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View article: In memory of Professor Boris I. Kochelaev (04/19/1934 – 09/29/2025)
In memory of Professor Boris I. Kochelaev (04/19/1934 – 09/29/2025) Open
On September 29, 2025, Boris Ivanovich Kochelaev, an outstanding theoretical physicist, professor-consultant of the Department of Theoretical Physics at Kazan University, and Doctor of Physical and Mathematical Sciences, passed away at the…
View article: Prigogine-Defay ratio of glassy freezing scales with liquid fragility
Prigogine-Defay ratio of glassy freezing scales with liquid fragility Open
A detailed study of published experimental data for a variety of materials on the incremental variation of heat capacity, thermal expansion, and compressibility at glassy freezing reveals a striking dependence of the Prigogine-Defay ratio …
View article: Relaxation dynamics of poly(ethylene oxide)
Relaxation dynamics of poly(ethylene oxide) Open
Poly(ethylene oxide) is an important polymer with many applications, e.g., as solid-state electrolyte in batteries. Its relaxation dynamics, characterizing its molecular and submolecular motions, which is relevant for many of these applica…
View article: Crystal melting influenced by particle cooperativity of the liquid
Crystal melting influenced by particle cooperativity of the liquid Open
Recently, a universal relation between the thermal expansion coefficient of\nglasses $\\alpha_g$, their glass-transition temperature Tg, and the so-called\nfragility index m of the corresponding supercooled liquid state was found to be\nva…
View article: Ab initio Modeling of Phonons in the Family of Quasi-One-Dimensional Antiferromagnets AFeX2
Ab initio Modeling of Phonons in the Family of Quasi-One-Dimensional Antiferromagnets AFeX2 Open
A review of the recent development in ab initio calculations of the vibrational properties of quasi-one-dimensional (1D) antiferromagnets with AFeX2 structure is presented. Density functional theory (DFT + U) was applied to calculate the p…
View article: Prigogine-Defay ratio of glassy freezing scales with liquid fragility
Prigogine-Defay ratio of glassy freezing scales with liquid fragility Open
A detailed study of published experimental data for a variety of materials on the incremental variation of heat capacity, thermal expansion, and compressibility at glassy freezing reveals a striking dependence of the Prigogine-Defay ratio …
View article: THz spectroscopy on the amino acids L-serine and L-cysteine
THz spectroscopy on the amino acids L-serine and L-cysteine Open
We present a detailed study on the temperature-dependent THz spectra of the polycrystalline amino acids, L-serine and L-cysteine, for wavenumbers from 20 to 120 cm−1 and temperatures from 4 to 300 K. Even though the structure of these two …
View article: Chiral excitations and the intermediate-field regime in the Kitaev magnet <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>α</mml:mi><mml:mo>−</mml:mo><mml:msub><mml:mi>RuCl</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>
Chiral excitations and the intermediate-field regime in the Kitaev magnet Open
In the Kitaev magnet α-RuCl3, the existence of a magnetic-field-induced quantum spin-liquid phase and of anyonic excitations is controversially discussed. We address this elusive, exotic phase via helicity-dependent Raman scattering and an…
View article: Pressure-Induced Changes in the Crystal Structure and Electrical Conductivity of GeV<sub>4</sub>S<sub>8</sub>
Pressure-Induced Changes in the Crystal Structure and Electrical Conductivity of GeV<sub>4</sub>S<sub>8</sub> Open
Lacunar spinels, represented by AM4X8 compounds (A = Ga or Ge; M = V, Mo, Nb, or Ta; X = S or Se), form a unique group of ternary chalcogenide compounds. Among them, GeV4S8 has garnered significant attention due to its distinctive electric…
View article: Rotational dynamics, ionic conductivity, and glass formation in a ZnCl2-based deep eutectic solvent
Rotational dynamics, ionic conductivity, and glass formation in a ZnCl2-based deep eutectic solvent Open
Glass formation and reorientational motions are widespread but often-neglected features of deep eutectic solvents although both can be relevant for the technically important ionic conductivity at room temperature. Here, we investigate thes…
View article: Magnetism of CuCr$_2$X$_4$ (X= S and Se) spinels studied with muon spin rotation and relaxation ($μ$SR)
Magnetism of CuCr$_2$X$_4$ (X= S and Se) spinels studied with muon spin rotation and relaxation ($μ$SR) Open
We present muon spin rotation and relaxation ($μ$SR) results for chalcogenide spinels CuCr$_2$X$_4$ with X= S and Se. Both compounds are known as ferromagnetic metals with high Curie temperatures. Our $μ$SR and magnetization data show clea…
View article: Ionic conductivity of a lithium-doped deep eutectic solvent: Glass formation and rotation-translation coupling
Ionic conductivity of a lithium-doped deep eutectic solvent: Glass formation and rotation-translation coupling Open
Deep eutectic solvents with admixed lithium salts are considered as electrolytes in electrochemical devices like batteries or supercapacitors. Compared to eutectic mixtures of hydrogen-bond donors and lithium salts, their raw-material cost…
View article: THz spectroscopy on amino acids
THz spectroscopy on amino acids Open
We present a detailed study on the temperature-dependent THz spectra of the polycrystalline amino acids L-serine and L-cysteine for wave numbers from 20 to 120 cm-1 and temperatures from 4 to 300 K. Even though the structure of these two a…
View article: Exploring water's no-man's land
Exploring water's no-man's land Open
The investigation of water's glass transition and a possible liquid-liquid transition within its supercooled state is hampered by its inevitable crystallization in a temperature range, termed "no-man's land". Here we report dielectric-spec…
View article: Rotational dynamics, ionic conductivity, and glass formation in a ZnCl2-based deep eutectic solvent
Rotational dynamics, ionic conductivity, and glass formation in a ZnCl2-based deep eutectic solvent Open
Glass formation and reorientational motions are widespread, but often-neglected features of deep eutectic solvents, although both can be relevant for the technically important ionic conductivity at room temperature. Here we investigate the…
View article: 2H NMR studies on the dynamics of supercooled water in a metal–organic framework
2H NMR studies on the dynamics of supercooled water in a metal–organic framework Open
We use 2H nuclear magnetic resonance (NMR) to study water (D2O) reorientation and diffusion in the metal–organic framework MFU-4l, which features a regular three-dimensional network of nearly spherical pores with diameters of 1.2 and 1.9 n…
View article: Dipolar relaxation, conductivity, and polar order in AgCN
Dipolar relaxation, conductivity, and polar order in AgCN Open
By using dielectric spectroscopy in a broad range of temperatures and frequencies, we have investigated dipolar relaxations, the dc conductivity, and the possible occurrence of polar order in AgCN. The conductivity contributions dominate t…
View article: Chiral excitations and the intermediate-field spin-liquid regime in the Kitaev magnet $α$-RuCl$_3$
Chiral excitations and the intermediate-field spin-liquid regime in the Kitaev magnet $α$-RuCl$_3$ Open
In the Kitaev magnet $α$-RuCl$_3$, the existence of a magnetic-field-induced quantum spin liquid phase and of anyonic excitations are discussed controversially. We address this elusive, exotic phase via helicity-dependent Raman scattering …
View article: Arriving at the most plausible interpretation of the dielectric spectra of glycerol with help from quasielastic <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>γ</mml:mi></mml:math>-ray scattering time-domain interferometry
Arriving at the most plausible interpretation of the dielectric spectra of glycerol with help from quasielastic -ray scattering time-domain interferometry Open
Glycerol is one of the glass-forming liquids selected by Robert H. Cole in 1950 to start his study of molecular dynamics by dielectric spectroscopy. Seventy-one years have gone by and remarkably no consensus has been reached on the nature …
View article: Nonequilibrium dynamics of $α$-RuCl$_{3}$ -- a time-resolved magneto-optical spectroscopy study
Nonequilibrium dynamics of $α$-RuCl$_{3}$ -- a time-resolved magneto-optical spectroscopy study Open
We present time-resolved magneto-optical spectroscopy on the magnetic Mott-Hubbard-insulating Kitaev spin liquid candidate $α$-RuCl$_3$ to investigate the nonequilibrium dynamics of its antiferromagnetically ordered zigzag groundstate afte…
View article: Magneto-optical study of metamagnetic transitions in the antiferromagnetic phase of $α$-RuCl$_3$
Magneto-optical study of metamagnetic transitions in the antiferromagnetic phase of $α$-RuCl$_3$ Open
$\alpha$-RuCl$_3$ is a promising candidate material to realize the so far elusive quantum spin liquid ground state. However, at low temperatures, the coexistence of different exchange interactions couple the effective pseudospins into an a…
View article: Nonequilibrium dynamics of α-RuCl<sub>3</sub> – a time-resolved magneto-optical spectroscopy study
Nonequilibrium dynamics of α-RuCl<sub>3</sub> – a time-resolved magneto-optical spectroscopy study Open
We present time-resolved magneto-optical spectroscopy on the magnetic Mott–Hubbard-insulating Kitaev spin liquid candidate α-RuCl 3 to investigate the nonequilibrium dynamics of its antiferromagnetically ordered zigzag groundstate after ph…
View article: Probing Magnetic Exchange Interactions with Helium
Probing Magnetic Exchange Interactions with Helium Open
Controlling and sensing spin polarization of electrons forms the basis of spintronics. Here, we report a study of the effect of helium on the spin polarization of the tunneling current and magnetic contrast in spin-polarized scanning tunne…
View article: On the proximate Kitaev quantum-spin liquid α-RuCl<sub>3</sub>: thermodynamics, excitations and continua
On the proximate Kitaev quantum-spin liquid α-RuCl<sub>3</sub>: thermodynamics, excitations and continua Open
This topical review provides an overview over recent thermodynamic, infrared, and THz results on the proximate Kitaev spin-liquid. Quantum-spin liquids are exotic phases characterized by the absence of magnetic ordering even at the lowest …
View article: On the complexity of spinels: Magnetic, electronic, and polar ground\n states
On the complexity of spinels: Magnetic, electronic, and polar ground\n states Open
This review summarizes more than 100 years of research on spinel compounds,\nmainly focusing on the progress in understanding their magnetic, electronic,\nand polar properties during the last two decades. Many spinel compounds are\nmagneti…