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Ultralow Thermal Conductivity and Thermoelectric Properties of Bi4GeTe7 with an Intrinsic van der Waal Heterostructure
Niraj Kumar Singh, Ankit Kashyap, Ajay Soni
Ternary chalcogenides, having large crystalline unit cell and van der Waal stacking of layers, are expected to be poor thermal conductors and good thermoelectric (TE) materials. We…
Electron-Phonon Coupling and Quantum Correction to Topological Magnetoconductivity in Bi2GeTe4
Niraj Kumar Singh, Divya Rawat, Dibyendu Dey +5
We report on structure, vibrational properties and weak-antilocalization-(WAL-) induced quantum correction to magnetoconductivity in single crystal Bi2GeTe4. Surface band structure…
Multiple magnetic transitions and magnetocaloric effect in Gd1-xSmxMn2Ge2 compounds
Pramod Kumar, Niraj K. Singh, K. G. Suresh +2
Magnetic and magnetocaloric properties of polycrystalline samples of Gd1-xSmxMn2Ge2 have been studied. All the compounds except GdMn2Ge2 show re-entrant ferromagnetic behavior. Mul…
Heat capacity and magnetocaloric effect in polycrystalline Gd1-xSmxMn2Si2
Pramod Kumar, Niraj K. Singh, K. G. Suresh +2
We report the magnetocaloric effect in terms of isothermal magnetic entropy change as well as adiabatic temperature change, calculated using the heat capacity data. Using the zero…
Role of coexisting ferromagnetic and antiferromagnetic phases on the magnetocaloric effect in metamagnetic Tb2Ni2Sn
Pramod Kumar, Niraj K. Singh, K. G. Suresh +1
We report the anomalous magnetocaloric behavior in the polycrystalline compound Tb2Ni2Sn. The magnetization measurements show that this compound shows multiple magnetic transitions…
Correlation between magnetism and magnetocaloric effect in RCo2-based Laves phase compounds
Niraj K. Singh, K. G. Suresh, A. K. Nigam +3
By virtue of the itinerant electron metamagnetism (IEM), the RCo2 compounds with R=Er, Ho and Dy are found to show first order magnetic transition at their ordering temperatures. T…