An Investigation of the Magnetic Properties of Sm1−xTiO3forx=0.03, 0.05, and 0.10: Magnetic Structure Determination of Sm0.97TiO3by Short-Wavelength Neutron Diffraction on Single Crystals

Amow, G.; Greedan, John E.; Ritter, C.

doi:10.1006/jssc.1998.7989

Cited by 27 publications

(15 citation statements)

References 13 publications

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“…Figure 5 shows a divergence in the measuring "eld of 20 Oe between the curves taken after ZFC and FC. A similar behavior was found for the antiferromagnetic compounds NdTiO and SmTiO , both of which exhibit a weak, canted-spin ferromagnetism (8,11). However, at higher "elds the divergence of Fig.…”

Section: Figsupporting

confidence: 73%

Peculiar Magnetism of the Sm(1−x)GdxTiO3 System

Amow¹,

Zhou²,

Goodenough³

2000

Journal of Solid State Chemistry

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Section: Figsupporting

confidence: 73%

Peculiar Magnetism of the Sm(1−x)GdxTiO3 System

Amow¹,

Zhou²,

Goodenough³

2000

Journal of Solid State Chemistry

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“…For the lighter RE ions (RE = Ce, ... , Sm) the RE moments order antiferromagnetically below T N 2 < T N 1 (with T N 1 being the Néel temperature for G x -type antiferromagnetic ordering at the Ti sites). For the RETiO 3 compounds studied in this work belonging to this first group (RE = Nd, Sm) an antiferromagnetic ordering of F y /C ztype is observed at the RE sites 6,7 . For the RETiO 3 with heavier RE ions (RE = Gd,...,Yb) there are two basic magnetic structures.…”

Section: Introductionmentioning

confidence: 77%

“…Concomitantly, the Ti magnetic order changes from G-type antiferromagnetism with the magnetic moment in a direction (RE = La,...,Sm) to ferromagnetism with the magnetic moment in c direction (RE=Gd,...,Yb and Y) 5,6,7,8,9,10,11,12,13,14,15,16 . These apparently distinct magnetic ordering schemes, however, belong to the same irreducible representation, as it has been clarified long ago 17 for the structure type of GdFeO 3 to which all RETiO 3 belong.…”

Section: Introductionmentioning

confidence: 99%

Magnetoelastic coupling inRTiO3(R=La,Nd
Komarek
¹
,
Roth
²
,
Cwik
³

et al. 2007
Phys. Rev. B
128
11
154
0
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A detailed analysis of the crystal structure in RETiO3 with RE = La, Nd, Sm, Gd, and Y reveals an intrinsic coupling between orbital degrees of freedom and the lattice which cannot be fully attributed to the structural deformation arising from bond-length mismatch. The TiO6 octahedra in this series are all irregular with the shape of the distortion depending on the RE ionic radius. These octahedron distortions vary more strongly with temperature than the tilt and rotation angles. Around the Ti magnetic ordering all compounds exhibit strong anomalies in the thermal-expansion coefficients, these anomalies exhibit opposite signs for the antiferromagnetic and ferromagnetic compounds. Furthermore the strongest effects are observed in the materials close to the magnetic cross-over from antiferromagnetic to ferromagnetic order.

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“…Most interestingly, the cross-over between the two types of structural deformation [17] coincides with the crossover from antiferromagnetic to ferromagnetic ordering [18,19,20] in the RETiO 3 -compounds. With decreasing RE ionic radius NdTiO 3 and SmTiO 3 exhibit still antiferromagnetic order with small T N [19,20], whereas GdTiO 3 is ferromagnetically ordered. A similar magnetic crossover is seen in the La 1−x Y x TiO 3 -series [21].…”

Section: Figmentioning

confidence: 99%

Crystal and magnetic structure ofLaTiO3:Evidence for nondegeneratet2g
Cwik
¹
,
Lorenz
²
,
Baier
³

et al. 2003
Phys. Rev. B
206
32
222
1
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The crystal and magnetic structure of LaTiO3 has been studied by x-ray and neutron diffraction techniques using nearly stoichiometric samples. We find a strong structural anomaly near the antiferromagnetic ordering, TN =146 K. In addition, the octahedra in LaTiO3 exhibit an intrinsic distortion which implies a splitting of the t2g-levels. Our results indicate that LaTiO3 should be considered as a Jahn-Teller system where the structural distortion and the resulting level splitting are enhanced by the magnetic ordering.LaTiO 3 has been studied already in the seventies and was thought to be a text book example of a Mottinsulator with antiferromagnetic order [1]. Ti is in its three-valent state with a single electron in the t 2g -orbitals of the 3d-shell. The titanate is hence an electron analog to the cuprates with a single hole in the 3d-shell. However, the t 2g -orbitals in the LaTiO 3 are less Jahn-Teller active and, therefore, the orbital moment may not be fully quenched in the titanate. The physics of the orbital degree of freedom has recently reattracted attention to this material [2,3].The ordered moment in LaTiO 3 amounts to 0.46 µ B which is much smaller than the value of 1µ B expected for a single electron with quenched orbital moment [4]. Quantum fluctuations can explain only about 15% reduction in the 3D-case. A straight-forward explanation could be given in terms of spin-orbit coupling, as an unquenched orbital moment would align antiparallel to the spin-moment in the titanate. However, in a recent neutron scattering experiment the magnon spin gap was observed at 3.3 meV, and it was argued that the strong interaction of an orbital moment with the crystal lattice implies a much larger value for the spin gap [2]. An orbital contribution to the ordered moment in LaTiO 3 was hence excluded. On the basis of standard theories, however, even the G-type antiferromagnetic ordering in LaTiO 3 may not be explained without a spinorbit coupling. Instead one expects ferromagnetism [5,6] related with the orbital degeneracy. Under the assumption of a specific structural distortion, Moshizuki and Imada recently presented a successful model for the antiferromagnetic order in LaTiO 3 [7]. However, there is no experimental evidence for such a distortion. The puzzling magnetic properties of LaTiO 3 led Khaliullin and Maekawa to suggest a novel theoretical description for RETiO 3 based on the idea of an orbital liquid. They were able to explain many of the magnetic characteristics of LaTiO 3 [3], but the presumed orbital fluctuations have not been observed [8]. Therefore, magnetism in LaTiO 3 still remains an open issue.We have reanalyzed the crystal and magnetic structure of LaTiO 3 by x-ray and by neutron diffraction samples with almost perfect stoichiometry. First, we find a clear structural anomaly at the Néel-ordering and, second, the shape of the octahedra in this compound is not ideal but distorted. From these observations we conclude that LaTiO 3 has to be considered as a soft Jahn-Teller system thereby explaining m...

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An Investigation of the Magnetic Properties of Sm1−xTiO3forx=0.03, 0.05, and 0.10: Magnetic Structure Determination of Sm0.97TiO3by Short-Wavelength Neutron Diffraction on Single Crystals

Cited by 27 publications

References 13 publications

Peculiar Magnetism of the Sm(1−x)GdxTiO3 System

Peculiar Magnetism of the Sm(1−x)GdxTiO3 System

Magnetoelastic coupling inRTiO3(R=La,Nd
Komarek
¹
,
Roth
²
,
Cwik
³

et al. 2007
Phys. Rev. B
128
11
154
0
View full text Add to dashboard Cite

Crystal and magnetic structure ofLaTiO3:Evidence for nondegeneratet2g
Cwik
¹
,
Lorenz
²
,
Baier
³

et al. 2003
Phys. Rev. B
206
32
222
1
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An Investigation of the Magnetic Properties of Sm1−xTiO3forx=0.03, 0.05, and 0.10: Magnetic Structure Determination of Sm0.97TiO3by Short-Wavelength Neutron Diffraction on Single Crystals

Cited by 27 publications

References 13 publications

Peculiar Magnetism of the Sm(1−x)GdxTiO3 System

Peculiar Magnetism of the Sm(1−x)GdxTiO3 System

Magnetoelastic coupling inRTiO3(R=La,NdKomarek1, Roth2, Cwik3 et al. 2007Phys. Rev. B128111540View full textAdd to dashboardCite

Crystal and magnetic structure ofLaTiO3:Evidence for nondegeneratet2gCwik1, Lorenz2, Baier3 et al. 2003Phys. Rev. B206322221View full textAdd to dashboardCite

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Magnetoelastic coupling inRTiO3(R=La,Nd
Komarek
¹
,
Roth
²
,
Cwik
³

et al. 2007
Phys. Rev. B
128
11
154
0
View full text Add to dashboard Cite

Crystal and magnetic structure ofLaTiO3:Evidence for nondegeneratet2g
Cwik
¹
,
Lorenz
²
,
Baier
³

et al. 2003
Phys. Rev. B
206
32
222
1
View full text Add to dashboard Cite