HIRES 2026

Session

Hard Condensed Matter

Not scheduled

ILL4

36. Atomic dynamics studied with INS, QENS and large-scale atomistic simulations

Olivier DELAIRE (Duke University)

Invited

Neutron scattering is an ideal probe of the atomic structure and dynamics in solids, from fast ionic diffusion in solid-state electrolytes to lattice dynamics and thermal transport in thermoelectrics, or structural distortions in metal-halide perovskites. Many of these phenomena bridge the time-scales probed by quasielastic and inelastic neutron scattering (QENS/INS). This presentation will...

59. Combining Inelastic Neutron Scattering with Nuclear Magnetic Resonance Spectroscopy for Molecular Hydrogen Endofullerenes

Geoffrey MCNULTY (ILL)

Oral

Endofullerenes consist of supramolecular complexes in which fullerene cages, consisting only of carbon atoms, completely confining single atoms or molecules, or in rare cases, multiple atoms or molecules. Endofullerenes are practical realisations of the classic “particle in a box” problem of quantum mechanics, in which confinement leads to energy quantization. We have studied the quantised...

11. Correlated Electron Dynamics and Magnetic Excitations in Topological and Intermetallic Quantum Materials

Vishnu SHARMA (Indian institute of Technology (BHU) Varanasi)

Poster

Understanding low-energy excitations and spin–charge correlations in quantum materials remains a key challenge in condensed matter physics. In this study, we investigate the magneto transport and structural properties of high-quality intermetallic single crystals (EuAuSb and DyMn6Sn6) alongside topological insulator thin films (Bi–Sb–Te–Se, BSTS) to explore the interplay between topology,...

52. Enhanced dynamics in disordered non-Kramers spin ice Ho2(Ti1−x-Hfx)2O7

Elsa LHOTEL (Institut Néel CNRS)

Invited

The Ho2Ti2O7 compound is a frustrated magnet that does not stabilize an ordered ground state down to the lowest reachable temperature, but instead, enters a correlated but disordered phase called spin ice below about 2K. The excitations out of the spin ice state, described as emergent magnetic monopoles, exhibit extremely slow dynamics at low temperature.
In spin ices such as Ho2Ti2O7, where...

54. High-pressure QENS: identifying plastic phases in planetary ices

Maria RESCIGNO

Oral

Simple molecular systems such as hydrogen, water, ammonia, and methane are the main constituents of the Ice and Gas Giants (Uranus and Neptune), many icy moons, and numerous Neptune-like exoplanets. Space missions have also revealed dissolved salts (e.g., NaCl, KCl) in several icy-moon plumes. Although chemically simple, these systems display rich and sometimes unexpected physical behavior...

34. The Role and Dynamics of Interstitial Water and Sodium in Hydrated Manganese Iron Prussian Blue Analogs: A Synergistic Study Combining NPD, QENS, and MLIP-MD

YuanChi YANG (CEA-Liten, CEA-Irig, UGA)

Oral

Manganese-iron Prussian blue analogs (MnFePBA) are promising cathode materials for sodium-ion batteries due to their high energy density, low cost, and facile synthesis. While most studies advocate dehydration to enhance cycling stability, recent findings suggest that hydration stabilizes a monoclinic phase with superior sodium diffusivity and greater capacity retention than the dehydrated...

47. Theory of Spin Seebeck effect and low-lying crystal field excitations in a Rare-Earth Iron Garnet

Timothy ZIMAN (Institut Laue Langevin)

Oral

The spin Seebeck effect (SSE) is a phenomenon of thermoelectric generation that occurs within a device con- sisting of a bilayer of a metal and a ferromagnet. When Tb3Fe5O12(TbIG) is substituted for the ferromagnet, the effect was observed to go to zero at low temperatures, but increases to positive values with the application of a magnetic field. This is opposite to the expectation that the...