Pressure dependence of the magnetic transition temperature for ferromagnetic SrRuO3

Shikano, Masahiro; Huang, Taohong; Inaguma, Yoshiyuki; Itoh, Makoto; Nakamura, Tetsurō

doi:10.1016/0038-1098(94)90942-3

Cited by 90 publications

(40 citation statements)

References 11 publications

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“…The electrical resistivity of SrRuO 3 exhibits a metallic behavior over the entire temperature range and shows a kink at the FM transition temperature of 161 K. These features are in agreement with previous measurements performed on polycrystalline samples. 41,42) The kink anomally at T * in ρ becomes very small for x = 0.1 (the inset of Fig. 5(a)) and then disappears upon further doping La.…”

Section: Resultsmentioning

confidence: 99%

Ferromagnetic Cluster-Glass State in Itinerant Electron System Sr₁₋_xLa_xRuO₃

et al. 2014

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The magnetic and electronic properties of Sr 1−x La x RuO 3 were studied by means of dc-magnetization, acsusceptibility, specific heat, and electrical resistivity measurements. The dc-magnetization and ac-susceptibility measurements have revealed that the transition temperature and the ordered moment of the ferromagnetic order are strongly suppressed as La is substituted for Sr. The ac-susceptibility exhibits a peak at T * due to the occurrence of spontaneous spin polarization. Furthermore, we observed that T * shows clear frequency variations for x ≥ 0.3. The magnitude of the frequency shifts of T * is comparable to that of cluster-glass systems, and the frequency dependence is well described in terms of the Vogel-Fulcher law. On the other hand, it is found that the linear specific heat coefficient γ enhances with the suppression of the ferromagnetic order. The relatively large γ values reflect the presence of the Ru 4d state at Fermi level, and hence, the magnetism of this system is considered to be tightly coupled with the itinerant characteristics of the Ru 4d electrons. The present experimental results and analyses suggest that the intrinsic coexistence of the spatially inhomogeneous magnetic state and the itinerant nature of the Ru 4d electrons is realized in this system, and such a feature may be commonly involved in La-and Ca-doped SrRuO 3 .

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Section: Resultsmentioning

confidence: 99%

Ferromagnetic Cluster-Glass State in Itinerant Electron System Sr₁₋_xLa_xRuO₃

et al. 2014

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“…Polycrystalline samples were reported in refs. [3,14,26], single crystals in ref. [25], and oriented thin film samples in refs.…”

Section: Transport Propertiesmentioning

confidence: 99%

Transport properties, thermodynamic properties, and electronic structure ofSrRuO3

et al. 1996

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(today) SrRuO3 is a metallic ferromagnet. Its electrical resistivity is reported for temperatures up to 1000K; its Hall coefficient for temperatures up to 300K; its specific heat for temperatures up to 230K. The energy bands have been calculated by self-consistent spin-density functional theory, which finds a ferromagnetic ordered moment of 1.45µB per Ru atom. The measured linear specific heat coefficient γ is 30mJ/mole, which exceeds the theoretical value by a factor of 3.7. A transport mean free path at room temperature of ≈ 10Å is found. The resistivity increases nearly linearly with temperature to 1000K in spite of such a short mean free path that resistivity saturation would be expected. The Hall coefficient is small and positive above the Curie temperature, and exhibits both a low-field and a high-field anomalous behavior below the Curie temperature.65.40. Em,75.40.Cx,71.25.Pi,72.15.Eb,72.15.Gd

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“…CaRuO 3 remains paramagnetic to the lowest temperature (7,8), but it is near the verge of ferromagnetic order (9,10). However, SrRuO 3 is an itinerant-electron ferromagnet with a T c Ϸ 164 K (11)(12)(13)(14)(15)(16). As a representation of currently popular models about the ferromagnetism in SrRuO 3 , Mazin and Singh (17) have calculated the band structure of Sr 1Ϫx Ca x RuO 3 by taking into account the cooperative RuO 6 site rotation that bends the Ru-O-Ru bond angle from 163°in SrRuO 3 to148°in CaRuO 3 ; they found that the increased bending of the Ru-O-Ru bond angle reduces the band degeneracy and, therefore, the density of electronic states at the Fermi energy ( F ), perhaps to where the Stoner criterion ( F )U Ϸ 1, where ( F ) is the electron at the Fermi energy and U is the electron correlation energy, is no longer valid in CaRuO 3 .…”

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High-pressure synthesis of the cubic perovskite BaRuO ₃ and evolution of ferromagnetism in ARuO ₃ (A = Ca, Sr, Ba) ruthenates

Chen

Zhou²,

Goodenough³

et al. 2008

Proc. Natl. Acad. Sci. U.S.A.

188

160

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The cubic perovskite BaRuO3 has been synthesized under 18 GPa at 1,000°C. Rietveld refinement indicates that the new compound has a stretched Ru-O bond. The cubic perovskite BaRuO3 remains metallic to 4 K and exhibits a ferromagnetic transition at Tc ‫؍‬ 60 K, which is significantly lower than the Tc Ϸ 160 K for SrRuO3. The availability of cubic perovskite BaRuO3 not only makes it possible to map out the evolution of magnetism in the whole series of ARuO3 (A ‫؍‬ Ca, Sr, Ba) as a function of the ionic size of the A-site rA, but also completes the polytypes of BaRuO3. Extension of the plot of Tc versus rA in perovskites ARuO3 (A ‫؍‬ Ca, Sr, Ba) shows that Tc does not increase as the cubic structure is approached, but has a maximum for orthorhombic SrRuO3. Suppressing Tc by Ca and Ba doping in SrRuO3 is distinguished by sharply different magnetic susceptibilities (T) of the paramagnetic phase. This distinction has been interpreted in the context of a Griffiths' phase on the (Ca Sr)RuO3 side and bandwidth broadening on the (Sr,Ba)RuO3 side.magnetism ͉ compounds ͉ Ruthenate

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Pressure dependence of the magnetic transition temperature for ferromagnetic SrRuO3

Cited by 90 publications

References 11 publications

Ferromagnetic Cluster-Glass State in Itinerant Electron System Sr₁₋_xLa_xRuO₃

Ferromagnetic Cluster-Glass State in Itinerant Electron System Sr₁₋_xLa_xRuO₃

Transport properties, thermodynamic properties, and electronic structure ofSrRuO3

High-pressure synthesis of the cubic perovskite BaRuO ₃ and evolution of ferromagnetism in ARuO ₃ (A = Ca, Sr, Ba) ruthenates

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Pressure dependence of the magnetic transition temperature for ferromagnetic SrRuO3

Cited by 90 publications

References 11 publications

Ferromagnetic Cluster-Glass State in Itinerant Electron System Sr1−xLaxRuO3

Ferromagnetic Cluster-Glass State in Itinerant Electron System Sr1−xLaxRuO3

Transport properties, thermodynamic properties, and electronic structure ofSrRuO3

High-pressure synthesis of the cubic perovskite BaRuO 3 and evolution of ferromagnetism in ARuO 3 (A = Ca, Sr, Ba) ruthenates

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Ferromagnetic Cluster-Glass State in Itinerant Electron System Sr₁₋_xLa_xRuO₃

Ferromagnetic Cluster-Glass State in Itinerant Electron System Sr₁₋_xLa_xRuO₃

High-pressure synthesis of the cubic perovskite BaRuO ₃ and evolution of ferromagnetism in ARuO ₃ (A = Ca, Sr, Ba) ruthenates