Structure of lithium nickel phosphate

Abrahams, Isaac; Easson, K. S.

doi:10.1107/s0108270192013064

Cited by 65 publications

(43 citation statements)

References 4 publications

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“…23 All members of this family were found to be antiferromagnets with the same magnetic structure differing only in the spin direction; [24][25][26] however, a recent single-crystal study of LiNiPO 4 revealed that the magnetic spins are not collinear in the AFM ground state but are slightly canted within the ac plane. 27 Neutron-scattering studies demonstrated that LiMPO 4 ͑M = Ni, Co, and Mn͒ exhibit properties between two dimensions ͑2D͒ and three dimensions ͑3D͒ with an interlayer coupling that is stronger relative to the coupling found in the cuprates, for instance.…”

Section: -0121/2009/79͑17͒/174435͑7͒mentioning

confidence: 99%

Tweaking the spin-wave dispersion and suppressing the incommensurate phase inLiNiPO4by iron substitution

Jensen

Andersen

et al. 2009

Phys. Rev. B

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Elastic and inelastic neutron-scattering studies of Li͑Ni 1−x Fe x ͒PO 4 single crystals reveal anomalous spinwave dispersions along the crystallographic direction parallel to the characteristic wave vector of the magnetic incommensurate phase. The anomalous spin-wave dispersion ͑magnetic soft mode͒ indicates the instability of the Ising-type ground state that eventually evolves into the incommensurate phase as the temperature is raised. The pure LiNiPO 4 system ͑x =0͒ undergoes a first-order magnetic phase transition from a long-range incommensurate phase to an antiferromagnetic ͑AFM͒ ground state at T N = 20.8 K. At 20% Fe concentrations, although the AFM ground state is to a large extent preserved as that of the pure system, the phase transition is second order, and the incommensurate phase is completely suppressed. Analysis of the dispersion curves using a Heisenberg spin Hamiltonian that includes interplane and in-plane nearest-and next-nearest-neighbor couplings reveals frustration due to strong competing interactions between nearest-and next-nearest-neighbor sites, consistent with the observed incommensurate structure. The Fe substitution only slightly lowers the extent of the frustration, sufficient to suppress the incommensurate phase. An energy gap in the dispersion curves gradually decreases with the increase in Fe content from ϳ2 meV for the pure system ͑x =0͒ to ϳ0.9 meV for x = 0.2.

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Section: -0121/2009/79͑17͒/174435͑7͒mentioning

confidence: 99%

Tweaking the spin-wave dispersion and suppressing the incommensurate phase inLiNiPO4by iron substitution

Jensen

Andersen

et al. 2009

Phys. Rev. B

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“…The lithium orthophosphates LiMPO 4 (M = = Co 2+ or Ni 2+ ) are isostructural with the minerals lithiophilite (M = Mn) and triphilite (M = Fe), which belong to the olivine family [1,11,12]. The orthorhombic unit cell contains four formula units and is described by space group Pnma (D 2h 16 ) [12].…”

Section: Structural and Magnetic Features Of Linipomentioning

confidence: 99%

“…The orthorhombic unit cell contains four formula units and is described by space group Pnma (D 2h 16 ) [12].…”

Section: Structural and Magnetic Features Of Linipomentioning

confidence: 99%

Raman scattering in a LiNiPO4 single crystal

Фомин

Gnezdilov

Kurnosov

et al. 2002

Low Temperature Physics

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“…LiNiPO 4 is an antiferromagnetic (AF) insulator [9,10] which belongs to the olivine family of lithium orthophosphates LiMPO 4 (M = Mn, Fe, Co, and Ni) [11]; space group is Pnma [12]. Neutron scattering studies demonstrated that LiMPO 4 (M =Ni, Co) exhibit properties between the two-dimensional (2D) and three-dimensional (3D) with an interlayer coupling that is relatively stronger than the coupling found in the cuprates, for instance [13,14].…”

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Commensurate-Incommensurate Magnetic Phase Transition in Magnetoelectric Single CrystalLiNiPO4

et al. 2004

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Neutron scattering studies of single-crystal LiNiPO4 reveal a spontaneous first-order commensurate-incommensurate magnetic phase transition. Short-and long-range incommensurate phases are intermediate between the high temperature paramagnetic and the low temperature antiferromagnetic phases. The modulated structure has a predominant antiferromagnetic component, giving rise to satellite peaks in the vicinity of the fundamental antiferromagnetic Bragg reflection, and a ferromagnetic component giving rise to peaks at small momentum-transfers around the origin at (0, ±Q, 0). The wavelength of the modulated magnetic structure varies continuously with temperature. It is argued that the incommensurate short-and long-range phases are due to spindimensionality crossover from a continuous to the discrete Ising state. These observations explain the anomalous first-order transition seen in the magnetoelectric effect of this system. . There has been a continuous interest in the spontaneous and magnetic-field induced commensurate-incommensurate magnetic (C-IC) transition over the years [4,5,6]. For instance, in the semimetallic europium tri-arsenide (EuAs 3 ), the ground state of the system is commensurate and as temperature increases the system undergoes a C-IC transition [4]. In copper metaborate, on the other hand, the ground state is incommensurate and undergoes a continuous phase transition to a non-collinear commensurate antiferromagnetic state [7]. It has also been demonstrated that the C-IC transition can be induced by the application of an external magnetic field [5,6].Here, we report a novel C-IC magnetic phase transition in the weakly coupled antiferromagnetic planes of LiNiPO 4 (S=1, Ni 2+ ), its characteristics resemble IC structural phase transitions [8]. LiNiPO 4 is an antiferromagnetic (AF) insulator[9, 10] which belongs to the olivine family of lithium orthophosphates LiMPO 4 (M = Mn, Fe, Co, and Ni) [11]; space group is Pnma[12]. Neutron scattering studies demonstrated that LiMPO 4 (M =Ni, Co) exhibit properties between the two-dimensional (2D) and three-dimensional (3D) with an interlayer coupling that is relatively stronger than the coupling found in the cuprates, for instance [13,14]. These insulators also exhibit a strong linear magnetoelectric (ME) effect, with the observed ME tensor components, α xy , α yx , for LiCoPO 4 and, α xz , α zx , for LiNiPO 4 , in agreement with the antiferromagnetic point groups mmm' and mm'm, respectively, but with some anomalies [15,16,17]. In particular, the ME effect measurements of LiNiPO 4 as a function of temperature reveal a first-order AF transition, and an unusual decrease of the ME coefficient at temperatures below a maximum close to T N [18]. By contrast, the isostructural LiCoPO 4 , LiFePO 4 , and LiMnPO 4 exhibit continuous change of the ME coefficients, indicative of second-order transitions [15]. Magnetic susceptibility studies of polycrystalline LiNiPO 4 showed a significant deviation from the Curie-Weiss law in a temperature range much higher than T N , and...

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Structure of lithium nickel phosphate

Cited by 65 publications

References 4 publications

Tweaking the spin-wave dispersion and suppressing the incommensurate phase inLiNiPO4by iron substitution

Tweaking the spin-wave dispersion and suppressing the incommensurate phase inLiNiPO4by iron substitution

Raman scattering in a LiNiPO4 single crystal

Commensurate-Incommensurate Magnetic Phase Transition in Magnetoelectric Single CrystalLiNiPO4

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