Thermal avalanches near a Mott transition

Lashley, J. C. and Gofryk, K. and Mihaila, B. and Smith, J. L. and Salje, E. K. H. (2014) Thermal avalanches near a Mott transition. Journal of Physics: Condensed Matter, 26 (3). 035701. ISSN 0953-8984 DOI

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We probe the volume collapse transition (ΔV/Vo ~ 15%) between the isostructural γ and α phases (T ~ 100 K) of Ce0.9Th0.1 using the Hall effect, three-terminal capacitive dilatometry, and electrical resistivity measurements. Hall effect measurements confirm the itinerant ground state as the carrier concentration increases by a factor of 7 in the α phase, γ phase (nH = 5.28 × 1026 m−3), and the α phase (nH = 3.76 × 1027 m−3). We were able to detect a noise spectrum consisting of avalanches while slowly varying the temperature through the hysteretic region. We surmise that the avalanches originate from intergranular stresses at the interfaces between partially transformed high-volume and low-volume phases. The statistical distribution of avalanches obey power laws with energy exponent epsilon sime 1.5. Hall effect measurements, combined with universal critical exponents, point to short electron mean-free percolation pathways and carrier localization at phase interfaces. Carrier localization was predicted many years ago for elemental cerium by Johansson (1974 Phil. Mag. 30 469).

Item Type: Article
Uncontrolled Keywords: 2013AREP; IA67;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Journal of Physics: Condensed Matter
Volume: 26
Page Range: 035701
Identification Number:
Depositing User: Sarah Humbert
Date Deposited: 05 May 2014 15:12
Last Modified: 09 May 2014 14:42

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