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Fobes, David; Jin, Peng; Qu, Zhe; Liu, T. J.; Mao, Zhiqiang

doi:10.1103/physrevb.84.014406

Cited by 10 publications

(10 citation statements)

References 31 publications

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“…The results of our bulk measurements refine the published phase diagram of Ca 3 Ru 2 O 7 in the region between the lines separating AFM b and CAFM states [26][27][28]. Until now most of the neutron scattering measurements on Ca 3 Ru 2 O 7 were performed at finite wavevectors.…”

Section: Introductionsupporting

confidence: 84%

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Metamagnetic texture in a polar antiferromagnet

Sokolov¹,

Kikugawa²,

Helm³

et al. 2019

Nat. Phys.

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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 spinorders 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. Our findings provide an example of a rich and largely unexplored class of textured states. Such textures mediate between different ordering modes near phase co-existence, and engender extremely rich phase diagrams.

show abstract

Section: Introductionsupporting

confidence: 84%

“…Summarizing the experiments, Ca 3 Ru 2 O 7 displays a spirally-modulated magnetic order in broad temperature-field region, previously regarded as a crossover [22,28]. The propagation vector of the spiral is aligned perpendicular to the magnetic field and the staggered magnetization is likely parallel to it.…”

Section: Introductionmentioning

confidence: 69%

Metamagnetic texture in a polar antiferromagnet

Sokolov¹,

Kikugawa²,

Helm³

et al. 2019

Nat. Phys.

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show abstract

“…This small value of γ e is consistent with the previously reported value (∼ 1.7 mJ/(Ru mol K 2 )) for floating-zone grown single crystals 18 and should be attributed to the non-nested small Fermi pockets surviving from the MIT. 23 However, the samples doped with 1% and 2% Ti exhibit distinct behavior in comparison with Ca 3 Ru 2 O 7 . Their specific heat values are much greater.…”

Section: Resultsmentioning

confidence: 97%

From quasi-two-dimensional metal with ferromagnetic bilayers to Mott insulator with G-type antiferromagnetic order in Ca3(Ru1−xTi
Jin
¹
,
Ke
²
,
Wang
³

et al. 2013
Phys. Rev. B
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23
4
35
0
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We report the electronic and magnetic phase diagram of Ca3(Ru1−xTix)2O7. With Ti doping, the system evolves from a quasi-2D metal with ferromagnetic (FM) bilayers coupled antiferromagnetically along the c-axis (AFM-b) for x = 0, to a weakly localized state for 0 < x < 0.05 and finally to a Mott insulator with G-type antiferromagnetic (G-AFM) order for x ≥ 0.05. The magnetic state switching from the AFM-b to the G-AFM occurs in the weakly localized state near x = 0.03. We show that such a magnetic transition is controlled by the charge carrier itinerancy and can be understood in light of competing interactions between FM double-exchange and AFM superexchange. An incommensurate component is also observed due to competing magnetic interactions.

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“…At T MIT , the magnetic moments reorient to align parallel to the b axis while keeping the overall magnetic ordering, forming the so-called AFM-b state. The c-axis magnetoresistance is different between the two orientations of the AFM order and exhibits a pronounced temperature dependence around the transition temperatures [19]. This has been attributed to the strong spin-charge coupling in the material [17,36].…”

Section: (C) Ca 3 Ru 2 Omentioning

confidence: 99%

“…Several different magnetic dipole orders are known to exist as a function of temperature [14][15][16][17][18], allowing us to search for a relationship between dipolar and multipolar magnetic arrangements. Additionally, because of its strong spin-charge coupling, Ca 3 Ru 2 O 7 shows highly anisotropic magnetoresistance [19] as well as twodimensional conductivity at low temperatures; we explore whether these properties can be related to the behaviour of the magnetoelectric multipoles.…”

Section: Introductionmentioning

confidence: 99%

Magnetoelectric multipoles in metals

Thöle¹,

Spaldin²

2018

Phil. Trans. R. Soc. A.

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We demonstrate computationally the existence of magnetoelectric multipoles, arising from the second order term in the multipole expansion of a magnetization density in a magnetic field, in noncentrosymmetric magnetic metals. While magnetoelectric multipoles have long been discussed in the context of the magnetoelectric effect in noncentrosymmetric magnetic insulators, they have not previosuly been identified in metallic systems, in which the mobile carriers screen any electrical polarization. Using first-principles density functional calculations we explore three specific systems: First, a conventional centrosymmetric magnetic metal, Fe, in which we break inversion symmetry by introducing a surface, which both generates magnetoelectric monopoles and allows a perpendicular magnetoelectric response. Next, the hypothetical cation-ordered perovskite, SrCaRu2O6, in which we study the interplay between the magnitude of the polar symmetry breaking and that of the magnetic dipoles and multipoles, finding that both scale proportionally to the structural distortion. Finally, we identify a hidden antiferromultipolar order in the noncentrosymmetric, antiferromagnetic metal Ca3Ru2O7, and show that, while its competing magnetic phases have similar magnetic dipolar structures, their magnetoelectric multipolar structures are distinctly different, reflecting the strong differences in transport properties. arXiv:1804.06314v1 [cond-mat.mtrl-sci]

show abstract

Magnetic phase transitions and bulk spin-valve effect tuned by in-plane field orientation in Ca3Ru2O

Cited by 10 publications

References 31 publications

Metamagnetic texture in a polar antiferromagnet

Metamagnetic texture in a polar antiferromagnet

From quasi-two-dimensional metal with ferromagnetic bilayers to Mott insulator with G-type antiferromagnetic order in Ca3(Ru1−xTi
Jin
¹
,
Ke
²
,
Wang
³

et al. 2013
Phys. Rev. B
Self Cite
23
4
35
0
View full text Add to dashboard Cite

Magnetoelectric multipoles in metals

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Magnetic phase transitions and bulk spin-valve effect tuned by in-plane field orientation in Ca3Ru2O

Cited by 10 publications

References 31 publications

Metamagnetic texture in a polar antiferromagnet

Metamagnetic texture in a polar antiferromagnet

From quasi-two-dimensional metal with ferromagnetic bilayers to Mott insulator with G-type antiferromagnetic order in Ca3(Ru1−xTiJin1, Ke2, Wang3 et al. 2013Phys. Rev. BSelf Cite234350View full textAdd to dashboardCite

Magnetoelectric multipoles in metals

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From quasi-two-dimensional metal with ferromagnetic bilayers to Mott insulator with G-type antiferromagnetic order in Ca3(Ru1−xTi
Jin
¹
,
Ke
²
,
Wang
³

et al. 2013
Phys. Rev. B
Self Cite
23
4
35
0
View full text Add to dashboard Cite