Metamagnetic texture in a polar antiferromagnet

Abstract

The notion of a simple ordered state implies homogeneity. If the order is established by a broken symmetry, elementary Landau theory of phase transitions shows that only one symmetry mode describes this state. Precisely at points of phase coexistence domain states formed of large regions of different phases can be stabilized by long range interactions. In uniaxial antiferromagnets the so-called metamagnetism is an example of such a behavior, when an antiferromagnetic and field-induced spin-polarized paramagnetic/ferromagnetic state co-exist at a jump-like transition in the magnetic phase diagram. Here, combining experiment with theoretical analysis, we show that a different type of mixed state between antiferromagnetism and ferromagnetism can be created in certain acentric materials. In the small-angle neutron scattering experiments we observe a field-driven spin-state in the layered antiferromagnet Ca3Ru2O7, which is modulated on a scale between 8 and 20 nm and has both antiferromagnetic and ferromagnetic parts. We call this state a metamagnetic texture and explain its appearance by the chiral twisting effects of the asymmetric Dzyaloshinskii-Moriya (DM) exchange. The observation can be understood as an extraordinary coexistence, in one thermodynamic state, of spin orders belonging to different symmetries. Experimentally, the complex nature of this metamagnetic state is demonstrated by measurements of anomalies in electronic transport which reflect the spin-polarization in the metamagnetic texture, determination of the magnetic orbital moments, which supports the existence of strong spin-orbit effects, a pre-requisite for the mechanism of twisted magnetic states in this material.

arXiv commentSupplementary materials included

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Cited by in corpus (19)

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• Spontaneous cycloidal order mediating a spin-reorientation transition in a polar metal
• Antiskyrmions and their electrical footprint in crystalline mesoscale structures of Mn${}_{1.4}$PtSn
• Spin and charge excitations in the correlated multiband metal Ca3Ru2O7
• Complex magnetic phases in polar tetragonal intermetallic NdCoGe${}_3$
• Magnetic Phase Diagram of Rouaite, Cu${}_2$(OH)${}_3$NO${}_3$
• Two-carrier Magnetoresistance: Applications to Ca${}_3$Ru${}_2$O${}_7$
• Correlations between stacked structures and weak itinerant magnetic properties of La${}_{2-x}$ Y${}_x$ Ni${}_7$ compounds
• Field Induced Modulated State in the Ferromagnet PrPtAl
• Cascade of Spin Moiré Superlattices with In-Plane Field in Triangle Lattice Semimetal EuAg${}_4$Sb${}_2$
• Photoinduced phase switching at a Mott insulator-to-metal transition
• Probing Hidden Symmetry and Altermagnetism with Sub-Picometer Sensitivity via Nonlinear Transport
• High temperature antiferromagnetism in ultrathin SrRu2O6 nanosheets
• A simplified method characterizing magnetic ordering modulated photo-thermoelectric response in noncentrosymmetric semimetal Ca3Ru2O7
• Search for pressure-induced tricriticality in Cr
• Charge disproportionation as a possible mechanism towards polar antiferromagnetic metal in molecular orbital crystal