185 citations · 2.3k across the 45 of their papers we have counts for
15 papers · 1 filter
The 2/3 Rule of Glass Physics Implies Universalities in Crystal Melting
Peter Lunkenheimer, Konrad Samwer, Alois Loidl
Since more than 100 years, melting is thought to be governed by the Lindemann criterion. It assumes that a crystal melts when, upon heating, the growing atomic vibration amplitudes…
Broadband Dielectric and THz Spectroscopy on Bio-Related Matter: Water, Amino Acids, Proteins, and Blood
Peter Lunkenheimer, Sebastian Emmert, Martin Wolf +1
In the present work, we examine the relevance and proper interpretation of broadband-dielectric and THz-spectroscopy data for the investigation of various types of biological matte…
Relaxation dynamics of poly(ethylene oxide)
Peter Lunkenheimer, Alois Loidl
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 submol…
Prigogine-Defay ratio of glassy freezing scales with liquid fragility
Alois Loidl, Peter Lunkenheimer, Konrad Samwer
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…
Exploring water's no-man's land
Peter Lunkenheimer, Daniel Reuter, Arthur Schulz +2
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 ra…
Fast dynamics in glass-forming salol investigated by dielectric spectroscopy
P. Lunkenheimer, R. Wehn, M. Köhler +1
We analyze dielectric-loss spectra of glass forming salol extending up to 400 GHz allowing for the detection of the high-frequency minimum, where the fast critical dynamics predict…
Electromagnetic-radiation absorption of water
P. Lunkenheimer, S. Emmert, R. Gulich +4
Why does a microwave oven work? How does biological tissue absorb electromagnetic radiation? Astonishingly, we do not have a definite answer to these simple questions because the m…
MFU-type metal-organic frameworks as host materials of confined supercooled liquids
J. K. H. Fischer, P. Sippel, D. Denysenko +3
In this work we examine the use of metal-organic framework (MOF) systems as host materials for the investigation of glassy dynamics in confined geometry. We investigate the confine…
Cooperativity and the freezing of molecular motion at the glass transition
Th. Bauer, P. Lunkenheimer, A. Loidl
The slowing down of molecular dynamics when approaching the glass transition generally proceeds much stronger than expected for thermally activated motions. This strange phenomenon…
Ions in glass forming glycerol: Close correlation of alpha and fast beta relaxation
M. Köhler, P. Lunkenheimer, Y. Goncharov +1
We provide broadband dielectric loss spectra of glass-forming glycerol with varying additions of LiCl. The measurements covering frequencies up to 10 THz extend well into the regio…
Hydrogen-bond equilibria and life times in a supercooled monohydroxy alcohol
C. Gainaru, S. Kastner, F. Mayr +6
Dielectric loss spectra covering 13 decades in frequency were collected for 2-ethyl-1-hexanol, a monohydroxy alcohol that exhibits a prominent Debye-like relaxation, typical for se…
Electrode Polarization Effects in Broadband Dielectric Spectroscopy
S. Emmert, M. Wolf, R. Gulich +4
In the present work, we provide broadband dielectric spectra showing strong electrode polarization effects for various materials, belonging to very different material classes. This…
Temperature development of glassy alpha-relaxation dynamics determined by broadband dielectric spectroscopy
P. Lunkenheimer, S. Kastner, M. K öhler +1
We present the temperature dependence of alpha-relaxation times of 13 glass formers determined from broadband dielectric spectroscopy, also including data from aging measurements.…
High-frequency dynamics of type-B glass formers investigated by broadband dielectric spectroscopy
S. Kastner, M. Köhler, Y. Goncharov +2
We present the results of broadband dielectric spectroscopy on two glass formers with strong Johari-Goldstein beta-relaxations. In addition to the alpha- and beta-relaxation dynami…
Glassy dynamics in mono-, di-, and tri-propylene glycol: From the alpha- to the fast beta-relaxation
M. Köhler, P. Lunkenheimer, Y. Goncharov +2
We present a thorough characterization of the glassy dynamics of three propylene glycols (mono-, di- and trimer) by broadband dielectric spectroscopy. By covering a frequency range…