Direct observation of the induced moment on nonmagnetic Ru: A magnetic Compton study of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Ca</mml:mi><mml:msub><mml:mi mathvariant="normal">Ru</mml:mi><mml:mn>0.85</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Fe</mml:mi><mml:mn>0.15</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>

Mizusaki, S.; Taniguchi, Takashi; Okada, Noriko; Nagata, Y.; Hiraoka, N.; Nagao, T.; Itou, M.; Sakurai, Y.; Ozawa, Tadashi C.; Noro, Y.

doi:10.1103/physrevb.74.052401

Cited by 29 publications

(39 citation statements)

References 23 publications

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“…The magnetism of Fe-pnictide superconductors, and, more generally, of a frustrated square lattice has also been approached using itinerant magnetic models. [29][30][31] Interestingly, the calculated magnetic phase diagrams agree with those determined using the J 1 -J 2 localmoment Heisenberg model, albeit within certain limits. This dual character of the magnetism has been explored in other Fe-pnictide materials.…”

Section: Introductionmentioning

confidence: 54%

Competing magnetic phases and itinerant magnetic frustration in SrCo2As2

Ueland

Jayasekara

et al. 2019

Phys. Rev. B

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Whereas magnetic frustration is typically associated with local-moment magnets in special geometric arrangements, here we show that SrCo2As2 is a candidate for frustrated itinerant magnetism. Using inelastic neutron scattering (INS), we find that antiferromagnetic (AF) spin fluctuations develop in the square Co layers of SrCo2As2 below T ≈ 100 K centered at the stripe-type AF propagation vector of ( 1 2 , 1 2 ), and that their development is concomitant with a suppression of the uniform magnetic susceptibility determined via magnetization measurements. We interpret this switch in spectral weight as signaling a temperature-induced crossover from an instability towards FM ordering to an instability towards stripe-type AF ordering on cooling, and show results from Monte-Carlo simulations for a J1-J2 Heisenberg model that illustrate how the crossover develops as a function of the frustration ratio −J1/(2J2). By putting our INS data on an absolute scale, we quantitatively compare them and our magnetization data to exact-diagonalization calculations for the J1-J2 model [N. Shannon et al., Eur. Phys. J. B 38, 599 (2004)], and show that the calculations predict a lower level of magnetic frustration than indicated by experiment. We trace this discrepancy to the large energy scale of the fluctuations (Javg 75 meV), which, in addition to the steep dispersion, is more characteristic of itinerant magnetism. arXiv:1907.08718v1 [cond-mat.str-el]

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Section: Introductionmentioning

confidence: 54%

Competing magnetic phases and itinerant magnetic frustration in SrCo2As2

Ueland

Jayasekara

et al. 2019

Phys. Rev. B

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“…It is well known that in the CaRu 1−x Fe x O 3 system ferromagnetism appears for a very small Fe doping ͑x Ӷ 0.1͒ and the magnetic moment has a maximum at x = 0.15. Our magnetic Compton scattering experiment revealed that the ratio of the Fe spin moment to the Ru spin moment is 0.5 for a specimen of x = 0.15, 16 indicating that Ru makes a dominant contribution to the magnetization of CaRu 1−x Fe x O 3 . The magnetism of CaRu 1−x Fe x O 3 was explained by the FeRu 6 cluster model, in which a Fe ion induces a magnetic moment on the six nearest-neighbor Ru ions and the Fe ion couples with six surrounding Ru ions antiferromagnetically.…”

Section: Magnetization Measurementsmentioning

confidence: 97%

Crystallographic and magnetic properties of the mixed-valence oxidesCaRu1−xMnxO3

et al. 2008

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The crystallographic and magnetic properties of CaRu 1−x Mn x O 3 ͑0 Յ x Յ 1.0͒ were investigated in detail by x-ray powder diffraction, magnetization, and magnetic Compton scattering measurements. The lattice parameters show considerable deviation from Vegard's law. Ferromagnetism appears at a relatively large Mn concentration ͑x Ն 0.2͒, and the magnetization and the Curie temperature have a maximum at a Mn content near x = 0.7. The magnetic Compton scattering measurement revealed that Mn makes a dominant contribution to the magnetization and the Mn moment is antiparallel to the Ru moment, which is induced by Mn doping. The anomalous change in the unit cell volume and the occurrence of ferromagnetism were discussed on the basis of the mixed-valence model of Mn 3+ , Mn 4+ , Ru 4+ , and Ru 5+ ions. The Mn-composition dependence of the spontaneous magnetization was explained semiquantitatively assuming ͑1͒ ferromagnetic coupling between Mn 3+ and Mn 4+ ions, ͑2͒ antiferromagnetic coupling between Ru 5+ and Mn ions, and ͑3͒ the theoretical spin moments of Mn 3+ , Mn 4+ , and Ru 5+ . The ferromagnetic interaction between Mn 3+ and Mn 4+ ions seems to make a dominant contribution to the Curie temperature. The CaRu 1−x Mn x O 3 system is considered to be a ferrimagnet induced through competition between the ferromagnetic interaction between Mn ions and the antiferromagnetic interaction between Ru 5+ and Mn ions.

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“…In the study of bulk CaRu 1Àx Fe x O 3 system, it was suggested that Fe ion exists as Fe 3+ ion for small substitution levels [8][9][10][11]. Therefore, Ti is also expected to exist as Ti 3+ ion in the CRTO film system for small substitution levels and the Ti 3+ induces Ru 5+ ion to maintain charge neutrality.…”

Section: Resultsmentioning

confidence: 97%

“…CaRuO 3 is known to be an itinerant paramagnet that is on the verge of magnetic ordering [5]. Therefore, CaRuO 3 readily forms magnetic order when other metal ions are doped into Ru site [6][7][8][9][10][11][12][13][14][15][16]. However, the mechanism of the occurrence of ferromagnetism has not been understood well.…”

Section: Introductionmentioning

confidence: 98%