Enhanced Electron Scattering upon Ion Relocation in BaVS₃ at 69 K

• Main Authors: Ferenc Márkus, Bence G. Márkus
• Format: Article
• Language: English
• Published: MDPI AG 2019-08-01
• Series: Entropy
• Subjects: BaVS₃; metal-insulator transition; enhanced electron scattering
• Online Access: https://www.mdpi.com/1099-4300/21/8/813

The present study deals with the anomalous heat capacity peak and thermal conductivity of BaVS<inline-formula> <math display="inline"> <semantics> <msub> <mrow></mrow> <mn>3</mn> </msub> </semantics> </math> </inline-formula> near the metal-insulator transition present at 69 K. The transition is related to a structural transition from an orthorhombic to monoclinic phase. Heat capacity measurements at this temperature exhibit a significant and relatively broad peak, which is also sample dependent. The present study calculates the entropy increase during the structural transition and we show that the additional entropy is caused by enhanced electron scattering as a result of the structural reorientation of the nuclei. Within the model it is possible to explain quantitatively the observed peak alike structure in the heat capacity and in heat conductivity.