertz (A. W. Sandvik, Phys. Rev. Lett. 95, 207203 (2005); K. S. D.…
Giant inverse magnetocaloric effect near room temperature in Co substituted NiMnSb Heusler alloys
Ajaya K Nayak, K G Suresh, A K Nigam
The effect of Co on the structural, magnetic and magnetocaloric effect (MCE) of Ni50-xCoxMn38Sb12 (x=0,2,3,4,5) Heusler alloys was studied. Using x-ray diffraction, we show the evo…
Observation of enhanced exchange bias behavior in NiCoMnSb Heusler alloys
Ajaya K. Nayak, K. G. Suresh, A. K. Nigam
We report the observation of large exchange bias in Ni50-xCoxMn38Sb12 Heusler alloys with x=0, 2, 3, 4, 5, which is attributed to the coexistence of ferromagnetic and antiferromagn…
Pressure induced magnetic and magnetocaloric properties in NiCoMnSb Heusler alloy
Ajaya K. Nayak, K. G. Suresh, A. K. Nigam +2
The effect of pressure on the magnetic and the magnetocaloric properties around the martensitic transformation temperature in NiCoMnSb Heusler alloy has been studied. The martensit…
Irreversibility of field-induced magnetostructural transition in NiCoMnSb shape memory alloy revealed by magnetization, transport and heat capacity studies
Ajaya K. Nayak, K. G. Suresh, A. K. Nigam
The effects of magnetic field on the martensitic transition have been studied in Ni45Co5Mn38Sb12. We find a large field-induced irreversibility in this system, as revealed by the f…
Fractional quantum Hall edge: Effect of nonlinear dispersion and edge roton
Shivakumar Jolad, Diptiman Sen, Jainendra K. Jain
According to Wen's theory, a universal behavior of the fractional quantum Hall edge is expected at sufficiently low energies, where the dispersion of the elementary edge excitation…
Magnetization jumps and relaxation effect in doped CeFe2
Arabinda Haldar, K. G. Suresh, A. K. Nigam
For the first time, we find that the dynamic antiferromagnetic phase present in CeFe2 gets stabilized with Ga and Si substitutions. We find that phenomena such as strain-induced fi…
Magnetostructural transition in Ce(Fe0.975Ga0.025)2 compound
Arabinda Haldar, Niraj K. Singh, Ya. Mudryk +4
The magnetic and magnetostructural properties of the polycrystalline Ce(Fe0.975Ga0.025)2 have been investigated as a function of temperature and magnetic field. In Ce(Fe0.975Ga0.02…
Metastable magnetization behavior in magnetocaloric R6Co1.67Si3 (R=Tb and Nd) compounds
Arabinda Haldar, Niraj K. Singh, K. G. Suresh +1
Magnetic field and time induced steps have been observed in the recently discovered ternary silicide R6Co1.67Si3. Huge relaxation steps are observed across different loops in the l…
Stabilization of antiferromagnetism in CeFe2 alloys: Effects of chemical and hydrostatic pressure
Arabinda Haldar, K. G. Suresh, A. K. Nigam +2
Effects of Al, Mn and Sb dopings in CeFe2 and effect of applied pressure have been investigated. Al doping gives rise to the FM-AFM transition and a reduction in the magnetic momen…
Temperature and magnetic field induced structural transformation in Si doped CeFe2: in-field x-ray diffraction study
Arabinda Haldar, Niraj K. Singh, Ya. Mudryk +3
Using x-ray powder diffraction technique at various temperatures and applied magnetic fields, we have studied the magnetostructural properties of Ce(Fe0.95Si0.05)2. The x-ray diffr…