Highly anisotropic magnetism in Cr-doped perovskite ruthenates

Durairaj, V.; Saito, Chikara; Lin, X. N.; Douglass, Angela; Cao, Gang; Schlottmann, P.; Choi, Eun Sang; Guertin, R. P.

doi:10.1103/physrevb.73.214414

Cited by 39 publications

(38 citation statements)

References 40 publications

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“…[1][2][3][4] The p-wave superconductor Sr 2 RuO 4 ͑Ref. The application of an external magnetic field B leads to novel properties [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] that are consequences of strong spin-orbit coupling, including colossal magnetoresistance [4][5][6] ͑CMR͒ that is attained by avoiding a ferromagnetic ͑FM͒ state. 3͒ are excellent examples.…”

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confidence: 99%

Ca 3 ( Ru 1 − x Cr x ) 2 O 7 : A new paradigm for spin valves

Cao

Korneta

Saito

et al. 2010

Journal of Applied Physics

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Low resistance spin-valve-type current-perpendicular-to-plane giant magnetoresistance with Co 75 Fe 25 A spin valve is a device structure whose electrical resistance can be manipulated by controlling the relative spin alignment of adjacent metallic, magnetic layers separated by nonmagnetic insulating layers. The spin valve effect is thought to be a delicate quantum phenomenon that depends upon the precision deposition and nanoscale patterning of artificial thin-film heterostructures whose quality and performance are difficult to control. We have observed a novel, strong spin valve effect in bulk single crystals of Ca 3 ͑Ru 1−x Cr x ͒ 2 O 7 having an anisotropic, bilayered crystal structure. This discovery opens new avenues for understanding the underlying physics of the spin valve effect, and for realizing their potential in practical devices.

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confidence: 99%

Ca 3 ( Ru 1 − x Cr x ) 2 O 7 : A new paradigm for spin valves

Cao

Korneta

Saito

et al. 2010

Journal of Applied Physics

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“…12 In Fig. 7(b), we also observed non-linear relations in the R s /ρ−ρ plots of the SRCO films in the ferromagnetic region, although the magnitude of deviation from the fitting curve (green dashed line)…”

Section: Resultsmentioning

confidence: 67%

Effects of Cr substitution on the magnetic and transport properties and electronic states ofSrRuO3epitaxial thin films

et al. 2015

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The effect of Cr substitution in a SrRuO 3 epitaxial thin film on SrTiO 3 substrate was investigated by measuring the magnetic and transport properties and the electronic states. The ferromagnetic transition temperature of the SrRu 0.9 Cr 0.1 O 3 film (166 K) was higher than that of the SrRuO 3 film (147 K). Resonant photoemission spectroscopy experimentally revealed that the Cr 3dt 2g orbital is hybridized with the Ru 4dt 2g orbital in the SrRu 0.9 Cr 0.1 O 3 film, supporting the assumption that the enhancement of the ferromagnetic transition temperature through Cr substitution stems from the widening of energy bands due to the hybridization of Cr 3dt 2g and Ru 4dt 2g orbitals.Furthermore, we found that the Hall resistivity of the SrRu 0.9 Cr 0.1 O 3 film at low temperature is not a linear function of magnetic field in the high-field region where the out-of-plane magnetization was saturated; this result suggests that the SrRu 0.9 Cr 0.1 O 3 film undergoes a structural transition at low temperature accompanied with the modulation of the Fermi surface.

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“…Doping of 10% of cations containing e g electrons, such as Mn 3+ , Co 2+ , Ni 2+ , Cu 2+ , and Zn 2+ , into SrRuO 3 decreased the T C to 105 K [6,7], due to the narrowing of the Ru 4dt 2g band induced by the local distortion of RuO 6 octahedra associated with the doping of ions larger than Ru 4+ and the destructive interaction between the Ru t 2g bands via the e g electrons of the doped cations [6]. In contrast, substitution of 10% Cr 3+ , which contains only t 2g electrons, increased the T C to 188 K [6,[8][9][10][11], owing to the widening of the energy bands due to the hybridization of Cr 3dt 2g and Ru 4dt 2g orbitals [12].…”

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confidence: 99%

Spectroscopic and theoretical investigation of the electronic states of layered perovskite oxyfluoride Sr2RuO3F2 thin films

et al. 2018

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We investigated the electronic structure of a layered perovskite oxyfluoride Sr 2 RuO 3 F 2 thin film by hard X-ray photoemission spectroscopy (HAXPES) and soft X-ray absorption spectroscopy (XAS) as well as density functional theory (DFT)-based calculations. The core-level HAXPES spectra suggested that Sr 2 RuO 3 F 2 is a Mott insulator. The DFT calculations described the total and site-projected density of states and the band dispersion for the optimized crystal structure of Sr 2 RuO 3 F 2 , predicting that Ru 4+ takes a high-spin configuration of (xy) ↑ (yz, zx) ↑↑ (3z 2-r 2) ↑ and that Sr 2 RuO 3 F 2 has an indirect band gap of 0.7 eV with minima at the M,A and X,R points. HAXPES spectra near the Fermi level and the angular-dependent O 1s XAS spectra of the Sr 2 RuO 3 F 2 thin film, corresponding to the valence band and conduction band density of states, respectively, were drastically different compared to those of the Sr 2 RuO 4 film, suggesting that the changes in the electronic states were mainly driven by the substitution of an oxygen atom coordinated to Ru by fluorine and subsequent modification of crystal field.

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Highly anisotropic magnetism in Cr-doped perovskite ruthenates

Cited by 39 publications

References 40 publications

Ca 3 ( Ru 1 − x Cr x ) 2 O 7 : A new paradigm for spin valves

Ca 3 ( Ru 1 − x Cr x ) 2 O 7 : A new paradigm for spin valves

Effects of Cr substitution on the magnetic and transport properties and electronic states ofSrRuO3epitaxial thin films

Spectroscopic and theoretical investigation of the electronic states of layered perovskite oxyfluoride Sr2RuO3F2 thin films

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