High magneto-Seebeck effect at room temperature in Bi1.8Sb0.2Te3-ySey crystal

Abstract

We report thermoelectric and electrical transport properties of Bi 1.8 Sb 0.2 Te 3-y Se y by tuning y. In contrast to the reported p-type conductivity of the end compounds with y ¼ 0 and 3, a dominant n-type conduction mechanism is observed for y ¼ 1.5 from the Hall measurement. Intriguingly, the magneto-Seebeck consequence is enhanced up to $ 20 times for y ¼ 1.5 compared to the end members. The reasonable value of magnetoresistance with an anisotropic character with respect to the direction of the magnetic field is observed at low temperature, which decreases with increasing temperature. The density of state at the Fermi level near room temperature correlates high Seebeck coefficient as well as magneto-Seebeck effect. High magneto-Seebeck effect at room temperature is promising for the application.

Bulk Rashba Spin Splitting and Dirac Surface State in p‐Type (Bi0.9Sb0.1)2Se3 Single Crystal

“…Single crystal of (Bi 0.9 Sb 0.1 ) 2 Se 3 was grown using a modified Bridgman method. [17,18] Synchrotron diffraction study was performed on the powdered crystal with a wavelength of 0.20694 Å (60 keV) recorded at P02.1 beamline of PETRA III, Hamburg, Germany by using a Perkin Elmer XRD1621 area detector. DOI: 10.1002/pssr.202100494 Herein, bulk Rashba spin splitting (RSS) and associated Dirac surface state in (Bi 0.9 Sb 0.1 ) 2 Se 3 , exhibiting dominant p-type conductivity is reported.…”

“…Single crystal of (Bi 0.9 Sb 0.1 ) 2 Se 3 was grown using a modified Bridgman method. [ 17,18 ] Synchrotron diffraction study was performed on the powdered crystal with a wavelength of 0.20694 Å (60 keV) recorded at P02.1 beamline of PETRA III, Hamburg, Germany by using a Perkin Elmer XRD1621 area detector. The low temperature ( T ) studies were carried out by using a cryogen‐free JANIS (USA) cryostat.…”

Bulk Rashba spin splitting and Dirac surface state in $p$-type (Bi$_{0.9}$Sb$_{0.1})_2$Se$_3$ single crystal

“…Single crystal of (Bi 0.9 Sb 0.1 ) 2 Se 3 is grown by using a modified Bridgman method [17,18]. Synchrotron diffraction study is performed on the powdered crystal with a wavelength of 0.20694 Å (60 keV) recorded at P02.1 beamline of PETRA III, Hamburg, Germany by using a Perkin Elmer XRD1621 area detector.…”