Neutron-diffraction studies of YMnO 3

Park, J.; Kong, U.; Pirogov, A. N.; Choi, Sang Hyoun; Park, J.-G.; Choi, Yong Eui; Lee, C.; Jo, William

doi:10.1007/s003390201806

Cited by 42 publications

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“…Muñoz et al have conducted extensive powder neutron studies of YMnO 3 and concluded that the favored magnetic symmetry is described by the Γ 1 representation ( model, Φ = 90 ∘ ) [95]. However, more recent powder neutron scattering experiments could not distinguish between the originally suggested Γ 1 and Γ 3 representations [96]. It should also be noted that combinations of different irreducible representations are possible and they describe a magnetic structure with an angle Φ between 0 ∘ and 90 ∘ .…”

Section: +mentioning

confidence: 99%

Hexagonal Manganites—(RMnO₃): Class (I) Multiferroics with Strong Coupling of Magnetism and Ferroelectricity

Lorenz

2013

ISRN Condensed Matter Physics

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Hexagonal manganites belong to an exciting class of materials exhibiting strong interactions between a highly frustrated magnetic system, the ferroelectric polarization, and the lattice. The existence and mutual interaction of different magnetic ions (Mn and rare earth) results in complex magnetic phase diagrams and novel physical phenomena. A summary and discussion of the various properties, underlying physical mechanisms, the role of the rare earth ions, and the complex interactions in multiferroic hexagonal manganites, are presented in this paper.

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Section: +mentioning

confidence: 99%

Hexagonal Manganites—(RMnO₃): Class (I) Multiferroics with Strong Coupling of Magnetism and Ferroelectricity

Lorenz

2013

ISRN Condensed Matter Physics

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“…Of these materials YMnO 3 , with a layered structure with Y ions placed between sheets of corner sharing MnO 5 triangular bipyramids, has been of particular interest [9][10][11][12][13][14][15][16]. It is ferroelectric (FE) below ∼900-1300 K and antiferromagnetic (AFM) below ∼75 K [15].…”

Section: Introductionmentioning

confidence: 99%

“…YMnO 3 orders antiferromagnetically at ∼75 K, although Néel points between 70 and 80 K have been reported [2,10,13]. Antiferromagnetism arises from the Mn 3+ ions, with S = 2 spin state, which make up a single magnetic sublattice.…”

Section: Introductionmentioning

confidence: 99%

“…The magnetoelastic coupling effect in YMnO 3 has been the subject of much work in recent years and a series of neutron diffraction experiments has been carried out to monitor changes in lattice parameters and atomic positions at T N [7,10,29,[35][36][37]. Monitoring of changes in atomic positions and bond lengths is difficult due to the small changes involved.…”

Section: Introductionmentioning

confidence: 99%

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Elastic anomalies associated with structural and magnetic phase transitions in single crystal hexagonal YMnO₃

Thomson

Chatterji

Howard

et al. 2014

J. Phys.: Condens. Matter

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Resonant ultrasound spectroscopy has been used to measure the elastic and anelastic behaviour through known structural and magnetic phase transitions in single crystal hexagonal YMnO 3 . Anomalous elastic behaviour is observed at the high temperature structural transition at ∼1260 K, with a discontinuity in the elastic constants and nonlinear recovery below T c , consistent with λeQ 2 s coupling. There is no change in dissipation associated with this high temperature transition, and no evidence in the elastic or anelastic behaviour for any secondary transition at ∼920 K, thus supporting the thesis of a single high temperature transformation. Elastic stiffening is observed on cooling through T N , in accordance with previous studies, and the excess elastic constant appears to scale with the square of the magnetic order parameter. The strains incurred at T N are a factor of ∼20 smaller than those at the structural transition, implying very weak λeQ 2 m coupling and a dominant contribution to the variation in the elastic constants from λe 2 Q 2 m . The increased acoustic dissipation above T N is consistent with an order-disorder process.

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“…6 Regarding the magnetic structure, below T N the Mn 3+ moments order in the a-b plane, and form a 2D non-collinear spin structure, characterized by an angle of 120 o between the neighbouring spins. [7][8][9] Consequent to the 2D magnetism and triangular lattice, the magnetic structure of YMnO 3 is frustrated, characterized by the frustration factor f = |Θ CW |/T N , found to be as large as 7.8 for YMnO 3 . 10 Here, Θ CW is the (negative) intercept on the temperature-axis of the (interpolated) high-temperature T-linear (Curie-Weiss) inverse susceptibility of the independent-spins.…”

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Disorder-driven spin-reorientation in multiferroic h-YMn1−xFexO3

Namdeo

Rao

Kaushik

et al. 2014

Journal of Applied Physics

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Magnetic structure evolution of multiferroic hexagonal YMn 1-x Fe x O 3 (x= 0, 0.05, and 0.1) has been studied by carrying out detailed temperature-dependent neutron diffraction at zero and 5T fields.Thermodynamic data confirm antiferromagnetic ordering at T N in all the compositions. Our sub-T N neutron diffraction results assign the magnetic structure of pure YMnO 3 to Γ 1 irreducible representation. Over the perturbative-doping range, magnetic structure changes via Γ 1 +Γ 2 for YMn 0.95 Fe 0.05 O 3 on to Γ 2 for YMn 0.9 Fe 0.1 O 3 , as the maiden compositional analogue of spinreorientation; its occurrence in temperature-domain already reported for several manganites.Moreover, while the large thermal isostructural changes observed above T N are subdued in the ordered state, small alterations by the applied 5T-field are relatively uniform across, confirming strong magneto-elastic nature of the system. Decrease of the ordered magnetic moment (µ ord ) and planar magnetic frustration noted with Fe-doping is enhanced by the applied field; apparently through canting.Keywords: Multiferroics, Magneto-elasticity, Frustrated Antiferromagnet, Neutron Diffraction. PACS: 75.50.Ee, 75.85.+t , 61.05.fm, 75.75 2Materials that possess coexistent magnetic and electrical orderings in single phase are known as Multiferroics. 1 Hexagonal YMnO 3 is a member of their special class known as geometrically frustrated multiferroics, and is one of the most intensively studied h-RMnO 3 . 2 It undergoes ferroelectric (FE) transition at T C ~ 900K and antiferromagnetic (AFM) ordering at T N ~70K. [3][4] The crystal structure of h-YMnO 3 consists of alternating layers of MnO 5 trigonal bipyramids. These bipyramids (in trimer-combinations, sharing a common planar Oxygen) are corner-linked in the abplane to form a triangular lattice, and are separated from one another along the c-axis by the planes of Y-ions. 5 The geometric effect of buckling of the trimerized MnO5-bipyramids is accompanied by the inversion-symmetry-breaking displacements of Y-layers, originating the ferroelectric polarization. 6 Regarding the magnetic structure, below T N the Mn 3+ moments order in the a-b plane, and form a 2D non-collinear spin structure, characterized by an angle of 120 o between the neighbouring spins. [7][8][9] Consequent to the 2D magnetism and triangular lattice, the magnetic structure of YMnO 3 is frustrated, characterized by the frustration factor f = |Θ CW |/T N , found to be as large as 7.8 for YMnO 3 . 10 Here, Θ CW is the (negative) intercept on the temperature-axis of the (interpolated) high-temperature T-linear (Curie-Weiss) inverse susceptibility of the independent-spins. The antiferromagnetic (AFM) order is governed by the in-plane Mn-O-Mn super-exchange interaction, whereas the Mn-O-O-Mn supersuper-exchange interaction between the stacked triangular planes is about two order of magnitude weaker. This weak inter-layer (z=0 and z=1/2), 4,7,11 configuration is the one that differentiates among the several magnetic structures proposed f...

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Neutron-diffraction studies of YMnO 3

Cited by 42 publications

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Hexagonal Manganites—(RMnO₃): Class (I) Multiferroics with Strong Coupling of Magnetism and Ferroelectricity

Hexagonal Manganites—(RMnO₃): Class (I) Multiferroics with Strong Coupling of Magnetism and Ferroelectricity

Elastic anomalies associated with structural and magnetic phase transitions in single crystal hexagonal YMnO₃

Disorder-driven spin-reorientation in multiferroic h-YMn1−xFexO3

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Neutron-diffraction studies of YMnO 3

Cited by 42 publications

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Hexagonal Manganites—(RMnO3): Class (I) Multiferroics with Strong Coupling of Magnetism and Ferroelectricity

Hexagonal Manganites—(RMnO3): Class (I) Multiferroics with Strong Coupling of Magnetism and Ferroelectricity

Elastic anomalies associated with structural and magnetic phase transitions in single crystal hexagonal YMnO3

Disorder-driven spin-reorientation in multiferroic h-YMn1−xFexO3

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Hexagonal Manganites—(RMnO₃): Class (I) Multiferroics with Strong Coupling of Magnetism and Ferroelectricity

Hexagonal Manganites—(RMnO₃): Class (I) Multiferroics with Strong Coupling of Magnetism and Ferroelectricity

Elastic anomalies associated with structural and magnetic phase transitions in single crystal hexagonal YMnO₃