Colossal Magnetoresistance in a Mott Insulator via Magnetic Field-Driven Insulator-Metal Transition

Zhu, Mengze; Jin, Peng; Zou, Tao; Prokeš, K.; Mahanti, S. D.; Hong, Tao; Mao, Zhiqiang; Liu, G. Q.; Ke, Xianglin

doi:10.1103/physrevlett.116.216401

Cited by 28 publications

(32 citation statements)

References 42 publications

(61 reference statements)

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“…In this phase diagram, the B C and T IMT are utilized as phase boundary. At low temperatures below 20 K, [17,21]. As revealed by the magneto-optical spectra observed here, the temperature and magnetic field induced IMT were accompanied by a variation of AFM/FO configurations of Ru 4d orbitals.…”

Section: Resultssupporting

confidence: 51%

“…In these G-AFM Mott insulating state ruthenates, the T IMT and B C have positive correlation with different doping concentrations. For example, the T IMT was 46 K for 3% Ti-doped Ca 3 Ru 2 O 7 [18], and 82 K for 5% Ti-doped Ca 3 Ru 2 O 7 [21]. Meanwhile, the B C increased consistently.…”

Section: Resultsmentioning

confidence: 96%

“…With about 3% Ti or 4% Mn doping, the magnetic ground state switches to a G-type AFM state which is characterized by the nearest-neighbor AFM coupling for both the in-plane and c-axis directions [18][19][20] Meanwhile, the electronic state experiences a transition from quasi-2D metal to a Mott insulator. This Mott insulating state induced by chemical doping can also be suppressed by external magnetic field or hydrostatic pressure [21,22]. This is an uncommon phenomenon.…”

Section: Introductionmentioning

confidence: 96%

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Optical spectroscopy study of Ca3(Ru0.91Mn0.09)2O7 single crystal in high magnetic fields

Xu¹,

Jin²,

Zhang³

et al. 2019

Science Bulletin

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a b s t r a c tThe magneto-optical spectrum, with magnetic fields up to 42 T, of double layered ruthenates Ca 3 (Ru 0.91 Mn 0.09 ) 2 O 7 (CRMO) single crystal is studied. Both the temperature and magnetic field induced insulator-to-metal transitions (IMTs) are observed via magneto-optical properties of the crystal. The critical magnetic field (H // c) of IMT for CRMO is found to be as large as 35 T at 5 K. The fine structure of optical spectra identified the antiferromagnetic/ferro-orbital-ordering configurations of Ru 4d orbitals at low temperatures. Meanwhile, the configuration of orbital polarization of such double-layer CRMO single crystal is discussed. These results suggest that the orbital degree of freedom plays an important role in the field induced IMT of multi-orbital system.

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Section: Resultssupporting

confidence: 51%

Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 96%

See 1 more Smart Citation

Optical spectroscopy study of Ca3(Ru0.91Mn0.09)2O7 single crystal in high magnetic fields

Xu¹,

Jin²,

Zhang³

et al. 2019

Science Bulletin

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show abstract

“…When the magnetic field grows strong enough, Mott-like behavior disappears, and meanwhile, the system exhibits metallic behavior. A magnetic field-induced IMT for a Mott system, namely a bilayer ruthenate, Ti-doped Ca 3 Ru 2 O 7 , was presented in [39]. Our analysis for IMT is rather qualitative, and it deserves future more detailed studies.…”

Section: Discussionmentioning

confidence: 89%

Holographic DC conductivity for backreacted nonlinear electrodynamics with momentum dissipation

Wang

Yang

2019

Eur. Phys. J. C

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We consider a holographic model with the charge current dual to a general nonlinear electrodynamics (NLED) field. Taking into account the backreaction of the NLED field on the geometry and introducing axionic scalars to generate momentum dissipation, we obtain expressions for DC conductivities with a finite magnetic field. The properties of the in-plane resistance are examined in several NLED models. For Maxwell-Chern-Simons electrodynamics, negative magneto-resistance and Mott-like behavior could appear in some parameter space region. Depending on the sign of the parameters, we expect the NLED models to mimic some type of weak or strong interactions between electrons. In the latter case, negative magneto-resistance and Mott-like behavior can be realized at low temperatures. Moreover, the Mott insulator to metal transition induced by a magnetic field is also observed at low temperatures.

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“…The structural and magnetic properties of Ca 3 Ru 2 O 7 have been investigated previously using density functional calculations 18,[37][38][39][40] , and the calculated properties were found to depend strongly on the choice of Hubbard U . In all calculations, the magnetic ground state was found to have the magnetic ordering of the AFM-b phase.…”

Section: Ca3ru2o7mentioning

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]

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Colossal Magnetoresistance in a Mott Insulator via Magnetic Field-Driven Insulator-Metal Transition

Cited by 28 publications

References 42 publications

Optical spectroscopy study of Ca3(Ru0.91Mn0.09)2O7 single crystal in high magnetic fields

Optical spectroscopy study of Ca3(Ru0.91Mn0.09)2O7 single crystal in high magnetic fields

Holographic DC conductivity for backreacted nonlinear electrodynamics with momentum dissipation

Magnetoelectric multipoles in metals

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