Miguel Angel Ramos Ruiz


miguel.ramos@uam.es
Tel: +34 497 3636

Born in Madrid (Spain), he graduated in Physics in 1985 and got his PhD degree in 1990, both at Universidad Autonoma de Madrid. Along his doctoral thesis, he developed the first Low-temperature Scanning Tunneling Microscope in Spain (and the third in the world), performing tunneling spectroscopy experiments in so-called High Critical Temperature Superconductors.

During a post-doctoral stay in the KFA at Jülich (Germany), he worked on a theoretical model (the Soft-Potential Model) which rather successfully accounts for the low-energy excitations in glasses or non-crystalline solids. His current research lines focus on the study of thermal (and also acoustic, structural and vibrational) properties of glasses and other disordered solids, at low temperatures and/or low energies. Emphasis is put on correlating these with their thermodynamic properties at higher temperatures, that is, around the glass transition region, an open and much debated unsolved topic in physics since longer than 100 years.

In the last years, his group has mainly studied polymorphic molecular solids made of simple monoalcohols (such as ethanol, propanol, butanol and their isomers) which exhibit glassy phases together with crystalline ones including sometimes orientational disorder, as well as extremely stable glasses, such as hyperaged geological amber or physical vapor deposited indomethacin.

Finally, he has also started a new research line on the possible existence of magnetism and/or superconductivity in carbon materials (graphite, diamond) by ion-beam irradiation, employing the 5 MV ion-beam accelerator at CMAM-UAM.

Some Recently Published Articles:

1.- "Lattice damage in 9-MeV-carbon irradiated diamond and its recovery after annealing", F. Agulló-Rueda, N. Gordillo, M. D. Ynsa, A. Maira, J. Cañas, and M. A. Ramos, Carbon 123, 334-343 (2017).

2.- "Glassy Anomalies in the Low-Temperature Thermal Properties of a Minimally Disordered Crystalline Solid", J. F. Gebbia, M. A. Ramos, D. Szewczyk, A. Jezowski, A. I. Krivchikov, Y. V. Horbatenko, T. Guidi, F. J. Bermejo, and J. Ll. Tamarit, Phys. Rev. Lett. 119, 215506 (2017).

3.- "Thermodynamic and Kinetic Fragility of Freon 113: The Most Fragile Plastic Crystal", A. Vispa, M. Romanini, M. A. Ramos, L. C. Pardo, F. J. Bermejo, M. Hassaine, A. I. Krivchikov, J. W. Taylor, and J. Ll. Tamarit, Phys. Rev. Lett. 118, 105701 (2017).

4.- "Micro-Raman spectroscopy of near-surface damage in diamond irradiated with 9-MeV boron ions", F. Agulló-Rueda, M. D. Ynsa, N. Gordillo, A. Maira, D. Moreno-Cerrada, and M. A. Ramos, Diamond & Related Materials 72, 94-98 (2017).

5.- “Investigation of the magnetic properties of proton irradiated type Ib HPHT diamond”, N. Daya, E. Sideras-Haddad, T.N.Makgato, M. García-Hernández, A. Climent-Font, A.Zucchiatti, and M.A. Ramos, Diamond & Related Materials 64, 197–201 (2016).

6.- “Suppression of tunneling two-level systems in ultrastable glasses of indomethacin”, T. Pérez-Castañeda, C. Rodríguez-Tinoco, J. Rodriguez-Viejo and M. A. Ramos, PNAS 111, 11275−11280 (2014).

7.- “Two-Level Systems and Boson Peak Remain Stable in 110-Million-Year-Old Amber Glass”, T. Pérez-Castañeda, R.J. Jiménez-Riobóo and M. A. Ramos, Phys. Rev. Lett. 112, 165901 (2014).

8.- “Low-temperature specific heat of graphite and CeSb2: Validation of a quasi-adiabatic continuous method", T. Pérez-Castañeda, J. Azpeitia, J. Hanko, A. Fente, H. Suderow, and M. A. Ramos, Journal of Low Temperature Physics 173, pp. 420 (2013).

9.- “Superconductivity and magnetism on flux grown single crystals of NiBi3”, B. Silva, R. F. Luccas, N. M. Nemes, J. Hanko, M. R. Osorio, P. Kulkarni, F. Mompean, M. García-Hernández, M. A. Ramos, S. Vieira and H. Suderow, Phys. Phys. Rev. B 88, 184508 (2013).

10.- “Magnetic properties of graphite irradiated with MeV ions”, M. A. Ramos, J. Barzola-Quiquia, P. Esquinazi, A. Muñoz-Martín, A. Climent-Font and M. García-Hernández, Phys. Rev. B 81, 214404 (2010).

 

Website: http://www.fmc.uam.es/members/academic-staff/professors/ramos-ruiz-miguel-angel/


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