Transport properties of Layer-Antiferromagnet CuCrS2: A possible thermoelectric material - Condensed Matter > Strongly Correlated ElectronsReport as inadecuate




Transport properties of Layer-Antiferromagnet CuCrS2: A possible thermoelectric material - Condensed Matter > Strongly Correlated Electrons - Download this document for free, or read online. Document in PDF available to download.

Abstract: The electrical, thermal conductivity and Seebeck coefficient of the quenched,annealed and slowly cooled phases of the layer compound CuCrS2 have beenreported between 15K to 300K. We also confirm the antiferromagnetic transitionat 40K in them by our magnetic measurements between 2K and 300K. The crystalflakes show a minimum around 100K in their in-plane resistance behavior. Forthe polycrystalline pellets the resistivity depends on their flaky texture andit attains at most 10 to 20 times of the room temperature value at the lowesttemperature of measurement. The temperature dependence is complex and nodefinite activation energy of electronic conduction can be discerned. We findthat the Seebeck coefficient is between 200-450 microV-K and is unusually largefor the observed resistivity values of between 5-100 mOhm-cm at roomtemperature. The figure of merit ZT for the thermoelectric application is 2.3for our quenched phases, which is much larger than 1 for useful materials. Thethermal conductivity K is mostly due to lattice conduction and is reduced bythe disorder in Cu- occupancy in our quenched phase. A dramatic reduction ofelectrical and thermal conductivity is found as the antiferromagnetictransition is approached from the paramagnetic region, and K subsequently risesin the ordered phase. We discuss the transport properties as being similar to adoped Kondo-insulator.



Author: G. C. Tewari, T. S. Tripathi, A. K. Rastogi

Source: https://arxiv.org/







Related documents