Growth, Characterization and High-Field Magneto-Conductivity of Co{sub 0.1}Bi{sub 2}Se{sub 3} Topological Insulator

We report the crystal growth as well as transport properties of Co added Bi{sub 2}Se{sub 3} (Co{sub 0.1}Bi{sub 2}Se{sub 3}) single crystals. The values of the lattice parameters for pure and Co added sample were nearly the same. The Raman spectroscopy displayed slightly higher Raman shift of corresp...

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Published inJournal of superconductivity and novel magnetism Vol. 32; no. 4
Main Authors Sultana, Rabia, Gurjar, Ganesh, Patnaik, S., Awana, V. P. S.
Format Journal Article
LanguageEnglish
Published United States 15.04.2019
Subjects
BISMUTH SELENIDES
COBALT COMPOUNDS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTAL GROWTH
ELECTRON SPIN RESONANCE
LATTICE PARAMETERS
MAGNETIC FIELDS
MAGNETISM
MAGNETORESISTANCE
MONOCRYSTALS
RAMAN SPECTROSCOPY
TOPOLOGY
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Summary:We report the crystal growth as well as transport properties of Co added Bi{sub 2}Se{sub 3} (Co{sub 0.1}Bi{sub 2}Se{sub 3}) single crystals. The values of the lattice parameters for pure and Co added sample were nearly the same. The Raman spectroscopy displayed slightly higher Raman shift of corresponding A{sub 1g}{sup 1}, Eg{sup 2}, and A{sub 1g}{sup 2} vibrational modes for Co{sub 0.1}Bi{sub 2}Se{sub 3}, and the resistivity curves with and without applied magnetic field show a metallic behavior. Both the crystals were subjected to magneto-resistance (MR) measurements under applied fields of 14 T. The value of MR is found to decrease from about 380% (5 K, 14 T) for Bi{sub 2}Se{sub 3} to 200% for Co{sub 0.1}Bi{sub 2}Se{sub 3}. To elaborate the transport properties of pure and Co added Bi{sub 2}Se{sub 3} crystals, the magneto-conductivity is fitted to the HLN (Hikami-Larkin-Nagaoka) equation, and it is found that the charge conduction is mainly dominated by surface-driven WAL (weak anti-localization) with negligible bulk WL (weak localization) contribution in both crystals alike. The MH curves of Co{sub 0.1}Bi{sub 2}Se{sub 3} crystal at different temperatures displayed a combination of both ferromagnetic and diamagnetic behavior. On the other hand, the electron paramagnetic resonance (EPR) revealed that pure Bi{sub 2}Se{sub 3} is diamagnetic, whereas Co orders ferromagnetically with resonating field around 3422 Oe at room temperature. The calculated value of Lande “g” factor is around 2.04 ± 0.05. Summarily, the short letter discusses the interesting magneto-conductivity and complex magnetism of Co in Co{sub 0.1}Bi{sub 2}Se{sub 3}.
ISSN:1557-1939
1557-1947