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Anomalous Hall Effect and Magnetoresistance in Sputter‐Deposited Magnetic Weyl Semimetal Co 2 TiGe Thin Films
Author(s) -
Dyck Denis,
Becker Andreas,
Koo Jungwoo,
Matalla-Wagner Tristan,
Krieft Jan,
Reiss Günter
Publication year - 2021
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.202000067
Subject(s) - condensed matter physics , magnetoresistance , hall effect , residual resistivity , curie temperature , scattering , magnetization , electrical resistivity and conductivity , weyl semimetal , semimetal , materials science , ferromagnetism , physics , magnetic field , superconductivity , band gap , optics , quantum mechanics
Herein, sputter‐deposited ferromagnetic Weyl semimetal (WSM) and full‐Heusler compound Co 2 TiGe is investigated. Crystal quality is analyzed using X‐ray diffraction and reflectivity. In addition, temperature‐dependent transport and magnetization measurements are carried out. The sample shows indications on the formation of L2 1 crystal structure. Magnetization measurements show a saturation magnetization of 1.98 μ B (f.u.) −1 and 1.45 μ B (f.u.) −1 at 50 and 300 K, respectively. This is in close agreement to the calculated value of 2 μ B (f.u.) −1 at 0 K using the Slater–Pauling rule. The obtained Curie temperature is 378.5 K, which is close to prior results for bulk samples. The residual resistivity of 142.7 μΩ cm is mainly dominated by disorder scattering. At temperatures above 60 K, the Coulomb interaction dominates the resistance. The residual resistance ratio is around 1.49. Hall measurements show positive ordinary Hall and anomalous Hall constants and a positive dependence on temperature. Skew scattering and side jumps or intrinsic mechanisms contribute in similar amounts to the anomalous Hall resistivity, which indicates a higher than usual intrinsic contribution, which is expected for WSMs. The expected relation between the longitudinal and the anomalous Hall conductivity ofσ xy A ∝ σ xx 0is not met.