Magnetic structure and spin reorientation of the Mn ions in NdMnO3

Wu, Sheng Yun; Kuo, C.; Wang, H. Y.; Li, W.-H.; Lee, K. C.; Lynn, J. W.; Liu, Ru‐Shi

doi:10.1063/1.372534

Cited by 52 publications

(33 citation statements)

References 11 publications

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“…3) series with increasing Mn 4+ ions content, one can suggest that the negative magnetization in Nd 0.9 MnO y has the same origin. On the other hand, previous neutron diffraction experiments carried out for the samples of nominal chemical composition NdMnO 3 have shown the compound to be a canted antiferromagnet, with Nd magnetic moments ordering ferromagnetically along the ferromagnetic component associated with Mn sublattice only below 13 K [28] (or they do not order at all [29]). However, according to rules for superexchange interactions, Mn 4+ -free rare-earth manganites with cooperative ordering of dz 2 orbitals have to possess antiferromagnetic (weak ferromagnetic) Mnspins order [31].…”

Section: A Change Of Sign Of the F-d Exchange Interactionsmentioning

confidence: 95%

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Magnetic properties of Nd-deficient manganites Nd0.9−Ca MnO

Troyanchuk

Khomchenko

Pastushonok

et al. 2006

Journal of Magnetism and Magnetic Materials

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Section: A Change Of Sign Of the F-d Exchange Interactionsmentioning

confidence: 95%

“…from a high temperature phase of G-type magnetic and C-type orbital ordered state to a low-temperature phase of C-type magnetic and G-type orbital ordered state, causing a reversal of the net magnetization [27]. In the case of hole-doped Ndbased manganites, no structure changes observed below T N have been reported [12,14,[28][29][30]. 2.…”

mentioning

confidence: 85%

Magnetic properties of Nd-deficient manganites Nd0.9−Ca MnO

Troyanchuk

Khomchenko

Pastushonok

et al. 2006

Journal of Magnetism and Magnetic Materials

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“…2(b), a steep rise of M toward lower T (indicated by vertical arrows) is observed in most of the crystals. The anomaly in R=La−Nd crystals well corresponds to T N for the A-type AF order [6,8,9]. The T N falls monotonically with decreasing r R from La to Gd.…”

mentioning

confidence: 85%

“…Let us first summarize in Fig. 1 the orbital (a) and spin (b) ordering temperatures (T OO and T N , respectively) on Mn sites of RMnO 3 as a function of φ, which is based on both the present and former studies [7][8][9][10]. Here, we adopt the φ at room temperature [11].…”

mentioning

confidence: 99%

Distorted perovskite witheg1configuration as a frustrated spin system

et al. 2003

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The evolution of spin-and orbital-ordered states has been investigated for a series of insulating perovskites RMnO3 (R=La,Pr,Nd,...). RMnO3 with a large GdFeO3-type distortion is regarded as a frustrated spin system having ferromagnetic nearest-neighbor and antiferromagnetic (AF) nextnearest-neighbor (NNN) interactions within a MnO2 plane. The staggered orbital order associated with the GdFeO3-type distortion induces the anisotropic NNN interaction, and yields unique sinusoidal and up-up-down-down AF ordered states in the distorted perovskites with e 1 g configuration. and e 1 g t 6 2g configurations, respectively, the e g orbital is doubly degenerate and the t 2g orbital degree of freedom is quenched. It is widely recognized that the layered-type (A-type) antiferromagnetic (AF) structure in LaMnO 3 is understood from the view point of the anisotropic superexchange (SE) interaction under the directional order of orbital [1,2]. On the other hand, the spin structure in nickelates (R =La) is distinct from the A-type AF; the socalled "up-up-down-down"-type one where two Ni sites of "up" spins are followed by two sites of "down" spins along the principal axes in the cubic unit cell. Origin of this unusual magnetic order has been a long-standing question, as well as its relations to metal-insulator transition, orbital order (OO), and charge disproportionation [3][4][5]. Recently, a similar spin structure, i.e. the up-up-down-down order in a MnO 2 plane (E-type AF order in the Wollan-Koehler notation [6]), is found in a manganite, HoMnO 3 [7] with a significantly distorted perovskite structure. This has to be a bridge between the well-understood A-type AF in manganites and the unique magnetic ground state in nickelates.In this Letter, we examine systematically the magnetic and orbital structures in a series of RMnO 3 as a function of the ionic radius (r R ) of R. The most significant effect on the crystal structure by decreasing r R is an enhancement of the cooperative rotation of the MnO 6 octahedra (the GdFeO 3 -type distortion) characterized by the decrease of Mn-O-Mn bond angle φ. Let us first summarize in Fig. 1 the orbital (a) and spin (b) ordering temperatures (T OO and T N , respectively) on Mn sites of RMnO 3 as a function of φ, which is based on both the present and former studies [7][8][9][10]. Here, we adopt the φ at room temperature [11]. The T OO monotonically increases with decreasing r R , while the magnetic transition occurs from the A-type AF to the E-type one through the incommensurate structure. We argue that the combination of OO and next-nearest-neighbor (NNN) SE interaction brings about a nontrivial effect on the magnetic ground state in the systems with the orbital degeneracy and the large GdFeO 3 -type distortion. Microscopic calculation shows that the magnetism in this system is mapped onto the frustrated spin model which well reproduces the phase diagram of RMnO 3 .A series of RMnO 3 (R=La−Dy) crystals were grown by the floating zone method. We made powder x-ray diffraction measurements on th...

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“…As a consequence of crystal field splitting and co-operative Jahn-Teller (J-T) effect, the highest occupied e g orbital orders as d 3x 2 −r 2 and d 3y 2 −r 2 alternately at adjacent Mn sites in the a-b plane [28]. Such a staggerred in-plane orbital ordering leads to a ferromagnetic alignment of spins in a-b plane and antiferromagnetic alignment along the c direction resulting in A-type AFM with T N at around 75 K [29]. As temperature is further reduced, Nd sublattice orders ferromagnetically along the a direction below 20 K the [28].…”

Section: Introductionmentioning

confidence: 99%

Spin reorientation inNdFe0.5Mn0.5O3: Neutron scattering andab initiostudy

et al. 2017

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The structural, magnetic, and electronic properties of NdFe0.5Mn0.5O3 have been studied in detail using bulk magnetization, neutron/x-ray diffraction and first principles density functional theory calculations. The material crystallizes in the orthorhombic P bnm structure, where both Mn and Fe occupy the same crystallographic site (4b). Mn/Fe sublattice of the compound orders in to a G-type antiferromagnetic phase close to 250 K where the magnetic structure belongs to Γ1 irreducible representation with spins aligned along the crystallographic b direction. This is unconventional in the sense that most of the orthoferrites and orthochromites order in the Γ4 representation below the Néel temperature.This magnetic structure then undergoes a complete spin reorientation transition with temperature in the range 75 K > ∼ T > ∼ 25 K where the magnetic structure exists as a sum of two irreducible representations (Γ1+Γ2) as seen from neutron diffraction measurements. At 6 K, the magnetic structure belongs entirely to Γ2 representation with spins aligned antiferromagnetically along the crystallographic c direction having a small ferromagnetic component (Fx). The unusual spin reorientation and correlation between magnetic ground state and electronic structure have been investigated using first principles calculations within GGA+U and GGA+U+SO formalisms.

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Magnetic structure and spin reorientation of the Mn ions in NdMnO3

Cited by 52 publications

References 11 publications

Magnetic properties of Nd-deficient manganites Nd0.9−Ca MnO

Magnetic properties of Nd-deficient manganites Nd0.9−Ca MnO

Distorted perovskite witheg1configuration as a frustrated spin system

Spin reorientation inNdFe0.5Mn0.5O3: Neutron scattering andab initiostudy

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