A5062004162- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Physics of Superconductivity and Magnetism
- Multiferroics and related materials
- Rare-earth and actinide compounds
- Crystal Structures and Properties
- X-ray Diffraction in Crystallography
- Magnetism in coordination complexes
- Geological and Geophysical Studies
- Crystallization and Solubility Studies
- Metal-Organic Frameworks: Synthesis and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Iron-based superconductors research
- Theoretical and Computational Physics
- Inorganic Chemistry and Materials
- Nuclear materials and radiation effects
- Vibration and Dynamic Analysis
- Topological Materials and Phenomena
- Magneto-Optical Properties and Applications
- Lattice Boltzmann Simulation Studies
- High-pressure geophysics and materials
- Fluid Dynamics and Vibration Analysis
- Atomic and Subatomic Physics Research
- Lanthanide and Transition Metal Complexes
- Organic and Molecular Conductors Research
Sungkyunkwan University
2025
Paul Scherrer Institute
2025
Indian Institute of Science Education and Research Thiruvananthapuram
2018-2024
COMSATS University Islamabad
2024
We present the ground state properties of a new quantum antiferromagnet, ${\mathrm{YbBO}}_{3}$, in which isotropic ${\mathrm{Yb}}^{3+}$ triangular layers are separated by nonmagnetic layer partially occupied B and O(2) sites. The magnetization heat capacity data establish spin-orbit entangled effective spin ${J}_{\mathrm{eff}}=\frac{1}{2}$ ions at low temperatures, interacting antiferromagnetically with an intralayer coupling $J/{k}_{\mathrm{B}}\ensuremath{\simeq}0.53$ K. absence...
We delineate quantum magnetism in the strongly spin-orbit coupled distorted honeycomb lattice antiferromagnet ${\mathrm{BiYbGeO}}_{5}$. Our magnetization and heat capacity measurements reveal that its low-temperature behavior is well described by an effective ${J}_{\mathrm{eff}}=\frac{1}{2}$ Kramers doublet of ${\mathrm{Yb}}^{3+}$. The ground state nonmagnetic with a tiny spin gap. Temperature-dependent magnetic susceptibility, isotherm, can be modeled assuming isolated dimers anisotropic...
We investigate the ground-state properties and effects of temperature magnetic field on elementary excitations in $s=1/2$ rouaite ${\mathrm{Cu}}_{2}{(\mathrm{OH})}_{3}{\mathrm{NO}}_{3}$ using bulk magnetization high-field Raman spectroscopic experiments. The unique exchange topology rouaite, consisting weakly coupled alternating ferromagnetic antiferromagnetic chains, gives rise to a rich array field-induced phases, including 2/3-plateau phase at...
The pursuit of a unifying theory for non-BCS superconductivity has faced significant challenges. One approach to overcome such challenges is perform systematic investigations into superconductors containing \textit{d}-electron metals in order elucidate their underlying mechanisms. Recently, the Sc$_6M$Te$_2$ ($M$ = d-electron metal) family emerged as unique series isostructural compounds exhibiting across range $3d$, $4d$, and $5d$ electron systems. In this study, we employ muon spin...
Magnetic frustration is a key ingredient to prevent conventional ordering and, in combination with enhanced fluctuations low dimensional quantum magnets, stabilize the long sought spin liquid ground states. Most experimental candidates inevitably deviate from perfectly frustrated models due chemical and structural disorder, blurring nature origin of their Y-Kapellasite Y$_3$Cu$_9$(OH)$_{19}$Cl$_{8}$ realizes chemically clean system an underlying kagome sub-lattice. The crystals undergo...
Gaining a deeper understanding of the interplay between charge density wave (CDW) order and superconductivity in transition metal dichalcogenides (TMDs), particularly within (4H/2H)-<a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:msub><a:mrow><a:mi>Nb</a:mi><a:mi>X</a:mi></a:mrow><a:mn>2</a:mn></a:msub><a:mo> </a:mo><a:mrow><a:mo>(</a:mo><a:mi>X</a:mi><a:mo>=</a:mo><a:mi>Se</a:mi></a:mrow></a:math> S) family, remains an open intriguing challenge. A systematic microscopic study across...
A detailed study of the magnetic and magnetocaloric properties garnet compound ${\mathrm{Mn}}_{3}{\mathrm{Cr}}_{2}{\mathrm{Ge}}_{3}{\mathrm{O}}_{12}$ is carried out using x-ray diffraction, magnetization, heat capacity, neutron diffraction measurements as well ab initio band-structure calculations. This manifests two successive transitions at ${T}_{\mathrm{N}1}\ensuremath{\simeq}4.5\phantom{\rule{0.16em}{0ex}}\mathrm{K}$...
Two triangular lattice antiferromagnets Sr$_3$Co(Nb,Ta)$_2$O$_9$ with an effective $j_{\rm eff}=1/2$ of Co$^{2+}$ are synthesized and their magnetic properties investigated via magnetization heat capacity measurements. The leading in-plane antiferromagnetic exchange coupling is estimated to be $J/k_{\rm B} \simeq 4.7$ K 5.8 K, respectively. Both the compounds feature two-step transitions at low temperatures [($T_{\rm N1} 1.47$ $T_{\rm N2} 1.22$ K) ($T_{\rm 0.88$ 0.67$ K), respectively],...
The structural and magnetic properties of the square-cupola antiferromagnet Sr(TiO)Cu$_{4}$(PO$_{4}$)$_{4}$ are investigated via x-ray diffraction, magnetization, heat capacity, $^{31}$P nuclear resonance experiments on polycrystalline samples, as well density-functional band-structure calculations. temperature-dependent unit cell volume could be described using Debye approximation with temperature $\theta_{\rm D} \simeq $ 550~K. Magnetic response reveals a pronounced two-dimensionality...
We probe the magnetic field-induced Tomonaga-Luttinger liquid (TLL) state in bond-alternating spin-$1/2$ antiferromagnetic (AFM) chain compound ${\mathrm{NaVOPO}}_{4}$ using thermodynamic as well local $\ensuremath{\mu}\mathrm{SR}$ and $^{31}\mathrm{P}$ NMR probes down to mK temperatures fields up 14 T. The relaxation rates gapless TLL regime decay slowly following characteristic power-law behavior, enabling us directly determine interaction parameter $K$ a function of field. These estimates...
We set forth the structural and magnetic properties of frustrated spin-$5/2$ triangle lattice antiferromagnet ${\mathrm{Na}}_{3}\mathrm{Fe}{({\mathrm{PO}}_{4})}_{2}$ examined via x-ray diffraction, magnetization, heat capacity, neutron diffraction measurements on polycrystalline sample. No distortion was detected from temperature-dependent down to 12.5 K, except a systematic contraction. The susceptibility at high temperatures agrees well with high-temperature series expansion for isotropic...
Structural, electronic, and magnetic properties of modified cubic spinel compound ${\mathrm{LiNi}}_{0.5}{\mathrm{Mn}}_{1.5}{\mathrm{O}}_{4}$ are studied via x-ray diffraction, resistivity, dc ac magnetization, heat capacity, neutron $^{7}\mathrm{Li}$ nuclear resonance, magnetocaloric effect, relaxation, memory effect experiments. We stabilized this in a structure with space group $P{4}_{3}32$. It exhibits semiconducting character an electronic band gap...
The kagome lattice has emerged as a promising platform for hosting unconventional chiral charge order at high temperatures. Notably, in LaRu$_{3}$Si$_{2}$, room-temperature charge-ordered state with propagation vector of ($\frac{1}{4}$,~0,~0) been recently identified. However, understanding the interplay between this and superconductivity, particularly respect to time-reversal-symmetry breaking, remains elusive. In study, we employ single crystal X-ray diffraction, magnetotransport,...
Vacancies in solid-state physics are underexplored materials with strong electron-electron correlations. Recent research on the Ir-Sb binary system revealed an extended buckled-honeycomb vacancy (BHV) order. Superconductivity arises by suppressing BHV ordering through high-pressure growth excess Ir atoms or Rh substitution, yet superconducting pairing nature remains unknown. To explore this, we conducted muon spin rotation experiments
La-based B-site disordered double perovskites, Ca 2− x La FeRuO 6 , have been investigated thoroughly. The effects of A-site substitution on the charge states and electronic magnetic properties determined in a series 3d/4d perovskites.
Correlation of molecular structure and its magnetic property gives a better understanding toward the design materials with long-range order. Here we report two new cobalt-based coordination polymers that exhibited coexistence ferromagnetic (FM) order spin-glass (SG) transition at below Tc. Different orientation moments, arrangements, variation in connectivity ligands might be responsible for SG transition. The was characterized by bifurcation zero-field-cooled field-cooled splitting Tf ≈ 9.9...
Vacancies play a crucial role in solid-state physics, but their impact on materials with strong electron-electron correlations has been underexplored. A recent study the Ir-Sb binary system, Ir$_{16}$Sb$_{18}$ revealed novel extended buckled-honeycomb vacancy (BHV) order. Superconductivity is induced by suppressing BHV ordering through high-pressure growth excess Ir atoms or isovalent Rh substitution, although nature of superconducting pairing remained unexplored. Here, we conduct muon spin...
A detailed study of the structural and magnetic properties a garnet compound Mn$_{3}$Cr$_{2}$Ge$_{3}$O$_{12}$ is carried out using x-ray diffraction, magnetization, heat capacity, neutron diffraction measurements. This manifests two successive transitions at $T_{\rm N1} \simeq 4.5$ K N2} 2.7$ K. Neutron powder experiments reveal that these correspond to orderings Cr$^{3+}$ Mn$^{2+}$ sub-lattices, respectively. The ordering N1}$ found be collinear antiferromagnetic type while one N2}$...
The complex dynamics of mixed convection circumstances, concentrating on two examples. In the first case, was investigated in a single-sided lid-driven cavity with top and bottom walls arrangement second scenario explores parallel anti-parallel topologies, focusing double-sided cavity. main parameters this study are Reynolds, Rayleigh, Prandtl, Grashof, Richardson numbers. Calculation numerical solutions to Navier-Stokes equations over wide ranges parameters, 0 ? Gr 106, Re 3000, Pr~O(1), an...
Abstract Two new metal cluster (Ni 4 and Co 2 Ni ) based rod shaped micron sized metal‐organic frameworks (MOFs) of formulas [Ni ( μ 3 ‐OH)( ‐H O)(pyrazine)(OBA)(OBAH)] compound‐1 [CoNi( compound‐2 ), {OBA=4,4′‐Oxybis(benzoate)} are synthesized via solvothermal technique. Structural, morphological magnetic properties both the compounds characterized using x‐ray diffraction, infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy, DC magnetization measurements. The...
Two triangular lattice antiferromagnets Sr$_3$Co(Nb,Ta)$_2$O$_9$ with an effective $j_{\rm eff}=1/2$ of Co$^{2+}$ are synthesized and their magnetic properties investigated via magnetization heat capacity measurements. The leading in-plane antiferromagnetic exchange coupling is estimated to be $J/k_{\rm B} \simeq 4.7$ K 5.8 K, respectively. Both the compounds feature two-step transitions at low temperatures [($T_{\rm N1} 1.47$ $T_{\rm N2} 1.22$ K) ($T_{\rm 0.88$ 0.67$ K), respectively],...
We probe the magnetic field-induced Tomonaga-Luttinger liquid (TLL) state in bond-alternating spin-$1/2$ antiferromagnetic (AFM) chain compound NaVOPO$_4$ using thermodynamic as well local $\mu$SR and $^{31}$P NMR probes down to milli-K temperatures fields up 14~T. The relaxation rates gapless TLL regime decay slowly following characteristic power-law behaviour, enabling us directly determine interaction parameter $K$ a function of field. These estimates are cross-checked magnetization...