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Soft Potentials and Dynamics in Charge Density Wave Glasses

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This study by K. Biljaković from the Institute of Physics, Zagreb, presents an in-depth analysis of charge density wave (CDW) systems and their thermodynamic properties between 50 mK and 10 K. The findings discuss the generic behavior of DW glasses compared to conventional glasses, including phenomena like spoon-like softening and the role of two-level systems (TLS) in low-temperature dynamics. Insights into soft potentials and microscopic nature of TLS underline the complexities in understanding the low-T properties and thermal effects in these materials, contributing to the ongoing research in glass dynamics.

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Soft Potentials and Dynamics in Charge Density Wave Glasses

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  1. CHARGE DENSITY GLASS DYNAMICS SOFT POTENTIALS AND SOFT MODES K. Biljaković Institute of physics, Zagreb, Croatia K.Biljaković ECRYS-2011 1/18

  2. THERMOdynamicproperties: 50 mK< T <10 K of CDW (SDW) systems genericbehaviour DW glasses÷conventionalglasses K.Biljaković ECRYS-2011 2/18

  3. ´86….spoon like softening K.Biljaković ECRYS-2011 3/18

  4. twoadditionalcontributions to low-T C p • T <1K TwoLevelStates/Systems (TLS) contribution • C TLS ~ Tνν < 1 • T < 1K • “Bosonpeak – like” contribution • bump in Cp/T3 K.Biljaković ECRYS-2011 4/18

  5. Glassdynamics K.Biljaković ECRYS-2011 5/18

  6. Soft potentials… K.Biljaković ECRYS-2011 6/18

  7. Two Level States/Systems(TLS) • glasses • microscopic nature of TLS • still a mystery • “an atom/group of atoms sitting • equallywell in one of two positions” • DW glasses • TLS are local DW deformations • solitons • Larkin,Brazovsky, Ovchinnikov, Mélin • TLS responsible for the low –T properties • specific heat CV ~ T • thermal conductivity ~ T2 • TLS responsible for the low –T properties • veryslowdynamics • magneticfieldeffects • specific heat CV ~ Tν+ T-2 K.Biljaković ECRYS-2011 7/18

  8. time-dependentCp long-time relaxations Phonons C0 are weakycoupled to CLEE K.Biljaković ECRYS-2011 8/18

  9. Energybarriers K.Biljaković ECRYS-2011 9/18

  10. TLS vs.  (secondary) process K.Biljaković ECRYS-2011 10/18

  11. Soft modes… K.Biljaković ECRYS-2011 11/18

  12. Kohnanomaly Boson peak in glasses freezing of incomplete softening!? KCP Bluebronze K.Biljaković Monaco & Mossa, PNAS 2009 ECRYS-2011 12/18

  13. Pinning resonance – DWG bosonpeak K.Biljaković ECRYS-2011 13/18

  14. K.Biljaković ECRYS-2011 14/18

  15. Otherincommensuratesystems… Cano & Levanyuk, PRL 2004 K.Biljaković ECRYS-2011 15/18

  16. K.Biljaković ECRYS-2011 16/18

  17. Thanks tocollaboration J.C. Lasjaunias, P. Monceau, G. Remenyi, R. Mélin, J. Souletie* Institut L. Néel, Grenoble S. Sahling TU Dresden, Institut fürFestkörperphysik D. Starešinić Institute of Physics, Zagreb K.Biljaković ECRYS-2011 17/18

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

  19. amplitudon phason K.Biljaković ECRYS-2011 5/13

  20. K.Biljaković ECRYS-2011 3/13

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