Structure and Magnetism in CrTa2O6: A Trirutile Oxide Based on Cr2+

Saes, M.; Raju, N. P.; Greedan, John E.

doi:10.1006/jssc.1998.7674

Cited by 28 publications

(21 citation statements)

References 9 publications

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“…It is worth mentioning that the Fe=Co-O planes were described by the same model for all concentrations, with the uniaxial anisotropy strength D varying from a highest value for pure Co to a lowest value for pure Fe, but always large enough to guarantee that the spins lay along the easy axis in each plane. Besides, the best-fitting ratio J 2 =J 1 never departed much from unity, in contrast to other calculations [13,17,18], and J 1 ' J 2 for x ' 0:4.…”

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confidence: 85%

Bicriticality inFexCo1−xT

et al. 2003

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X-ray and neutron-diffraction, dc magnetic susceptibility, magnetization, and specific-heat measurements are reported for FexCo(1-x)Ta2O6 mixed oxides. X-ray refinement indicates homogeneous samples for all the reported concentrations. The neutron-diffraction measurements reveal magnetic structures with double propagation vectors (+/-1/4,1/4,1/4) for CoTa2O6, and (1/2,0,1/2) and (0,1/2,1/2) for FeTa2O6. The latter remain unchanged in the Fe-rich samples, for 0.46< or =x<1.00, while the Co-rich samples show propagation vectors (+/-1/4,1/4,0) for 0.09< or =x<0.46. The temperature vs x phase diagram exhibits a bicritical point at about T=4.9 K and x=0.46. For this concentration, and at low temperatures, the system shows coexistence of both magnetic structures. This novel bicritical behavior is interpreted as induced by competition between the different magnetic and crystallographic structures.

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confidence: 85%

Bicriticality inFexCo1−xT

et al. 2003

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“…The magnetic ordering at the Curie temperature T C = 29 K is confirmed by a λ-type peak in specific heat. Dominant horizontal line denotes value of saturation magnetization M sat for g -factor g = 1.98 μ B [19].…”

Section: Discussionmentioning

confidence: 99%

Weak ferrimagnetism and multiple magnetization reversal inα-Cr3(PO4)
Vasiliev
¹
,
Волкова
²
,
Hammer
³

et al. 2012
Phys. Rev. B

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The chromium(II) orthophosphate α-Cr 3 (PO 4 ) 2 is a weak ferrimagnet with the Curie temperature T C = 29 K confirmed by a λ-type peak in specific heat. Dominant antiferromagnetic interactions in this system are characterized by the Weiss temperature = 96 K, indicating an intermediate frustration ratio | |/T C ∼ 3. In its magnetically ordered states α-Cr 3 (PO 4 ) 2 exhibits a remarkable sequence of temperature-induced magnetization reversals sensitive to the protocol of measurements, i.e., either field-cooled or zero-field-cooled regimes. The reduction of the effective magnetic moment 4.5 μ B /Cr 2+ , as compared to the spin-only moment 4.9 μ B /Cr 2+ , cannot be ascribed to the occurrence of the low-spin state in any crystallographic site of the Jahn-Teller active 3d 4 Cr 2+ ions. X-ray absorption spectra at the K edge indicate divalent chromium and unravel the high-spin state of these ions at the L 2,3 edges. Weak ferrimagnetism and multiple magnetization reversal phenomena seen in this compound could be ascribed to incomplete cancellation and distortion of partial spontaneous magnetization functions of Cr 2+ in its six crystallographically inequivalent positions.

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“…where AO1(2) is the distance between Ni/Co atoms and the O1(2) oxygen and AOi is the mean semi-diagonal [14]. This positive value reflects that the Ni/Co octahedral are elongated along one direction corresponding to the O2.…”

Section: Crystal Structurementioning

confidence: 96%

Study of the quasi two-dimensional CoxNi1-xTa2O6 compounds by X-ray diffraction and magnetic susceptibility measurements

Neto¹,

Kinast²,

Gusmao³

et al. 2012

Journal of Magnetism and Magnetic Materials

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International audienceWe report results on the structural and magnetic properties of the CoxNi1-xTa2O6 series of compounds by X-ray powder diffraction, magnetic susceptibility and magnetization measurements. X-ray refinements carried out by the Rietveld method show that these compounds crystallize in a P42/mnm tetragonal structure. Magnetic susceptibility curves show a broadened maximum witnessing that these compounds exhibit two-dimensional antiferromagnetic behaviors. All the CoxNi1-xTa2O6 compounds order below 10 K and present a large ion anisotropy. The magnetic properties have been determined in both the paramagnetic and antiferromagnetic state. In the hypothesis of two dimensional AF ordering, the near neighbor exchange constants (J1) and the next near neighbor exchange constants for two different paths (J2 and J'2) were determined. The composition dependence of the magnetic properties including ordering temperature, exchange constants and anisotropy factors are discussed. The drastic reduction of the ordering temperature for x=0.20 for CoxNi1-xTa2O6, suggest the hypothesis of a peculiar magnetic behavior for this composition

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Structure and Magnetism in CrTa2O6: A Trirutile Oxide Based on Cr2+

Cited by 28 publications

References 9 publications

Bicriticality inFexCo1−xT

Bicriticality inFexCo1−xT

Weak ferrimagnetism and multiple magnetization reversal inα-Cr3(PO4)
Vasiliev
¹
,
Волкова
²
,
Hammer
³

et al. 2012
Phys. Rev. B

Study of the quasi two-dimensional CoxNi1-xTa2O6 compounds by X-ray diffraction and magnetic susceptibility measurements

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Structure and Magnetism in CrTa2O6: A Trirutile Oxide Based on Cr2+

Cited by 28 publications

References 9 publications

Bicriticality inFexCo1−xT

Bicriticality inFexCo1−xT

Weak ferrimagnetism and multiple magnetization reversal inα-Cr3(PO4)Vasiliev1, Волкова2, Hammer3 et al. 2012Phys. Rev. B

Study of the quasi two-dimensional CoxNi1-xTa2O6 compounds by X-ray diffraction and magnetic susceptibility measurements

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Weak ferrimagnetism and multiple magnetization reversal inα-Cr3(PO4)
Vasiliev
¹
,
Волкова
²
,
Hammer
³

et al. 2012
Phys. Rev. B