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July 6, 2026
Ancient Craniiform Brachiopod: A Newly Discovered Species with a Unique Shell Shape and Lifestyle
Scientists from HSE University, MSU, and Tallinn University of Technology have studied a fossil species of ancient brachiopods that lived in a warm sea in what is now northern Estonia more than 445 million years ago. These ancient brachiopods developed a cup-shaped shell with a protective 'cap' that shielded them from overgrowth by other marine organisms. The study has been published in Palaeogeography, Palaeoclimatology, Palaeoecology.
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Charge Density and Mobility of Charge Density Waves in the Quasi-One-Dimensional Conductor NbS3

JETP Letters. 2023. Vol. 117. No. 2. P. 157–163.
Zybtsev n., Pokrovskii V. Y., Nikonov n., Maizlakh n., Zaitsev-Zotov S.

Three charge density waves (CDWs), two of which are formed above room temperature, are observed in the NbS3 monoclinic phase (NbS3-II). The charge density and mobility in the high-field limit have been determined for each of three CDWs in this work using the synchronization effect of CDWs in high-frequency fields. It has been found that the mobility of each CDW in this limit is approximately equal to the normal-state mobility of quasiparticles condensed in it. Furthermore, correlation has been observed between the temperature dependences of mobilities of CDWs and quasiparticles. The results of this work refresh problems of a mechanism of the limit conductivity of CDWs and of the distribution of CDWs between atomic chains in the unit cell.

Research target: Physics
Language: English
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Keywords: Фазовый переходподвижность носителей зарядаcharge-carrier mobilityphase transitionscharge density waveволна зарядовой плотностиPeierls transitionпайерлсовский переход
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