Some Neutron-Diffraction Investigations at the Nuclear Center of Grenoble

Bertaut, E.F.; Bassi, G.; Buisson, G.; Burlet, P.; Chappert, J.; Delapalme, A.; Mareschal, Julie; Roult, G.; Aléonard, R.; Pauthenet, R.; Rebouillat, J.P.

doi:10.1063/1.1708325

Cited by 109 publications

(64 citation statements)

References 7 publications

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“…A magnetic refinement was performed with G-type spin structure. As shown in Figure 2 [18] and BiCrO 3 (2.55 m B ). [19] Conversely, this fact supports the refined composition of SrCr 3+ O 2 H. With increasing temperature, the magnetic peak decreases gradually and finally vanishes at around T N % 380 K (Figure 3).…”

Section: Angewandte Communications Cations (Versus La 3+mentioning

confidence: 93%

Direct Synthesis of Chromium Perovskite Oxyhydride with a High Magnetic‐Transition Temperature

et al. 2014

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We report a novel oxyhydride SrCrO2H directly synthesized by a high-pressure high-temperature method. Powder neutron and synchrotron X-ray diffraction revealed that this compound adopts the ideal cubic perovskite structure (Pm3̄m) with O(2-)/H(-) disorder. Surprisingly, despite the non-bonding nature between Cr 3d t(2g) orbitals and the H 1s orbital, it exhibits G-type spin ordering at T(N)≈380 K, which is higher than that of RCrO3 (R=rare earth) and any chromium oxides. The enhanced T(N) in SrCrO2H with four Cr-O-Cr bonds in comparison with RCr(3+)O3 with six Cr-O-Cr bonds is reasonably explained by the tolerance factor. The present result offers an effective strategy to tune octahedral tilting in perovskites and to improve physical and chemical properties through mixed anion chemistry.

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Section: Angewandte Communications Cations (Versus La 3+mentioning

confidence: 93%

Direct Synthesis of Chromium Perovskite Oxyhydride with a High Magnetic‐Transition Temperature

et al. 2014

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“…On the other hand, neutron diffraction studies have failed to resolve the second magnetic transition as well as the spin configuration of the PrPr exchange interactions at lower temperatures. E. F. Bertaut et al [58] observed spin ordering with a weak ferroelectric component, F x , above 4.2 K without referring to a Pr magnetic ordering. Afterwards, N. Shamir et al [46] identified a weak magnetic structure (C y F x magnetic structure) by neutron scattering studies at 9 K for the PrCrO 3 compound.…”

Section: Discussionmentioning

confidence: 99%

Reversal magnetization, spin reorientation, and exchange bias in YCrO3 doped with praseodymium

Durán

Escamilla

Escudero

et al. 2018

Phys. Rev. Materials

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Crystal structure, thermal and magnetic properties were systematically studied in the Y1-x Prx CrO3 with 0 ≤ x ≤ 0.3 compositions. Magnetic susceptibility and specific heat measurements show an increase of the antiferromagnetic transition temperature (TN ) as Pr is substituted in the Y sites and notable magnetic features are observed below TN . Strong coupling between magnetic and crystalline parameters is observed in a small range of Pr compositions. A small perturbation in the lattice parameters by Pr ion is sufficient to induce a spin reorientation transition followed by magnetization reversal, to finally induce exchange bias effect. The spin reorientation temperature (TSR) is increased from 35 K to 149 K for 0.025 ≤ x ≤ 0.1 compositions. It is found that the Cr spins sublattice rotates continuously from TSR to a new spin configuration a lower temperature. In addition, magnetization reversal is observed at T * ∼ 35 K for x= 0.05 up to T * ∼ 63 K for x = 0.20 composition. The M − H curves show negative exchange bias effect induced by Pr ions, which are observed below of 100 K and being more intense at 5 K. At 10 K, the magnetic contribution of the specific heat, as well as the ZFC magnetization, show the rise of a peak with increasing Pr content. The magnetic anomaly could be associated with the freezing of the Pr magnetic moment randomly distributed at the 4c crystallographic site. A clear correspondence between spin reorientation, magnetization reversal and exchange bias anisotropy with the tilting and octahedral distortion is also discussed.

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“…The small increasing found in the susceptibility below 10 K are due to presence of a small amount of TbCrO 3 , around 8%, also detected from X-ray diffraction and included in the Rietveld refinement as it can be observed in Fig. 1 [14].…”

Section: Magnetic Propertiesmentioning

confidence: 68%

Phase transition induced by pressure in TbCrO4 oxide: Relationship structure–properties

Climent‐Pascual

Gallardo

Paz

et al. 2009

Journal of Alloys and Compounds

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Some Neutron-Diffraction Investigations at the Nuclear Center of Grenoble

Cited by 109 publications

References 7 publications

Direct Synthesis of Chromium Perovskite Oxyhydride with a High Magnetic‐Transition Temperature

Direct Synthesis of Chromium Perovskite Oxyhydride with a High Magnetic‐Transition Temperature

Reversal magnetization, spin reorientation, and exchange bias in YCrO3 doped with praseodymium

Phase transition induced by pressure in TbCrO4 oxide: Relationship structure–properties

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