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K.Biljaković ECRYS-20111/18 K. Biljaković Institute of physics, Zagreb, Croatia CHARGE DENSITY GLASS DYNAMICS SOFT POTENTIALS AND SOFT MODES.

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Presentation on theme: "K.Biljaković ECRYS-20111/18 K. Biljaković Institute of physics, Zagreb, Croatia CHARGE DENSITY GLASS DYNAMICS SOFT POTENTIALS AND SOFT MODES."— Presentation transcript:

1 K.Biljaković ECRYS-20111/18 K. Biljaković Institute of physics, Zagreb, Croatia CHARGE DENSITY GLASS DYNAMICS SOFT POTENTIALS AND SOFT MODES

2 K.Biljaković ECRYS-20112/18 THERMOdynamic properties: 50 mK < T < 10 K of CDW (SDW) systems of CDW (SDW) systems generic behaviour generic behaviour DW glasses ÷ conventional glasses DW glasses ÷ conventional glasses

3 K.Biljaković ECRYS-20113/18 ´86….spoon like softening

4 K.Biljaković ECRYS-20114/18 two additional contributions to low-T C p T < 1K T < 1K Two Level States/Systems (TLS) contribution Two Level States/Systems (TLS) contribution C TLS ~ T ν ν < 1 T < 1K T < 1K “Boson peak – like” contribution “Boson peak – like” contribution bump in C p /T 3

5 K.Biljaković ECRYS-20115/18 Glass dynamics

6 K.Biljaković ECRYS-20116/18 Soft potentials…

7 K.Biljaković ECRYS-20117/18 Two Level States/Systems (TLS) glasses glasses microscopic nature of TLS still a mystery “an atom/group of atoms sitting equally well in one of two positions” TLS responsible for the low –T properties specific heat C V ~ T thermal conductivity ~ T 2 DW glasses DW glasses TLS are local DW deformationssolitons é Larkin, Brazovsky, Ovchinnikov, Mélin TLS responsible for the low –T properties very slow dynamics magnetic field effects specific heat C V ~ T ν + T -2

8 K.Biljaković ECRYS-20118/18 Phonons C 0 are weaky coupled to C LEE time-dependent C p long-time relaxations

9 K.Biljaković ECRYS-20119/18 Energy barriers

10 K.Biljaković ECRYS-201110/18

11 K.Biljaković ECRYS-201111/18 Soft modes…

12 K.Biljaković ECRYS-201112/18 Monaco & Mossa, PNAS 2009 Boson peak in glasses freezing of incomplete softening!? Kohn anomaly KCP Blue bronze

13 K.Biljaković ECRYS-201113/18 Pinning resonance – DWG boson peak

14 K.Biljaković ECRYS-201114/18

15 K.Biljaković ECRYS-201115/18 Other incommensurate systems… Cano & Levanyuk, PRL 2004

16 K.Biljaković ECRYS-201116/18

17 K.Biljaković ECRYS-201117/18 Thanks to collaboration J.C. Lasjaunias, P. Monceau, G. Remenyi, R. Mélin, J. Souletie* Institut L. Néel, Grenoble Institut L. Néel, Grenoble S. Sahling TU Dresden, Institut für Festkörperphysik TU Dresden, Institut für Festkörperphysik D. Starešinić Institute of Physics, Zagreb Institute of Physics, Zagreb

18 I am a mountain I am the sea, You can't take that away from me

19 K.Biljaković ECRYS-20115/13 amplitudon phason

20 K.Biljaković ECRYS-20113/13

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