Manh Duc Le

Dispersive-phonon-driven room-temperature Ni1+-Ni2+ polaron hopping in spin-charge coupled rutile niobate

Gourab Roy, Mohit Kumar, Sayan Ghosh, Ekta Kushwaha et autres

Understanding how lattice dynamics mediate polaron hopping is essential for designing multifunctional correlated oxides. Here, we demonstrate room-temperature dispersive phonon excitations and elucidate the Ni1+-Ni2+ polaron-hopping mechanism and the presence of rare spin-charge-phonon coupling even in a magnetically short-range-ordered state in rutile …

Interplay of Spin Waves, Crystal-Field Excitations, and Phonons in Multiferroic Ba3HoRu2O9 revealed by Inelastic Neutron Scattering, Crystal-Field Analysis, and Machine-Learned Phonon Calculations

Ekta Kushwaha, Sayan Ghosh, Gourab Roy, Mohit Kumar et autres

Understanding the microscopic origin of spin-dipole coupling and high-energy excitations in correlated 4d-4f multiferroic oxides is challenging because magnetic, crystal-field, and lattice excitations frequently overlap in energy. The hexagonal 6H perovskite Ba3HoRu2O9 provides an ideal platform to investigate this interplay owing to …

Interplay of Spin Waves, Crystal-Field Excitations, and Phonons in Multiferroic Ba3HoRu2O9 revealed by Inelastic Neutron Scattering, Crystal-Field Analysis, and Machine-Learned Phonon Calculations

Ekta Kushwaha, Sayan Ghosh, Gourab Roy, Mohit Kumar et autres

Understanding the microscopic origin of spin-dipole coupling and high-energy excitations in correlated 4d-4f multiferroic oxides is challenging because magnetic, crystal-field, and lattice excitations frequently overlap in energy. The hexagonal 6H perovskite Ba3HoRu2O9 provides an ideal platform to investigate this interplay owing to …

in, gb (code pays fourni par la source)

Single-ion anisotropy driven chiral magnetic order in a spin-1 antiferromagnetic chain

Sheila Vaidya, S. P. M. Curley, Pascal Manuel, J. R. Stewart et autres

Chirality in magnetic systems gives rise to a wide range of exotic phenomena, yet its influence in S = 1 chains remains largely unexplored. Herein, we present a comprehensive experimental study of a chiral antiferromagnetic S = 1 chain, [ Ni ( …

gb, cn, ch, us (code pays fourni par la source)

Single-ion anisotropy driven chiral magnetic order in a spin-1 antiferromagnetic chain

Sheila Vaidya, S. P. M. Curley, Pascal Manuel, J. R. Stewart et autres

Chirality in magnetic systems gives rise to a wide range of exotic phenomena, yet its influence in <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"> <a:mrow> <a:mi>S</a:mi> <a:mo>=</a:mo> <a:mn>1</a:mn> </a:mrow> </a:math> chains remains largely unexplored. Herein, we present a comprehensive experimental study of a chiral antiferromagnetic <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"> …

gb, cn, ch, us (code pays fourni par la source)

Molecular neutron spectroscopy techniques applied to ceramics $α$-SiC and $β$-Ga$_2$O$_3$

Adam Jackson, Svemir Rudić, Manh Duc Le, S Mukhopadhyay

Neutron spectroscopy is a powerful technique for determining the vibrational states of matter. Instruments with fixed geometry may measure inelastic scattering at a limited set of angles, producing a 1-D spectrum $S(ω)$. Such measurements are usually simulated in a DOS-like semi-analytic incoherent …

Molecular neutron spectroscopy techniques applied to ceramics $α$-SiC and $β$-Ga$_2$O$_3$

Adam Jackson, Svemir Rudić, Manh Duc Le, S Mukhopadhyay

Neutron spectroscopy is a powerful technique for determining the vibrational states of matter. Instruments with fixed geometry may measure inelastic scattering at a limited set of angles, producing a 1-D spectrum $S(ω)$. Such measurements are usually simulated in a DOS-like semi-analytic incoherent …

gb (code pays fourni par la source)

Crystal electric field excitations and spin dynamics in the spin-orbit coupled distorted honeycomb magnet BiErGeO 5

S. Mohanty, S. Guchhait, S. S. Islam, Surya P. Patra et autres

in, dk (code pays fourni par la source)

Observation of Switchable Chiral Magnons in an Altermagnet

Zheyuan Liu, Hodaka Kikuchi, Zijun Wei, Shinichiro Asai et autres

Chiral magnons, the quanta of handed spin waves, transport spin angular momentum without energy loss due to Joule heating. The recently discovered altermagnets were proposed to host chiral magnons arising from a nonrelativistic exchange mechanism, similar to that in ferromagnets but without …

hu, jp, us, fr (code pays fourni par la source)

Quasiparticle dynamics in the 4 d − 4 f Ising-like double perovskite Ba 2 DyRuO 6 studied using neutron scattering and machine-learning framework

G. Roy, E. Kushwaha, Mohit Kumar, Shubhadeep Ghosh et autres

Double perovskites containing 4d--4f interactions provide a platform to study complex magnetic phenomena in correlated systems. Here, we investigate the magnetic ground state and quasiparticle excitations of the fascinating double perovskite system, Ba$_2$DyRuO$_6$, through Time of flight (TOF) neutron diffraction (TOF), inelastic …

in, us, Afrique du Sud (code pays fourni par la source)

Magnetic and phononic dynamics in the two-ladder quantum magnet ( C 5 H 9 NH 3 ) 2 CuBr 4

J. Philippe, F. Elson, Tina Arh, Sergio Sanz et autres

In quantum magnetic materials it is common to observe both static and dynamic lattice effects on the magnetic excitation spectrum. Less common is to find that the magnetic correlations have a significant impact on the phonon spectrum. Here we study the metal-organic …

ch, se, de, fr (code pays fourni par la source)

Spin excitation continuum from degenerate states in the mixed ferro-antiferromagnetic exchange system CeMgAl ₁₁ O ₁₉

Bin Gao, T. Chen, Chunxiao Liu, Mason Klemm et autres

In the search for unconventional magnetism, exotic quantum states are characterized by a lack of order and a broad spin excitation continuum approaching zero temperature. We study the two-dimensional triangular-lattice effective spin-[Formula: see text] system CeMgAl₁₁O₁₉, which shows slight disorder but no …

us, jp, cn, kr, gb, ca, pl (code pays fourni par la source)