New Dichalcogenides Rh1-xPdxTe2, Ir1-xPdxTe2 and Rh1-xIrxTe2 with (0 ≤ x ≤ 1): crystallographic analysis and thermoelectric and magnetic studies

LURGO, FLORENCIA E.; CARBONIO, RAÚL E.; SÁNCHEZ, RODOLFO D.

Bariloche

Conferencia; International workshop on Spintronics; 2022

CNEA

We have been synthetized new dichalcogenides families Rh1-xPdxTe2, Pd1-xIrxTe2 and Rh1-xIrxTe2. The chemical precursors in evacuated and sealed quartz ampoules have been heated and after were quenched to liquid nitrogen temperature. All the compounds show a P3 ̅m1 (space group 164) hexagonal rearrangement. The compound IrTe2 presents a first order structural transition close to 280K (P3 ̅m1 to P1 ̅), which has been monitored by diffraction using synchrotron light as source of X-ray [1]. SEM images show “small bubbles” in the crystals of the compounds that contain only Te, this can be interpreted as a small excess of Te, which has not detected for standard X-ray techniques. We report electric and thermoelectric properties for all the compounds. For all the studied families, the electrical resistivity shows quadratic temperature (ρ ~T2) dependence at low temperature, which is due to electron-electron interactions in a Fermi liquid picture. Seebeck coefficient (S) data indicate hole-type carriers. The electronic thermal conductivity (κₑ) was determined by Wiedemann-Franz law. The magnetic susceptibilities (χ vs T) are enhanced of the expected Pauli paramagnetism behavior for an electron gas. Both, the magnetic and electrical resistivity behaviors can associate with a Fermi liquid picture in metals.