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17 papers · 2 filters
Zero temperature dynamics of the Hubbard model in infinite dimensions: A local moment approach
Himadri Barman
The local moment approach (LMA) has presented itself as a powerful semi-analytical quantum impurity solver (QIS) in the context of the dynamical mean-field theory (DMFT) for the pe…
Observation and Structural Control of Charge-Density-Waves resonating with Terahertz Frequencies in NdNiO3
Rakesh Rana, Parul Pandey, S. S. Prabhu +1
Formation of charge-density-waves in ordered electronic phases (such as charge-order) is an emergent phenomenon in the perovskite class of correlated oxides. This scenario is visua…
Quantum Criticality in the 122 Iron Pnictide Superconductors Emerging from Orbital-Selective Mottness
S. D. Das, M. S. Laad, L. Craco +3
The twin issues of the nature of the normal state and competing order(s) in the iron arsenides are central to understanding their unconventional, high-Tc superconductivity. We use…
RRhGe (R=Tb, Dy, Er, Tm): An experimental and theoretical study
Sachin Gupta, K. G. Suresh, A. K. Nigam +1
RRhGe (R=Tb, Dy, Er, Tm) compounds have been studied by a number of experimental probes and theoretical ab initio calculations. These compounds show very interesting magnetic and e…
Crystal growth and magnetic properties of equiatomic CeAl
Pranab Kumar Das, A. Thamizhavel
Single crystal of CeAl has been grown by flux method using Ce-Al self-flux. Several needle like single crystals were obtained and the length of the needle corresponds to the [001]…
Experimental Evidences of Quantum Phase Transition in a Spin Cluster Compound
Tanmoy Chakraborty, Harkirat Singh, Chiranjib Mitra
Experimental realization of magnetic field induced quantum phase transition (QPT) is reported for NH4CuPO4.H2O, a two spin cluster material with isotropic Heisenberg interaction. E…
Magnetic and dielectric behavior of the spin-chain compound Er2BaNiO5 well below its Néel temperature
Tathamay Basu, Kiran Singh, N. Mohapatra +1
We have recently reported that the Haldane spin-chain system, Er2BaNiO5, undergoing antiferromagnetic order below 32 K, is characterized by the onset of ferroelectricity near 60K d…
Anisotropic magnetodielectric coupling behavior of Ca3Co1.4Rh0.6O6 due to geometrically frustrated magnetism
Tathamay Basu, Kartik K. Iyer, Kiran Singh +3
We have investigated the magnetic, dielectric and magnetodielectric (MDE) behavior of a geometrically frustrated spin-chain system, Ca3Co1.4Rh0.6O6, in the single crystalline form…
Effect of Zn doping on the Magneto-Caloric effect and Critical Constants of Mott Insulator MnV2O4
Prashant Shahi, Harishchandra Singh, A. Kumar +5
X-ray absorption near edge spectra (XANES) and magnetization of Zn doped MnV2O4 have been measured and from the magnetic measurement the critical exponents and magnetocaloric effec…
Resonating valence-bond physics on the honeycomb lattice
Pranay Patil, Ishita Dasgupta, Kedar Damle
We study bond and spin correlations of the nearest-neighbour resonating valence bond (RVB) wavefunction for a SU() symmetric antiferromagnet on the honeycomb lattice. We…
Electronic inhomogeneities in the superconducting phase of CaFe1.96Ni0.04As2 single crystals
Anirban Dutta, Neeraj Kumar, A. Thamizhavel +1
Superconductivity in Iron-Arsenic based pnictides emerges in close proximity to an antiferromagnetic (AFM)ordered parent state and the AFM phase overlaps with superconducting (SC)…
Role of trap-induced scales in non-equilibrium dynamics of strongly interacting trapped bosons
Anirban Dutta, Rajdeep Sensarma, K. Sengupta
We use a time-dependent hopping expansion technique to study the non-equilibrium dynamics of strongly interacting bosons in an optical lattice in the presence of a harmonic trap ch…
A reentrant phenomenon in magnetic and dielectric properties of Dy2BaNiO5 and an intriguing influence of external magnetic field
Tathamay Basu, P. L. Paulose, Kartik K Iyer +5
We report that the spin-chain compound Dy2BaNiO5 recently proven to exhibit magnetoelectric coupling below its Neel temperature (T_N) of 58 K, exhibits strong frequency-dependent b…
SR and inelastic neutron scattering investigations of the noncentrosymmetric antiferromagnet CeNiC
A. Bhattacharyya, D. T. Adroja, A. M. Strydom +6
The magnetic state of the noncentrosymmetric antiferromagnet CeNiC has been studied by magnetic susceptibility, heat capacity, muon spin relaxation (SR) and inelastic neutro…
Magnetic order in the frustrated Ising-like chain compound SrNiIrO
Emilie Lefrançois, Laurent C. Chapon, Virginie Simonet +6
We have studied the field and temperature dependence of the magnetization of single crystals of Sr3NiIrO6. These measurements evidence the presence of an easy axis of anisotropy an…
Anisotropic magnetic properties and giant magnetocaloric effect of PrSi single crystal
Pranab Kumar Das, Amitava Bhattacharyya, Ruta Kulkarni +2
Single crystal of PrSi was grown by Czochralski method in a tetra-arc furnace. Powder x-ray diffraction of the as grown crystal revealed that PrSi crystallizes in FeBtype struct…
Low temperature ordering in easy-axis kagome and triangular lattice antiferromagnets
K. Damle
A brief review is provided of earlier work on the low temperature phases of kagome and triangular lattice antiferromagnets in which there is sufficiently strongly single-ion…