Simultaneous loss of interlayer coherence and long-range magnetism in quasi-two-dimensional PdCrO2

Ghannadzadeh, Saman; Licciardello, S.; Arsenijević, Stevan; Robinson, P.C.; Takatsu, Hiroshi; Katsnelson, M. I.; Hussey, N. E.

doi:10.1038/ncomms15001

Cited by 15 publications

(15 citation statements)

References 38 publications

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“…[ 2,15–17 ] Moreover, as the isostructural compounds, PtCoO 2 has the lowest room temperature resistivity amongst the oxide system known, [ 1 ] and PdCrO 2 shows strong coupling between the antiferromagnetism and the conduction electrons. [ 18,19 ] Growing PtCoO 2 and PdCrO 2 thin films will expand the fundamental investigations and further potential applications of metallic delafossite oxides. In fact, thin films of PtCoO 2 and PdCrO 2 have been fabricated by rf‐sputtering about 40 years ago, [ 20 ] but the room temperature conductivity is around one order of magnitude inferior than recent reported single‐crystals.…”

Section: Introductionmentioning

confidence: 99%

Solution‐Processable Epitaxial Metallic Delafossite Oxide Films

Wei

Gong

Zhao

et al. 2020

Adv Funct Materials

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Metallic delafossites ABO2, as the new benchmark of ultra‐high conductive oxides, have recently attracted great interest. The harsh processing conditions and dimensional sizes obviously limit the fundamental sciences and technological applications. Here, a low‐cost and facile solution approach is realized to synthesize epitaxial metallic ABO2 thin films including PtCoO2, PdCoO2, and PdCrO2 with a dimension up to two‐inches in diameter, showing ultra‐high room temperature conductivity. The electrical properties, growth mechanisms, and potential technical applications including transparent conducting films and hydrogen evolution reaction activity are unveiled. The achievements of epitaxial metallic delafossites ABO2 thin films through solution methods will pave the route to producing wafer‐scaled ultra‐high conductive metallic delafossites.

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Section: Introductionmentioning

confidence: 99%

Solution‐Processable Epitaxial Metallic Delafossite Oxide Films

Wei

Gong

Zhao

et al. 2020

Adv Funct Materials

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“…To describe qualitatively these anomalous properties, the model of completely localized Cr spins (which corresponds to the s − d exchange model [7,8] when treating the electronic characteristics) was used in Refs. [5,6]. However, the situation can be more complicated.…”

Section: Introductionmentioning

confidence: 99%

“…Also, first-principles dynamical mean-field theory (DMFT) calculations [10] show that, despite that the Cr d − electron subsystem is strongly correlated and lies on the insulating side of Mott transition, they are pretty far from the atomic limit assumed in Refs. [5,6]. Last but not least, it follows from the theory of quasi-two-dimensional magnets [11] that such a high ratio |θ |/T N corresponds to enormously strong anisotropy of exchange interactions, which may be difficult to expect in systems with a three-dimensional metallic Fermi surface clearly seen at low temperatures [6] and therefore with (supposedly) Ruderman-Kittel-Kasuya-Yosida (RKKY)-type exchange interactions [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…[5,6]. Last but not least, it follows from the theory of quasi-two-dimensional magnets [11] that such a high ratio |θ |/T N corresponds to enormously strong anisotropy of exchange interactions, which may be difficult to expect in systems with a three-dimensional metallic Fermi surface clearly seen at low temperatures [6] and therefore with (supposedly) Ruderman-Kittel-Kasuya-Yosida (RKKY)-type exchange interactions [7,8]. From a general point of view, it is much easier to expect a very large anisotropy due to a strong suppression of interlayer hopping and interactions in exotic [non-Fermi-liquid (NFL)] phases of strongly correlated systems [12][13][14], especially in combination with magnetic frustrations [15].…”

Section: Introductionmentioning

confidence: 99%

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Unconventional magnetism and electronic state in the frustrated layered system PdCrO2

et al. 2020

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First-principles calculations and a model consideration of magnetically frustrated layered material PdCrO 2 are performed. The results on the exchange parameters are in agreement with the experimental data on the Curie-Weiss temperature (θ). We show that experimentally observed strong suppression of the Néel temperature (T N) in comparison with the Curie-Weiss temperature is due to three main factors. First, as expected, this is connected with the layered structure and relatively small exchange interaction along the c axis. Second, deformation of the ideal in-plane 120 • magnetic structure is crucial to provide finite T N value. However, these two factors are still insufficient to explain low T N and the large frustration factor |θ|/T N. Thus, we suggest a scenario of an exotic non-Fermi-liquid state in PdCrO 2 above T N within the frameworks of the Anderson lattice model, which seems to explain qualitatively all its main peculiarities.

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“…However Cr sites in each layer are centered between the Cr sites in adjacent layers, which frustrates the interlayer coupling. As the temperature is reduced to just above T N = 38 K, the in-plane correlation length grows to ∼20 lattice spacings without appearance of interplane coherence [8,9]. Then at T N the layers lock together to form long-range order at a transition that appears to be weakly first-order [5,24].…”

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confidence: 99%

Magnetic frustration and spontaneous rotational symmetry breaking in PdCrO2

et al. 2019

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In the triangular layered magnet PdCrO2 the intralayer magnetic interactions are strong, however the lattice structure frustrates interlayer interactions. In spite of this, long-range, 120 • antiferromagnetic order condenses at TN = 38 K. We show here through neutron scattering measurements under in-plane uniaxial stress and in-plane magnetic field that this occurs through a spontaneous lifting of the three-fold rotational symmetry of the nonmagnetic lattice, which relieves the interlayer frustration. We also show through resistivity measurements that uniaxial stress can suppress thermal magnetic disorder within the antiferromagnetic phase.At 24 K, solid oxygen undergoes a simultaneous Néel transition and rhombohedral to monoclinic structural transition [1,2]. The structural transition is driven by magnetic frustration: the monoclinic distortion introduces a preferred direction that relieves interlayer frustration [3]. The delafossite compound PdCrO 2 is also a rhombohedral system with interlayer magnetic frustration. The Cr sites in each layer are triangularly coordinated, and host S = 3 2 spins that start to arrange themselves into short-range, 120 • antiferromagnetic order at 200-300 K [4-7]. However Cr sites in each layer are centered between the Cr sites in adjacent layers, which frustrates the interlayer coupling. As the temperature is reduced to just above T N = 38 K, the in-plane correlation length grows to ∼20 lattice spacings without appearance of interplane coherence [8,9]. Then at T N the layers lock together to form long-range order at a transition that appears to be weakly first-order [5,24]. By analogy with solid oxygen and a related compound, CuCrO 2 [10], this could through a spontaneous rotational symmetry breaking and associated structural distortion that relieves interlayer frustration. However so far no structural distortion has been detected in PdCrO 2 [6,11].It is an important point to resolve, to understand the mechanisms by which magnetic order condenses on frustrated lattices, and here we take a different approach: using symmetry-breaking fields to polarize domains, if they are present. We employ neutron scattering measurements under in-plane uniaxial stress and magnetic field, and resistivity measurements under uniaxial stress. In PdCrO 2 the CrO 2 layers are Mott insulating, but are interleaved with highly conducting Pd sheets [12]. Com-parison with PdCoO 2 , which is nonmagnetic but otherwise has a nearly identifal Fermi surface (including the Fermi velocity) to PdCrO 2 , shows that magnetic scattering is the largest component of the inelastic resistivity of PdCrO 2 [5].In Fig. 1(a) we illustrate the nonmagnetic lattice. The nonmagnetic unit cell contains three layers: the offset of the Cr layers with respect to each other introduces an ABCABC stacking. The √ 3 × √ 3 reconstruction associated with 120 • magnetic order is observed in quantum oscillation [5,13], angle-resolved photoemission [12,14], and neutron data [4,11]; early signs of it appear at ∼60 K [15]. The neutron data also s...

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Simultaneous loss of interlayer coherence and long-range magnetism in quasi-two-dimensional PdCrO2

Cited by 15 publications

References 38 publications

Solution‐Processable Epitaxial Metallic Delafossite Oxide Films

Solution‐Processable Epitaxial Metallic Delafossite Oxide Films

Unconventional magnetism and electronic state in the frustrated layered system PdCrO2

Magnetic frustration and spontaneous rotational symmetry breaking in PdCrO2

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