Thermoelectric power of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="normal">Ti</mi><mrow><msub><mrow><mi mathvariant="normal">Se</mi></mrow><mrow><mn>2</mn><mo>−</mo><mi>x</mi></mrow></msub></mrow><mrow><msub><mrow><mi mathvariant="normal">S</mi></mrow><mrow><mi>x</mi></mrow></msub></mrow></math></span> mixed crystals at low temperatures

Amir A. Lakhani; S. Jandl; C. Ayache; J. -P. Jay-Gerin

doi:10.1103/PhysRevB.28.1978

Thermoelectric power of $Ti {Se}_{2 - x} S_{x}$ mixed crystals at low temperatures

Amir A. Lakhani, S. Jandl, C. Ayache, and J. -P. Jay-Gerin

Phys. Rev. B 28, 1978 – Published 15 August 1983

Abstract

We present thermoelectric power (TEP) measurements, as a function of temperature in the range 7-450 K, of $Ti {Se}_{2 - x} S_{x}$ mixed crystals for $x = 0, 0.5, 0.75, 1, and 1.25$ . A pronounced negative minimum is observed near 150 K in the samples which exhibit the superlattice state. In contrast, in the nontransforming crystals, the TEP varies monotonically with temperature. We interpret the 150-K TEP dip in the transforming samples as due to a phonon-drag effect, in which the strong interaction between electrons and holes and the softening TA-phonon mode $L_{1}^{-}$ —the mode actually defining the $2 a_{0} \times 2 c_{0}$ superlattice condition—plays a primary role.

Received 4 May 1983

DOI:https://doi.org/10.1103/PhysRevB.28.1978

Authors & Affiliations

Amir A. Lakhani^* and S. Jandl

Groupe de Recherche sur les Semiconducteurs et les Diélectriques, Département de Physique, Faculté des Sciences, Université de Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada

C. Ayache

Laboratoire de Cryophysique, Service des Basses Températures, Centre d'Etudes Nucléaires de Grenoble, Boîte Postale 85X, F-38041 Grenoble Cédex, France

J. -P. Jay-Gerin

Groupe du Conseil de Recherches Médicales du Canada en Sciences des Radiations, Département de Médecine Nucléaire et de Radiobiologie, Faculté de Médecine, Université de Sherbrooke, Sherbrooke, Québec J1H 5N4, Canada
Département de Physique, Faculté des Sciences, Université de Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada

^*Present address: The Bendix Advanced Technology Center, 9140 Old Annapolis Rd/Md 108, Columbia, Maryland 21045.

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Vol. 28, Iss. 4 — 15 August 1983

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