32 citations · 221 across the 17 of their papers we have counts for
17 papers
Hidden Quantum State and Signature of Mott Transition in Two-dimensional 1T-TaS2
Vivek Kumar, Birender Singh, Pradeep Kumar
Here we report a comprehensive inelastic light scattering studies on 1T-TaS2 with different thickness. This compound is well known for its rich charge density wave phases. Along wi…
Realization of Z Topological Metal in Single-Crystalline Nickel Deficient NiVSe
Sitaram Ramakrishnan, Shidaling Matteppanavar, Andreas Schonleber +6
Temperature-dependent electronic and magnetic properties are reported for a Z2 topological metal single-crystalline nickel-deficient NiVSe. It is found to crystallize in th…
Fluctuating Fractionalized Spins in Quasi Two-dimensional Magnetic V0.85PS3
Vivek Kumar, Deepu Kumar, Birender Singh +5
Quantum spin liquid (QSL), a state characterized by exotic low energy fractionalized excitations and statistics is still elusive experimentally and may be gauged via indirect exper…
Orthorhombic charge density wave on the tetragonal lattice of EuAl4
Sitaram Ramakrishnan, Surya Rohith Kotla, Toms Rekis +13
EuAl4 possesses the BaAl4 crystal structure type with tetragonal symmetry I4/mmm. It undergoes a charge-density-wave (CDW) transition at TCDW = 145 K and it features four consecuti…
Davydov Splitting, Resonance Effect and Phonon Dynamics in CVD grown Layered MoS2
Deepu Kumar, Birender Singh, Rahul Kumar +2
We present a comprehensive temperature dependent Raman measurements for horizontally aligned CVD grown layered MoS2 in a temperature range of 4 to 330 K under resonance condition.…
Fractional Spin fluctuations and quantum liquid signature in Gd2ZnIrO6
Birender Singh, Deepu Kumar, Vivek Kumar +5
Hitherto, the discrete identification of quantum spin liquid phase, holy grail of condensed matter physics, remains a challenging task experimentally. However, the precursor of qua…
Coupling of lattice, spin and intra-configurational excitations of Eu3+ in Eu2ZnIrO6
Birender Singh, M. Vogl, S. Wurmehl +3
In Eu2ZnIrO6, effectively two atoms are active i.e. Ir is magnetically active, which results in complex magnetic ordering within the Ir sublattice at low temperature. On the other…
Kramer doublets, phonons, crystal-field excitations and their coupling in Nd2ZnIrO6
Birender Singh, M. Vogl, S. Wurmehl +3
We report comprehensive Raman-scattering measurements on a single crystal of double-perovskite Nd2ZnIrO6 in temperature range of 4-330 K, and spanning a broad spectral range from 2…
Anomalous Phonon Renormalization in Single Crystal of Silicon
Himanshi, Birender Singh, Pradeep Kumar
The temperature dependence of the first-order phonon mode of single crystal of Silicon (Si) is determined by Raman scattering in a broad temperature range of 4-623 K. Our studies r…
Anisotropic Electron-Photon-Phonon Coupling in Layered MoS2
Deepu Kumar, Birender Singh, Rahul Kumar +2
Transition metal dichalcogenide, especially MoS2 has attracted lot of attention recently owing to its tunable visible range band gap and anisotropic electronic and transport proper…
Kitaev Magnetism and Fractionalized Excitations in Double Perovskite Sm2ZnIrO6
Birender Singh, M. Vogl, S. Wurmehl +3
The quest for Kitaev spin liquids in particular three dimensional solids is long sought goal in condensed matter physics, as these states may give rise to exotic new types of quasi…
Thermal Expansion Coefficient and Phonon Dynamics in Coexisting Allotropes of Monolayer WS2 Probed by Raman Scattering
Deepu Kumar, Birender Singh, Pawan Kumar +2
We report a comprehensive temperature dependent Raman measurements on three different phases of monolayer WS2 from 4K to 330K in a wide spectral range. Our studies revels the anoma…
Broken translational and rotational symmetries in LiMn1.5Ni0.5O4 spinel
Birender Singh, Sunil Kumar, Pradeep Kumar
In condensed matter physics broken symmetries and emergence of quasi-particles are intimately linked to each other. Whenever a symmetry is broken, it leaves its fingerprints, and t…
Correlated Paramagnetism and Interplay of Magnetic and Phononic Degrees of Freedom in 3d-5d Coupled La2CuIrO6
Birender Singh, Deepu Kumar, Kaustuv Manna +6
Conventional Paramagnetism - a state with finite magnetic moment per ion sans long range magnetic ordering, but with lowering temperature the moment on each ion picks up a particul…
(Pb1-xBix)(Ti1-xMnx)O3: Competing mechanism of Tetragonal-Cubic phase on A/B site modifications
Arun Kumar Yadav, Anita Verma, Birender Singh +8
Structural, vibrational and dielectric properties of (Pb1-xBix)(Ti1-xMnx)O3 (PBTM) (0 x 0.50) polycrystalline ceramics have been examined as a function of temperature. Synchrotron-…
Orbiton-Phonon coupling in Ir5+(5d4) double perovskite Ba2YIrO6
Birender Singh, G. A. Cansever, T. Dey +4
Ba2YIrO6, a Mott insulator, with four valence electrons in Ir5+ d-shell (5d4) is supposed to be non-magnetic, with Jeff = 0, within the atomic physics picture. However, recent sugg…
Iron Isotope Effect in SmFeAsO0.65 and SmFeAsO0.77H0.12 Superconductors: A Raman Study
Birender Singh, P. M. Shirage, A. Iyo +1
We report the inelastic light scattering studies on SmFeAsO0.65 and SmFeAsO0.77H0.12 with iron isotopes namely 54Fe and 57Fe. In both of these systems under investigation we observ…