A5013353226- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Crystallography and molecular interactions
- High-pressure geophysics and materials
- Crystal structures of chemical compounds
- Rare-earth and actinide compounds
- Physics of Superconductivity and Magnetism
- Advanced Chemical Physics Studies
- Enzyme Structure and Function
- Superconducting Materials and Applications
- Solid-state spectroscopy and crystallography
- Chemical Thermodynamics and Molecular Structure
- Superconductivity in MgB2 and Alloys
- Quantum, superfluid, helium dynamics
- Inorganic Fluorides and Related Compounds
- Hydrogen Storage and Materials
- Nonlinear Optical Materials Research
- Protein Structure and Dynamics
- Chemical Synthesis and Analysis
- Diamond and Carbon-based Materials Research
- Biochemical effects in animals
- Molecular Spectroscopy and Structure
- Iron-based superconductors research
- Crystal Structures and Properties
- Structural and Chemical Analysis of Organic and Inorganic Compounds
Max Planck Institute for Chemistry
2016-2024
Max Planck Institute for Biogeochemistry
2021
Robert Bosch (Germany)
2020
Max Planck Society
2019-2020
Weatherford College
2020
Institute of Solid State Chemistry and Mechanochemistry
2011-2016
Novosibirsk State University
2008-2016
Siberian Branch of the Russian Academy of Sciences
2013-2015
Institute of Solid State Chemistry
2008-2015
Stanford Synchrotron Radiation Lightsource
2011
The discovery of superconducting H
In the last few years, superconducting transition temperature, T
Since the discovery of superconductivity at 200 K in H3S [1] similar or higher transition temperatures, Tcs, have been reported for various hydrogen-rich compounds under ultra-high pressures [2]. Superconductivity was experimentally proved by different methods, including electrical resistance, magnetic susceptibility, optical infrared, and nuclear resonant scattering measurements. The crystal structures superconducting phases were determined X-ray diffraction. Numerous transport measurements...
Abstract Recent discoveries of superconductivity in various hydrides at high pressures have shown that a critical temperature can reach near-room-temperature values. However, experimental studies are limited by high-pressure conditions, and electrical transport measurements been the primary technique for detecting hydrides. Here we implement non-conventional protocol magnetic superconductors SQUID magnetometer probe trapped flux two H 3 S LaH 10 pressures. Contrary to traditional...
The discovery of high-temperature conventional superconductivity in H3S with a critical temperature Tc=203 K was followed by the recent record Tc ~250 face-centered cubic (fcc) lanthanum hydride LaH10 compound. It realized new class hydrogen-dominated compounds having clathrate-like crystal structure which hydrogen atoms form 3D framework and surround host atom rare earth elements. Yttrium hydrides are predicted to have even higher exceeding room temperature. In this paper, we synthesized...
Abstract The series of phase transitions on increasing pressure and reverse decompression was followed in crystals monoclinic orthorhombic polymorphs L ‐cysteine by using Raman spectroscopy, with the samples placed a diamond anvil cell together to ensure identical pressures two samples. effects hydrostatic are shown be radically different. Depending starting polymorph, different phases formed under compression/decompression conditions. effect polymorph studied for first time. Phase (at ∼2.9...
The sulfamethizole antibiotic drug has rich hydrogen bond functionalities (donors: amine NH2 and imine NH; acceptors: sulfonyl O, thiazolidine N S, imidine N), which makes it a functionally diverse molecule to form cocrystals. A cocrystal screen of (SMT) with COOH, NH2, pyridine, CONH2 functional group containing coformers, e.g., p-aminobenzoic acid (PABA), vanillic (VLA), p-aminobenzamide (ABA), 4,4-bipyridine (BIP), suberic (SBA), oxalic (OA), adipic (ADP), resulted in six cocrystals one...
We report the temperature dependence of upper critical fields $\mu_0H_{c2}(T)$ high superconductor H$_3$S under applied pressures 155 and 160 GPa through electrical resistance transition observed DC pulsed magnetic up to 65 T, a record combination pressures. find that $H_{c2}(T)$ generally follows Werthamer, Helfand Hohenberg (WHH) formalism at low fields, albeit with noticeable deviations upon approaching our experimental limit $\mu_0H = 65$ T. In fact, displays remarkably linear on over an...
The possibility of high, room-temperature superconductivity was predicted for metallic hydrogen in the 1960s. However, metallization and are yet to be unambiguously demonstrated may require pressures as high 5 million atmospheres. Rare earth based "superhydrides", such LaH10, can considered a close approximation even though they form at moderately lower pressures. In superhydrides predominance H-H bonds superconducting transition temperatures bear hallmarks hydrogen. Still, experimental...
The recent progress in generating static pressures up to terapascal values opens opportunities for studying novel materials with unusual properties, such as metallization of hydrogen and high-temperature superconductivity. However, an evaluation pressure above ~0.3 is a challenge. We report universal high-pressure scale ~0.5 terapascal, which based on the shift Raman edge stressed diamond anvils correlated equation state Au does not require additional sensor. According new scale, are...
The discovery of superconductivity in H3 S at 203 K marked an advance towards room-temperature and demonstrated the potential H-dominated compounds to possess a high critical temperature (Tc ). There have been numerous reports H-S system over last five years, but important questions remain unanswered. It is crucial verify whether Tc was determined correctly for samples prepared from compressed H2 S, since they are inevitably contaminated with H-depleted byproducts. Here, we prepare...
The discovery of superconductivity above 250 K at high pressure in LaH10 and the prediction overcoming room temperature threshold for YH10 urge a better understanding hydrogen interaction mechanisms with heavy atom sublattice metal hydrides under atomic scale. Here we use locally sensitive X-ray absorption fine structure spectroscopy (XAFS) to get insight into nature phase transitions rearrangements local electronic crystal archetypal hydride YH3 up 180 GPa. combination experimental methods...
We compare the response of crystalline DL-cysteine to cooling and increasing pressure. The structure undergoes a low-temperature phase transition into an isosymmetric polymorph, DL-cysteine-II, with conformation zwitterion changing from gauche− gauche+. first pressure-induced at 0.1 GPa (the lowest pressure reported for in amino acid thus far) gives same polymorph. Further compression DL-cysteine-II proceeds differently on hydrostatic is preserved down 3 K, but transitions about 1.55 GPa,...
In the present work, four solvates of furosemide with tetrahydrofuran S(THF), 1,4-dioxane S(DIOX), N,N-dimethylformamide S(DMF), and dimethylsulfoxide S(DMSO) were crystallized, crystal structures solved for S(DMF). The existence S(THF) was not reported before; previously known S(DIOX) remained unsolved. detailed structural analysis containing showed that molecule has a high conformational lability because rotations sulfamoyl furanylmethylamino fragments. Some conformations shown to be...
We synthesized lanthanum hydride (LaHx) by laser heating of in hydrogen atmosphere at pressure P = 170 GPa. The sample shows a superconducting step 209 K and GPa temperature dependence resistance. By releasing the to 150 GPa, transition Tc increases 215 - record Tc. This finding supports way achieving higher than one H3S (203 K) hydrides with sodalite-like structures, first proposed for CaH6 (Tc=245 later yttrium where higher, room superconductivity is expected.
The recent discovery of high-temperature, high-pressure superconductors, such as hydrides and nickelates, has opened exciting avenues in studying high-temperature superconductivity. primary superconducting properties these materials are well characterized by measuring various electrical magnetic properties, despite the challenges posed environment. Experimental microscopic insight into pairing mechanism superconductors is even more challenging, due to lack direct probes gap structures at...
J. E. Hirsch and F. Marsiglio in their publication [Phys. Rev. B 103, 134505 (2021)], assert that hydrogen-rich compounds under high pressures do not exhibit superconductivity. Their argument hinges on the absence of broadening resistive superconducting transitions applied magnetic fields. We argue this assertion is incorrect, as it relies a flawed analysis selective inaccurate report published data, where data supporting authors' perspective are highlighted while demonstrating clear disregarded.
In a series of recent publications, the crystals L- and DL-cysteine were shown to undergo multiple phase transitions upon variation temperature pressure. All these are related rotation amino acid side chain. Accordingly, cysteine-containing crystal structures should be stabilized with respect by measures that reduce mobility chain in crystalline environment. present work, we show this can achieved increasing significance –SH group as participant intermolecular hydrogen bonds, either...
The effect of hydrostatic pressure on single crystals N-acetyl-l-cysteine was followed at multiple points from 10(-4) to 6.2 GPa with a step 0.2-0.3 by Raman spectroscopy and X-ray diffraction. Since in the thiol group is involved intermolecular hydrogen bonds not as donor only (bonds S-H···O) but also an acceptor N-H···S), increasing does result phase transitions. This makes contrast polymorphs l- dl-cysteine, which transitions are observed already relatively low pressures related changes...
In the present case study of tolazamide we illustrate how many seemingly contradictory results that have been obtained from experimental observations and theoretical calculations can finally start forming a consistent picture: "puzzle put together". For years, was considered to no polymorphs. This made this drug substance unique among large family sulfonylureas, which known be significantly more prone polymorphism than other organic compounds. The work employs broad in-depth analysis...