Co-appearance of superconductivity and ferromagnetism in a Ca2RuO4 nanofilm crystal

Nobukane, Hiroyoshi; Yanagihara, Kosei; Kunisada, Yuji; Ogasawara, Yunito; Isono, Kakeru; Nomura, K.; Tanahashi, Keita; Nomura, Takahiro; Akiyama, Tomohiro; Tanda, Satoshi

doi:10.1038/s41598-020-60313-x

Cited by 24 publications

(19 citation statements)

References 74 publications

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“…Another confirmation of this statement comes from the recent fascinating discovery of high-temperature superconductivity in calcium ruthenate, Ca 2 RuO 4 [8]. The stoichiometric composition of this material in a singlecrystalline form is a Mott insulator, while single crystals with excess oxygen are metallic above 160 K [9].…”

Section: Introductionmentioning

confidence: 92%

Terahertz spectroscopy evidence of possible 40 K superconductivity in rhenium-doped strontium ruthenates

Aleshchenko,

Gorshunov,

Zhukova

et al. 2020

Preprint

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Strontium ruthenates have many similarities with copper oxide superconductors and are of particular interest for the investigation of the mechanisms and conditions which lead to high-temperature superconductivity. We report here on multiple experimental indications of superconductivity with onset at 40 K in strontium ruthenate doped by rhenium and selenium with chlorine used as the flux. The main experimental evidence arises from terahertz spectroscopy of this material followed by AC and DC magnetization, as well as measurements of its heat capacity and magnetoresistance. Structural and morphological studies revealed the heterophase nature of this polycrystalline material as well as the changes of lattice parameters relative to the original phases. Experimental data show a higher critical temperature on the surface compared to that of the bulk of the sample.

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Section: Introductionmentioning

confidence: 92%

Terahertz spectroscopy evidence of possible 40 K superconductivity in rhenium-doped strontium ruthenates

Aleshchenko,

Gorshunov,

Zhukova

et al. 2020

Preprint

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“…On the experimental side, several studies [128][129][130][131] found doping driven ferromagnetic state in Ca 2 RuO 4 ; interestingly, the recent work has reported also on signatures of superconductivity. 132 In compounds with 90 • bonding geometry, the hopping rules are different and interactions are frustrated; studies of doping effects in such systems may bring some surprises.…”

Section: B 90 • M-o-m Bonding Honeycomb Latticementioning

confidence: 99%

Spin-orbit-entangled electronic phases in 4$d$ and 5$d$ transition-metal compounds

Takayama,

Chaloupka,

Smerald

et al. 2021

Preprint

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Complex oxides with 4d and 5d transition-metal ions recently emerged as a new paradigm in correlated electron physics, due to the interplay between spin-orbit coupling and electron interactions. For 4d and 5d ions, the spin-orbit coupling, ζ, can be as large as 0.2-0.4 eV, which is comparable with and often exceeds other relevant parameters such as Hund's coupling JH, noncubic crystal field splitting ∆, and the electron hopping amplitude t. This gives rise to a variety of spin-orbitentangled degrees of freedom and, crucially, non-trivial interactions between them that depend on the d-electron configuration, the chemical bonding, and the lattice geometry. Exotic electronic phases often emerge, including spin-orbit assisted Mott insulators, quantum spin liquids, excitonic magnetism, multipolar orderings and correlated topological semimetals. This paper provides a selective overview of some of the most interesting spin-orbit-entangled phases that arise in 4d and 5d transition-metal compounds.

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“…Owing to their physical and chemical properties, alkali and alkaline earth ruthenates play an important role in magnetics. With regard to this family of compounds, researchers have previously studied the superconductivity of Sr2RuO4 [1], the ferromagnetic transition in Ca2RuO4 [2], and the anti-ferromagnetic behavior of Na2RuO4 [3]. These compounds form different crystalline lattices as influenced by varying external conditions such as temperature.…”

Section: Introductionmentioning

confidence: 99%

Lattice Parameters, Electronic, and Magnetic Properties of Cubic Perovskite Oxides ARuO3 (A=Sr, Rb): A First‑Principles Study

Younsi¹,

Gacem²,

Soltani³

2021

RCMA

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Trioxides of rubidium, strontium, and ruthenium belong to the family of alkali and alkaline earth ruthenates. SrRuO3 crystallizes in various symmetry classes—orthorhombic, tetragonal, or cubic—whereas RbRuO3 is perovskite (cubic) structured and crystallizes only in the cubic space group Pm3¯¯¯m(No. 221). In this study, we investigated the structural stability as well as the electronic and magnetic properties of two cubic perovskites SrRuO3 and RbRuO3. We established the corresponding lattice parameters, magnetic moments, density of states (DOS), and band structures using ab‑initio density‑functional theory (DFT). Both compounds exhibited a metallic ferromagnetic ground state with lattice parameter values between 3.83 and 3.96 Å; RbRuO3 had magnetic moments between 0.29 and 0.34 µBwhereas SrRuO3 had magnetic moments between 1.33 and 1.66 µB. This study paves way for further RbRuO3 research.

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Co-appearance of superconductivity and ferromagnetism in a Ca2RuO4 nanofilm crystal

Cited by 24 publications

References 74 publications

Terahertz spectroscopy evidence of possible 40 K superconductivity in rhenium-doped strontium ruthenates

Terahertz spectroscopy evidence of possible 40 K superconductivity in rhenium-doped strontium ruthenates

Spin-orbit-entangled electronic phases in 4$d$ and 5$d$ transition-metal compounds

Lattice Parameters, Electronic, and Magnetic Properties of Cubic Perovskite Oxides ARuO3 (A=Sr, Rb): A First‑Principles Study

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