Pressure tuning of the anomalous Hall effect in the chiral antiferromagnet 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Mn</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mi>Ge</mml:mi></mml:mrow></mml:math>

Reis, R. D. dos; Zavareh, M. Ghorbani; Ajeesh, M. O.; Kutelak, Leonardo Oparacz; Sukhanov, A. S.; Singh, Sanjay; Noky, Jonathan; Sun, Yan; Fischer, Jürgen; Manna, Kaustuv; Felser, Claudia

doi:10.1103/physrevmaterials.4.051401

Cited by 21 publications

(17 citation statements)

References 35 publications

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“…Hydrostatic pressure, on the other hand, has been widely used to manipulate the lattice parameters and even to bring about a structural transition in a system. The present mechanism to manipulate AHE differs completely from the recent reports of AHE switching in antiferromagnets [43][44][45]. Switching of AHE in thin films of Mn 3 Pt relies on the structural distortion controlled through electrical response in a piezo-electrical substrate, whereas, in case of bulk Mn 3 Ge the underlying mechanism for the pressure induced sign change of AHE is still unknown.…”

Section: (E) [See Table II (Appendix A)contrasting

confidence: 69%

Pressure controlled trimerization for switching of anomalous Hall effect in triangular antiferromagnet Mn$_3$Sn

Singh,

Pradhan

et al. 2020

Preprint

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Here, we present a detailed theoretical and experimental study on the pressure induced switching of anomalous Hall effect (AHE) in the triangular antiferromagnetic (AFM) compound Mn3Sn. Our theoretical model suggests pressure driven significant splitting of the in-plane Mn bond lengths i.e. an effective trimerization, which in turn stabilizes a helical AFM ground state by modifying the inter-plane exchange parameters in the system. We experimentally demonstrate that the AHE in Mn3Sn reduces from 5 µΩ cm at ambient pressure to zero at an applied pressure of about 1.5 GPa. Furthermore, our pressure dependent magnetization study reveals that the conventional triangular AFM ground state of Mn3Sn systematically transforms into the helical AFM phase where the symmetry does not support a non-vanishing Berry curvature required for the realization of a finite AHE. The pressure dependent x-ray diffraction (XRD) study rules out any role of structural phase transition in the observed phenomenon. In addition, the temperature dependent in-plane lattice parameter at ambient pressure is found to deviate from the monotonic behavior when the system enters into the helical AFM phase, thereby, supporting the proposed impact of trimerization in controlling the AHE. We believe that the present study makes an important contribution towards understanding the stabilization mechanism of different magnetic ground states in Mn3Sn and related materials for their potential applications pertaining to AHE switching.

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Section: (E) [See Table II (Appendix A)contrasting

confidence: 69%

Pressure controlled trimerization for switching of anomalous Hall effect in triangular antiferromagnet Mn$_3$Sn

Singh,

Pradhan

et al. 2020

Preprint

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“…This also means that the breathing anisotropy may also affect certain properties of the magnetic phases. Furthermore, some recent works have been dedicated to the importance of the coupling between the elastic and magnetic degrees of freedom [87][88][89][90]. These are known to introduce effective biquadratic spin interactions, which would further complicate the theoretical analysis.…”

Section: Discussionmentioning

confidence: 99%

Magnetic interactions in AB-stacked kagome lattices: magnetic structure, symmetry, and duality

Zelenskiy¹,

Monchesky²,

Plumer³

et al. 2022

Preprint

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We present the results of an extensive study of the phase diagram and spin wave excitations for a general spin model on a hexagonal AB-stacked kagome system. The boundaries of the magnetic phases are determined via a combination of numerical (Monte Carlo) and analytical (Luttinger-Tisza) methods. We also determine the phase coexistence regions by considering the instabilities in the spin wave spectra. Depending on the strength of the spin-orbit coupling (SOC), some spin and lattice rotations become decoupled, leading to considerably larger symmetry groups than typical magnetic groups. Thus, we provide a detailed symmetry description of the magnetic Hamiltonian with negligible, weak, and intermediate strength of SOC. The spin symmetry in these three cases has a strong effect on the splittings observed in the spin excitation spectra. We further identify a number of self-duality transformations that map the Hamiltonian onto itself. These transformations describe the symmetry of the parameter space and provide an exact mapping between the properties of different magnetic orders and lead to accidental degeneracies. Finally, we discuss the physical relevance of our findings in the context of Mn3X compounds.

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“…These quantities were recently shown to be strongly strain dependent. For example, dos Reis et al [12] demonstrated the ability to change the sign of the Hall angle in Mn 3 Ge by applying hydrostatic pressure, and Ikhlas et al [13] switched the direction of the Hall effect in Mn 3 Sn by applying uniaxial strain. Additional evidence for large magnetoelastic coupling has been found in neutron diffraction studies [14], as well as in spontaneous magnetostriction at T N [15] in Mn 3 Ge.…”

Section: Introductionmentioning

confidence: 99%

Strong Magneto-Elastic Coupling in Mn$_3$X (X = Ge, Sn)

Theuss,

Ghosh,

Chen

et al. 2022

Preprint

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We measure the full elastic tensors of Mn3Ge and Mn3Sn as a function of temperature through their respective antiferromagnetic phase transitions. Large discontinuities in the bulk moduli at the Néel transitions indicate strong magnetoelastic coupling in both compounds. Strikingly, the discontinuities are nearly a factor of 10 larger in Mn3Ge than in Mn3Sn. We use the magnitudes of the discontinuities to calculate the pressure derivatives of the Néel temperature, which are 39 K/GPa 14.3 K/GPa for Mn3Ge and Mn3Sn, respectively. We measured in-plane shear modulus c66, which couples strongly to the magnetic order, in magnetic fields up to 18 T and found quantitatively similar behavior in both compounds. Recent measurements have demonstrated strong piezomagnetism in Mn3Sn: our results suggest that Mn3Ge may be an even better candidate for this effect.

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Pressure tuning of the anomalous Hall effect in the chiral antiferromagnet Mn3Ge

Cited by 21 publications

References 35 publications

Pressure controlled trimerization for switching of anomalous Hall effect in triangular antiferromagnet Mn$_3$Sn

Pressure controlled trimerization for switching of anomalous Hall effect in triangular antiferromagnet Mn$_3$Sn

Magnetic interactions in AB-stacked kagome lattices: magnetic structure, symmetry, and duality

Strong Magneto-Elastic Coupling in Mn$_3$X (X = Ge, Sn)

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