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Apparent critical phenomena in the superionic phase transition of Cu_(2-x)Se

Kang, Stephen Dongmin and Danilkin, Sergey A. and Aydemir, Umut and Avdeev, Maxim and Studer, Andrew and Snyder, G. Jeffrey (2016) Apparent critical phenomena in the superionic phase transition of Cu_(2-x)Se. New Journal of Physics, 18 (1). Art. No. 013024. ISSN 1367-2630. http://resolver.caltech.edu/CaltechAUTHORS:20160408-142226165

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Abstract

The superionic phase transition of Cu_(2-x)Se accompanies drastic changes in transport properties. The Seebeck coefficient increases sharply while the electrical conductivity and thermal diffusivity drops. Such behavior has previously been attributed to critical phenomena under the assumption of a continuous phase transition. However, applying Landau's criteria suggests that the transition should be first order. Using the phase diagram that is consistent with a first order transition, we show that the observed transport properties and heat capacity curves can be accounted for and modeled with good agreement. The apparent critical phenomena is shown to be a result of compositional degree-of-freedom. Understanding of the phase transition allows to explain the enhancement in the thermoelectric figure-of-merit that is accompanied with the transition.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/1367-2630/18/1/013024DOIArticle
http://iopscience.iop.org/article/10.1088/1367-2630/18/1/013024/metaPublisherArticle
ORCID:
AuthorORCID
Snyder, G. Jeffrey0000-0003-1414-8682
Alternate Title:Apparent critical phenomena in the superionic phase transition of Cu2-xSe
Additional Information:© 2016 IOP Publishing. Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 30 September 2015; Revised 17 November 2015; Accepted for Publication 16 December 2015; Published 11 January 2016. The authors thank Prof Peter W Voorhees for his insightful comments and ANSTO (Australia) for the provision of beam time. UA acknowledges the financial assistance from The Scientific and Technological Research Council of Turkey. The work conducted at Caltech was supported by the AFOSR MURI program under FA9550-12-1-0002. The work conducted at Northwestern University was supported by the Solid-State Solar-Thermal Energy Conversion Center, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences (#DE-SC0001299).
Funders:
Funding AgencyGrant Number
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu (TÜBİTAK)UNSPECIFIED
Air Force Office of Scientific Research (AFOSR)FA9550-12-1-0002
Department of Energy (DOE)DE-SC0001299
Subject Keywords:phase transition, superioinic conductors, thermoelectrics, thermopower
Record Number:CaltechAUTHORS:20160408-142226165
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160408-142226165
Official Citation:Stephen Dongmin Kang et al 2016 New J. Phys. 18 013024
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:66031
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:12 Apr 2016 01:22
Last Modified:12 Apr 2016 22:38

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