<i>Review</i>/<i>Synthèse</i>: Triangular antiferromagnets

Collins, M. F.; Petrenko, O. A.

doi:10.1139/p97-007

Cited by 477 publications

(473 citation statements)

References 240 publications

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“…Their magnetization curves demonstrate only one spin-flop transition at a critical field H c for a field applied along the hexagonal axis and the absence of any transitions for the field applied perpendicular to this axis. In addition, in ABX 3 -type systems, the application of a magnetic field results in a decrease of the temperature difference between two phases transitions T N1 and T N2 [35], while for CuFeO 2 , the effect is the opposite; an applied magnetic field stabilizes an intermediate incommensurate structure. In antiferromagnetic oxide CuFe 1−x Sc x O 2 , The plot of 1/χ versus T (Fig.…”

Section: Magnetic Propertiesmentioning

confidence: 98%

Effect of Spin Dilution on the Magnetic State of Delafossite CuFeO2 with an S = 5/2 Antiferromagnetic Triangular Sublattice

Elkhoun

Amami

Hlil

et al. 2015

J Supercond Nov Magn

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This work describes the scandium doping effect on the structural and magnetic properties of delafossite-type oxides CuCr 1−x Sc x O 2 . The lattice parameters were found to vary according to Vegard's low. A reflection broadening is observed that is ascribed to local lattice distortion due to the ionic radius difference between Fe 3+ and Sc 3+ . Magnetic susceptibility measurements show that the dominant interactions are antiferromagnetic (AFM) but that doping induces significant changes. A rather monotonous T N2 decrease as x increases, from T N2 = 9.1 K down to T N2 = 5.9 K for x = 0.00 to 0.25, respectively, but T N1 remains almost unchanged. The Sc substitution (S = 0) at the Fe sites (S = 5/2) tend to suppress the low ferromagnetic interactions in the magnetic structure; however, the magnetic exchange coupling J BB decreases under 5.0 meV with increasing x. The electric polarization decreases with x up to 63 μC/m 2 for 5 %-Sc to 22 μC/m 2 for 25 %-Sc.

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Section: Magnetic Propertiesmentioning

confidence: 98%

Effect of Spin Dilution on the Magnetic State of Delafossite CuFeO2 with an S = 5/2 Antiferromagnetic Triangular Sublattice

Elkhoun

Amami

Hlil

et al. 2015

J Supercond Nov Magn

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“…Since some review articles with emphasis on experimental works are already available [42,44], I summarize here some of the main features and highlight the points of interest.…”

Section: (B) Helimagnetsmentioning

confidence: 99%

Untitled

Kawamura¹

1998

J. Phys.: Condens. Matter

341

470

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Recent theoretical and experimental studies on the critical properties of frustrated antiferromagnets with the noncollinear spin order, including stacked-triangular antiferromagnets and helimagnets, are reviewed. Particular emphasis is put on the novel critical and multicritical behaviors exhibited by these magnets, together with an important role played by the 'chirality'. §1. Introduction Phase transitions and critical phenomena have been a central issue of statistical physics for many years. In particular, phase transitions of magnets or of 'spin systems' have attracted special interest. Thanks to extensive theoretical and experimental studies, we now have rather good understanding of the nature of phase transitions of standard ferromagnets and antiferromagnets. By the term 'standard', I mean here regular and unfrustrated magnets without quenched disorder and frustration. They include ferromagnets and unfrustrated antiferromagnets with the collinear spin order.One key notion which emerged through these studies is the notion of universality. According to the universality hypothesis, a variety of continuous (or secondorder) phase transitions can be classified into a small number of universality classes determined by a few basic properties characterizing the system under study, such as the space dimensionality d, the symmetry of the order parameter and the range of interaction. If one is interested only in the so-called universal quantities, such as critical exponents, amplitude ratios and scaled equation of state, various phase transitions should exhibit exactly the same behavior. In the case of standard bulk magnets in three spatial dimensions (d = 3), universality class is basically determined by the number of the spin components, n. Physically, the index n is related to the type of magnetic anisotropy: Namely, n = 1 (Ising), n = 2 (XY ) and n = 3 (Heisenberg) correspond to magnets with easy-axis-type anisotropy, easy-plane-type anisotropy and no anisotropy (isotropic magnets), respectively. The critical properties associated with these n-component O(n) universality classes have been extensively studied and are now rather well understood. From the renormalization-group (RG) viewpoint, these critical properties are governed by the so-called Wilson-Fisher O(n) fixed point.

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“…12 The subtle difference of the critical exponents between these models (also presented in Table I) and the conventional models requires highresolution measurements in the vicinity of T N in order to discriminate them.…”

Section: Introductionmentioning

confidence: 99%

Critical behavior of the paramagnetic to antiferromagnetic transition in orthorhombic and hexagonal phases ofRMnO3(R=Sm
Oleaga
¹
,
Salazar
²
,
Prabhakaran
³

et al. 2012
Phys. Rev. B
57
6
49
0
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The critical behavior of the paramagnetic to antiferromagnetic transition in RMnO 3 (R = Sm, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y) has been studied with an ac photopyroelectric calorimeter, which gives simultaneously the thermal diffusivity and specific heat as a function of temperature with high resolution around the Néel temperature. RMnO 3 (R = Sm, Tb, Dy) has an orthorhombic perovskite structure, whereas the other manganites are hexagonal, thus revealing a strong thermal anisotropy. SmMnO 3 with an Type-A antiferromagnetic ordering exhibits a 3D-XY critical behavior, which could be attributed to the peculiar site anisotropy of Sm 3+ and the exchange interaction between Mn 3+ and Sm 3+ ions. The sinusoidal spin ordering in TbMnO 3 and DyMnO 3 can be phenomenologically described by the 3D-Heisenberg model. Finally, the hexagonal manganites RMnO 3 (R = Ho, Er, Tm, Yb, Lu, Y) are close to the 3D-Heisenberg universality class, ruling out the chiral models predicted by the renormalization group theory.

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Review/Synthèse: Triangular antiferromagnets

Cited by 477 publications

References 240 publications

Effect of Spin Dilution on the Magnetic State of Delafossite CuFeO2 with an S = 5/2 Antiferromagnetic Triangular Sublattice

Effect of Spin Dilution on the Magnetic State of Delafossite CuFeO2 with an S = 5/2 Antiferromagnetic Triangular Sublattice

Untitled

Critical behavior of the paramagnetic to antiferromagnetic transition in orthorhombic and hexagonal phases ofRMnO3(R=Sm
Oleaga
¹
,
Salazar
²
,
Prabhakaran
³

et al. 2012
Phys. Rev. B
57
6
49
0
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Review/Synthèse: Triangular antiferromagnets

Cited by 477 publications

References 240 publications

Effect of Spin Dilution on the Magnetic State of Delafossite CuFeO2 with an S = 5/2 Antiferromagnetic Triangular Sublattice

Effect of Spin Dilution on the Magnetic State of Delafossite CuFeO2 with an S = 5/2 Antiferromagnetic Triangular Sublattice

Untitled

Critical behavior of the paramagnetic to antiferromagnetic transition in orthorhombic and hexagonal phases ofRMnO3(R=SmOleaga1, Salazar2, Prabhakaran3 et al. 2012Phys. Rev. B576490View full textAdd to dashboardCite

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Critical behavior of the paramagnetic to antiferromagnetic transition in orthorhombic and hexagonal phases ofRMnO3(R=Sm
Oleaga
¹
,
Salazar
²
,
Prabhakaran
³

et al. 2012
Phys. Rev. B
57
6
49
0
View full text Add to dashboard Cite