143 citations · 561 across the 14 of their papers we have counts for
14 papers
Sound absorption in glasses
U. Buchenau, G. D'Angelo, G. Carini +2
The paper presents a description of the sound wave absorption in glasses, from the lowest temperatures up to the glass transition, in terms of three compatible phenomenological mod…
Are universal "anomalous" properties of glasses at low temperatures truly universal?
Miguel A. Ramos
The specific heat Cp and other properties of glasses (ranging from amorphous solids to disordered crystals) at low temperatures, are well known to be markedly different from those…
Tracking the connection between disorder and energy landscape in glasses using geologically hyperaged amber
E. A. A. Pogna, A. I. Chumakov, C. Ferrante +2
Fossil amber offers the unique opportunity of investigating an amorphous material which has been exploring its energy landscape for more than 110 Myears of natural aging. By applyi…
Emergence of glassy features in halomethane crystals
Manuel Moratalla, Jonathan F. Gebbia, Miguel Angel Ramos +6
Both structural glasses and disordered crystals are known to exhibit anomalous thermal, vibrational, and acoustic properties at low temperatures or low energies, what is still a ma…
Glassy anomalies in the low-temperature thermal properties of a minimally disordered crystalline solid
J. F. Gebbia, M. A. Ramos, D. Szewczyk +6
The low-temperature thermal and transport properties of an unusual kind of crystal exhibiting minimal molecular positional and tilting disorder have been measured. The material, na…
Calorimetric Measurements at Low Temperatures in Toluene Glass and Crystal
C. Alvarez-Ney, J. Labarga, M. Moratalla +2
The specific heat of toluene in glass and crystal states, has been measured both at low temperatures down to 1.8 K (using the thermal relaxation method) and in a wide temperature r…
Suppression of tunneling two-level systems in ultrastable glasses of indomethacin
Tomás Pérez-Castañeda, Cristian Rodríguez-Tinoco, Javier Rodríguez-Viejo +1
Glasses and other non-crystalline solids exhibit thermal and acoustic properties at low temperatures anomalously different from those found in crystalline solids, and with a remark…
Two-Level Systems and Boson Peak Remain Stable in 110-Million-Year-Old Amber Glass
Tomás Pérez-Castañeda, Rafael J. Jiménez-Riobóo, Miguel A. Ramos
The two most prominent and ubiquitous features of glasses at low temperatures, namely the presence of tunneling two-level systems and the so-called boson peak in the reduced vibrat…
A new view of the Lindemann criterion
U. Buchenau, R. Zorn, M. A. Ramos
The Lindemann criterion is reformulated in terms of the average shear modulus of the melting crystal, indicating a critical melting shear strain which is necessary to form th…
Superconductivity and magnetism on flux grown single crystals of NiBi3
B. Silva, R. F. Luccas, N. M. Nemes +7
We present resistivity, magnetization and specific heat measurements on flux grown single crystals of NiBi3. We find typical behavior of a type-II superconductor, with, however, a…
Acoustic Properties of Amorphous Solids at Very Low Temperatures: The Quest for Interacting Tunneling States
Pablo Esquinazi, Miguel A. Ramos, Reinhard König
We discuss the strain dependence of the acoustic properties of amorphous metals in both normal and superconducting states, in the temperature range 0.1 mK K. A cross…
Strain dependence of the acoustic properties of amorphous metals below 1K: Evidence for the interaction between tunneling states
R. Koenig, M. A. Ramos, I. Usherov-Marshak +3
We have conducted a thorough study of the acoustic properties between 10^-4 and 1 Kelvin for the amorphous metal Zr_x Cu_1-x (x=0.3 and x=0.4), by measuring the relative change of…
The boson peak in structural and orientational glasses of simple alcohols: Specific heat at low temperatures
Miguel A. Ramos, Cesar Talon, Sebastian Vieira
We review in this work specific-heat experiments, that we have conducted on different hydrogen-bonded glasses during last years. Specifically, we have measured the low-temperature…
Low-temperature specific heat and thermal conductivity of glycerol
C. Talon, Q. W. Zou, M. A. Ramos +2
We have measured the thermal conductivity of glassy glycerol between 1.5 K and 100 K, as well as the specific heat of both glassy and crystalline phases of glycerol between 0.5 K a…