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15 papers · 2 filters
Magnetic behavior of the spin-chain compounds,Ca3CuIrO6 and Ca3CuRhO6
S. Rayaprol, E. V. Sampathkumaran
The spin-chain compounds, Ca3CuIrO6 and Ca3CuRhO6, crystallizing in a K4CdCl6-derived monoclinic structure, are investigated by ac and dc magnetization, isothermal remnant magnetiz…
Resistivity and Thermoelectric power of NaxCoO2 (x =1.0, 0.7 and 0.6) system
H. Kishan, V. P. S. Awana, M. A. Ansari +8
Results of thermo-electric power (S) and electrical resistivity (r) measurements are reported on NaxCoO2 compounds with x = 1.0, 0.7 and 0.6. These are single-phase compounds cryst…
Particle-Hole Asymmetry in Doped Mott Insulators: Implications for Tunneling and Photoemission Spectroscopies
Mohit Randeria, Rajdeep Sensarma, Nandini Trivedi +1
In a system with strong local repulsive interactions it should be more difficult to add an electron than to extract one. We make this idea precise by deriving various exact sum rul…
Large magnetoresistance in the magnetically ordered state as well as in the paramagnetic state near 300 K in an intermetallic compound,Gd7Rh3
Kausik Sengupta, S. Rayaprol, E. V. Sampathkumaran
We report the response of electrical resistivity to the application of magnetic fields (H) up to 140 kOe in the temperature interval 1.8-300 K for the compound, Gd7Rh3, orderin…
Large magnetoresistance anomalies in Dy7Rh3
Kausik Sengupta, S. Rayaprol, E. V. Sampathkumaran
The compound Dy7Rh3 ordering antiferromagnetically below (TN=) 59 K has been known to exhibit a temperature (T) dependent electrical resistivity (rho) behavior in the paramagnetic…
Pairing and superconductivity driven by strong quasiparticle renormalization in two-dimensional organic charge transfer salts
Jun Liu, Joerg Schmalian, Nandini Trivedi
We introduce and analyze a variational wave function for quasi two-dimensional kappa-ET organic salts containing strong local and nonlocal correlation effects. We find an unconvent…
Momentum anisotropy of the scattering rate in cuprate superconductors
A. Kaminski, H. M. Fretwell, M. R. Norman +12
We examine the momentum and energy dependence of the scattering rate of the high temperature cuprate superconductors using angle resolved photoemission spectroscopy. The scattering…
Novel magnetic behavior of single crystalline Er2PdSi3
K. K. Iyer, P. L. Paulose, E. V. Sampathkumaran +7
We report the results of ac and dc magnetic susceptibility (chi) and electrical resistivity (rho) measurements on the single crystals of Er2PdSi3, crystallizing in an AlB2-derived…
Electrical resistivity and tunneling anomalies in CeCuAs2
E. V. Sampathkumaran, T. Ekino, R. A. Ribeiro +9
The compound CeCuAs2 is found to exhibit negative temperature (T) coefficient of electrical resistivity (rho) under ambient pressure conditions in the entire T-range of investigati…
Heat-capacity anomalies in the presence of high magnetic fields in the spin-chain compound, Ca3Co2O6
E. V. Sampathkumaran, Z. Hiroi, S. Rayaprol +1
Heat-capacity behavior in the presence of externally applied magnetic field (H) up to 140 kOe is investigated (2-35 K) for the quasi-1-dimensional compound, Ca3Co2O6, believed to o…
High pressure effects on the electrical resistivity behavior of the Kondo lattice, YbPd2Si2
T. Nakano, M. Hedo, Y. Uwatoko +1
We report the influence of external pressure (P= up to 8 GPa) on the temperature dependence of electrical resistivity of a Yb-based Kondo lattice, YbPd2Si2, which does not undergo…
Magnetic behavior of Co ions in the exotic spin-chain compound,Ca3Co2O6, from 59Co NMR studies
E. V. Sampathkumaran, N. Fujiwara, S. Rayaprol +2
We have performed field-swept 59Co NMR measurements on the 'exotic' spin-chain material, Ca3Co2O6, crystallizing in K4CdCl6-type rhombohedral structure, believed to exhibit two mag…
Magnetic behavior of spin-chain compounds, Sr3ZnRhO6 and Ca3NiMnO6, from heat capacity and ac susceptibility studies
S. Rayaprol, Kausik Sengupta, E. V. Sampathkumaran +1
Heat-capacity (C) and ac susceptibility measurements have been performed on the spin-chain compounds, Sr3ZnRhO6 and Ca3NiMnO6, to establish their magnetic behavior and to explore w…
Magnetic, electrical resistivity, heat-capacity and thermopower anomalies in CeCuAs2
Kausik Sengupta, E. V. Sampathkumaran, T. Nakano +9
The results of magnetic susceptibility, electrical resistivity (), heat-capacity (C) and thermopower (S) measurements on CeCuAs2, forming in ZrCuSi2-type tetragonal structure, a…
Testing for topological order in variational wavefunctions for Z(2) spin liquids
Arun Paramekanti, Mohit Randeria, Nandini Trivedi
We determine the conditions under which a spin-liquid Mott insulator |0> defined by a Gutzwiller projected BCS state at half-filling is Z(2) fractionalized. We construct a trial vi…