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Title: Prediction of a magnetic Weyl semimetal without spin-orbit coupling and strong anomalous Hall effect in the Heusler compensated ferrimagnet Ti 2 MnAl

Journal Article · · Physical Review. B
 [1];  [2];  [3];  [4];  [5];  [2];  [6];  [3];  [3]
  1. Max Planck Inst. for Chemical Physics of Solids, Dresden (Germany); ShanghaiTech Univ. (China)
  2. Princeton Univ., NJ (United States)
  3. Max Planck Inst. for Chemical Physics of Solids, Dresden (Germany)
  4. Max Planck Inst. for Chemical Physics of Solids, Dresden (Germany); Leibniz Inst. for Solid State and Materials Research, Dresden (Germany)
  5. Leibniz Inst. for Solid State and Materials Research, Dresden (Germany); IFW Dresden (Germany)
  6. Leibniz Inst. for Solid State and Materials Research, Dresden (Germany)

We predict a magnetic Weyl semimetal in the inverse Heusler Ti2MnAl, a compensated ferrimagnet with a vanishing net magnetic moment and a Curie temperature of over 650 K. Despite the vanishing net magnetic moment, we calculate a large intrinsic anomalous Hall effect (AHE) of about 300 S/cm. It derives from the Berry curvature distribution of the Weyl points, which are only 14 meV away from the Fermi level and isolated from trivial bands. Different from antiferromagnets Mn3 X (X=Ge, Sn, Ga, Ir, Rh, and Pt), where the AHE originates from the noncollinear magnetic structure, the AHE in Ti2MnAl stems directly from the Weyl points and is topologically protected. The large anomalous Hall conductivity (AHC) together with a low charge carrier concentration should give rise to a large anomalous Hall angle. In contrast to the Co-based ferromagnetic Heusler compounds, the Weyl nodes in Ti2MnAl do not derive from nodal lines due to the lack of mirror symmetries in the inverse Heusler structure. Since the magnetic structure breaks spin-rotation symmetry, the Weyl nodes are stable without SOC. Moreover, because of the large separation between Weyl points of opposite topological charge, the Fermi arcs extent up to 75% of the reciprocal lattice vectors in length. Furthermore, this makes Ti2MnAl an excellent candidate for the comprehensive study of magnetic Weyl semimetals. It is the first example of a material with Weyl points, large anomalous Hall effect, and angle despite a vanishing net magnetic moment.

Research Organization:
Princeton Univ., NJ (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0017865
OSTI ID:
1860493
Alternate ID(s):
OSTI ID: 1421998
Journal Information:
Physical Review. B, Vol. 97, Issue 6; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 65 works
Citation information provided by
Web of Science

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Investigation of the structural competing and atomic ordering in Heusler compounds Fe 2 NiSi and Ni 2 FeSi under strain condition journal September 2019
Multifold nodal points in magnetic materials journal October 2019
Structural, Electronic, Magnetic, Mechanic and Thermodynamic Properties of the Inverse Heusler Alloy Ti2NiIn Under Pressure journal November 2018
Multifold nodal points in magnetic materials text January 2019
Large anomalous Nernst effect in thin films of the Weyl semimetal Co 2 MnGa journal November 2018
Ideal type-II Weyl phonons in wurtzite CuI journal August 2019
Giant magnetoresistance ratio in a current-perpendicular-to-plane spin valve based on an inverse Heusler alloy Ti 2 NiAl journal January 2019
Strain Conditions for the Inverse Heusler Type Fully Compensated Spin-Gapless Semiconductor Ti2MnAl: A First-Principles Study journal October 2018
Topology analysis for anomalous Hall effect in the noncollinear antiferromagnetic states of Mn 3 A N ( A = Ni ,   Cu ,   Zn ,   Ga ,   Ge ,   Pd ,   In ,   Sn ,   Ir ,   Pt ) journal September 2019
Time-reversal symmetry breaking type-II Weyl state in $YbMnBi_{2}$ text January 2019
Strong anomalous Nernst effect in collinear magnetic Weyl semimetals without net magnetic moments journal June 2018
Spin-to-charge conversion in magnetic Weyl semimetals text January 2019
Electric-Field Control of Magnetic Order: From FeRh to Topological Antiferromagnetic Spintronics text January 2018
Heusler, Weyl and Berry journal July 2018
Linear Response in Topological Materials text January 2020