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Hase, Masashi; Pomjakushin, Vladimir; Keller, L.; Dönni, A.; Sakai, Osamu; Yang, Tao; Cong, Rihong; Lin, Jianhua; Ozawa, Kiyoshi; Kitazawa, Hideaki

doi:10.1103/physrevb.84.184435

Cited by 12 publications

(19 citation statements)

References 42 publications

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“…In addition to the FM intratrimer and intertrimer interactions along the chain axis, the interchain interaction is also reasonably strong in CaNi 3 P 4 O 14 , as estimated by the first-principles calculations [26]. The consequence of the strong interchain interaction in the present CaNi 3 P 4 O 14 compound is revealed by the observed higher 3D long-range magnetic ordering temperature of T c =16 K as compared to the Mn-based compound (T N = 2.2 K) [24]. Another consequence of the stronger interchain interactions is the value of ordered moments.…”

Section: Short-range Magnetic Correlationssupporting

confidence: 67%

Long-range and short-range magnetic correlations, and microscopic origin of net magnetization in the spin-1 trimer chain compoundCaNi3P4O14

et al. 2016

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Spin-spin correlations and microscopic origin of net magnetization in the spin-1 trimer chain compound CaNi3P4O14 have been investigated by powder neutron diffraction. The present study reveals a three dimensional long-range magnetic ordering below 16 K where the magnetic structure consists of ferromagnetic trimers that are coupled ferromagnetically along the spin-chain direction (b axis). The moment components along the a and c axes arrange antiferromagnetically. Our study establishes that the uncompensated moment components along the b axis (m b ) result in a net magnetization per unit cell. The magnetic structure, determined in the present study, is in agreement with the results of recent first principles calculation; however, it is in contrast to a fascinating experimental prediction of ferrimagnetic ordering based on the periodicity of the exchange interactions in CaNi3P4O14. Our study also confirms the presence of broad diffuse magnetic scattering, due to 1D short-range spin-spin correlations, over a wide temperature range below ∼ 50 K down to a temperature well below the Tc. Total neutron scattering analysis by the reverse Monte Carlo (RMC) method reveals that the dominating spin-spin correlation above Tc is ferromagnetic and along the b axis. The nearest neighbor spin-spin correlations along the a and c axes are found to be weakly antiferromagnetic. The nature of the trimer spin structure of the short-range ordered state (above Tc) is similar to that of the 3D long-range ordered state (below Tc). The present investigation of microscopic nature of the magnetic ground state also explains the condition required for the 1/3 magnetization plateau to be observed in the trimer spin-chains. In spite of the S = 1 trimer chain system, the present compound CaNi3P4O14 is found to be a good realization of three dimensional magnet below the Tc = 16 K with full ordered moment values of ∼ 2 µB/Ni 2+ (1.98 and 1.96 µB/Ni 2+ for two Ni sites, respectively) at 1.5 K.PACS numbers: 75.30.-m, 75.25.-j, 75.40.Cx * akbera@barc.gov.in † smyusuf@barc.gov.in ‡ Present address:

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Section: Short-range Magnetic Correlationssupporting

confidence: 67%

Long-range and short-range magnetic correlations, and microscopic origin of net magnetization in the spin-1 trimer chain compoundCaNi3P4O14

et al. 2016

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“…30 In the Heisenberg model, frustration between nearest-neighbour (NN) and next-nearest-neighbour (NNN) exchange interactions can likewise cause a spiral structure. 31,32 An alternative explanation for a non-collinear spiral-AFM builds on the stability of the band structure. Earlier reports in Mn-based orthorhombic systems indicated that a high density of states at the Fermi surface (N(E F )) makes FM unstable while a non-collinear AFM can reduce N(E F ).…”

Section: Introductionmentioning

confidence: 99%

Magnetic and Structural Transitions Tuned through Valence Electron Concentration in Magnetocaloric Mn(Co_1–xNi_x)Ge

et al. 2018

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The structural and magnetic properties of magnetocaloric Mn(Co 1-x Ni x)Ge compounds have been studied. Two responses to the increase of valence electron concentration on substitution of Ni (3d 8 4s 2) for Co (3d 7 4s 2) in the orthorhombic phase (Pnma) are proposed: expansion of unit-cell volume and redistribution of valence electrons. We present experimental evidence for electronic redistribution associated with the competition between magnetism and bonding. This competition in turn leads to complex dependences of the reverse martensitic transformation temperature T M (orthorhombic to hexagonal (P6 3 /mmc)) and the magnetic structures on the Ni concentration. Magnetic transitions from ferromagnetic structures below x = 0.50 to noncollinear spiral antiferromagnetic structures above x = 0.55 at low temperature (e.g., 5 K) are induced by modification of the density of states at the Fermi surface due to the redistribution of valence electrons. T M is found to decrease initially with increasing Ni content and then increase. Both direct and inverse magnetocaloric effects are observed.

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“…For example, SrMn 3 P 4 O 14 has an incommensurate antiferromagnetic ground state [29] that is suppressed in the magnetic field of about 2 T giving rise to the ferrimagnetic phase on the 1/3-plateau [13]. Despite showing a very similar magnetization curve, NaFP is qualitatively different, because its ground state is ferrimagnetic already in zero field.…”

Section: Discussion and Summarymentioning

confidence: 99%

1/3 magnetization plateau and frustrated ferrimagnetism in a sodium iron phosphite

et al. 2016

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The sodium-iron phosphite NaFe 3 (HPO 3 ) 2 (H 2 PO 3 ) 6 is studied by ac-magnetic susceptibility, pulsed-field magnetization, specific heat, and high-frequency electron spin resonance (HF-ESR) measurements combined with Mössbauer spectroscopy and density-functional calculations. We show that this compound develops ferrimagnetic order below T C = 9.5 K and reveals a magnetization plateau at 1/3-saturation. The plateau extends to B c ~ 8 T, whereas above B c the magnetization increases linearly until reaching saturation at B s ~ 27 T. The Mössbauer spectroscopy reveals two magnetically non-equivalent iron sites with the 2:1 ratio. The HF-ESR spectra are consistent with a two-sublattice ferrimagnet and additionally pinpoint weak magnetic anisotropy as well as short-range spin order that persists well above T C . The ferrimagnetic order in the title compound is stabilized by a network of purely antiferromagnetic exchange interactions. The spin lattice comprises layers coinciding with the crystallographic (10-1) planes, with stronger couplings J i ~ 1.5 K within the layers and weaker couplings J i = 0.3−0.4 K between the layers. Both intralayer and interlayer couplings are frustrated. The ensuing ferrimagnetic order arises from a subtle interplay of the frustrated but nonequivalent exchange couplings. IntroductionThe magnetization of conventional isotropic antiferromagnets increases monotonically in an applied magnetic field. Fewer systems will, however, show a more complex magnetization process with flat or nearly flat regions of the magnetization curve that are known as magnetization plateaus [1]. These plateaus will normally appear at integer fractions of the total (saturation) magnetization and manifest ferrimagnetic order induced by the magnetic field. The stabilization of ferrimagnetic phases is strongly linked to the presence of magnetic frustration. For example, triangular antiferromagnets reveal a 1/3-plateau that is most pronounced in the quantum spin-1/2 regime, where the collinear ferrimagnetic phase is stabilized by quantum fluctuations [2][3][4]. It does, however, persist in the classical regime as well, thanks to the stabilization by thermal fluctuations [5,6], as in the extensively studied spin-5/2 triangular multiferroic RbFe(MoO 4 ) 2 [7][8][9]. On the other hand, even classical spin systems can show magnetization plateaus of putatively quantum nature, such as the 1/3-plateau recently observed in the spin-trimer compound SrMn 3 P 4 O 12 [10][11][12][13].In the following we report a detailed investigation of a novel iron fluorophosphite showing a pronounced magnetization plateau at 1/3-saturation. The true composition, which incorporates a very small amount of fluorine, has been discussed previously (14) but for simplicity in the present work we use an idealized composition NaFe 3 (HPO 3 ) 2 (H 2 PO 3 ) 6 , abbreviated NaFP. This approximation has no bearing on the interpretation of physical properties in the present work.The crystal structure of NaFP [14] comprises two nonequivalent positions of S...

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Spiral magnetic structure in spin-52frustrated trimerized chains in SrMn3P4O
Masashi Hase
¹
,
Vladimir Pomjakushin
²
,
L. Keller
³

et al.

Cited by 12 publications

References 42 publications

Long-range and short-range magnetic correlations, and microscopic origin of net magnetization in the spin-1 trimer chain compoundCaNi3P4O14

Long-range and short-range magnetic correlations, and microscopic origin of net magnetization in the spin-1 trimer chain compoundCaNi3P4O14

Magnetic and Structural Transitions Tuned through Valence Electron Concentration in Magnetocaloric Mn(Co_1–xNi_x)Ge

1/3 magnetization plateau and frustrated ferrimagnetism in a sodium iron phosphite

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Spiral magnetic structure in spin-52frustrated trimerized chains in SrMn3P4OMasashi Hase1, Vladimir Pomjakushin2, L. Keller3 et al.

Cited by 12 publications

References 42 publications

Long-range and short-range magnetic correlations, and microscopic origin of net magnetization in the spin-1 trimer chain compoundCaNi3P4O14

Long-range and short-range magnetic correlations, and microscopic origin of net magnetization in the spin-1 trimer chain compoundCaNi3P4O14

Magnetic and Structural Transitions Tuned through Valence Electron Concentration in Magnetocaloric Mn(Co1–xNix)Ge

1/3 magnetization plateau and frustrated ferrimagnetism in a sodium iron phosphite

Contact Info

Product

Resources

About

Spiral magnetic structure in spin-52frustrated trimerized chains in SrMn3P4O
Masashi Hase
¹
,
Vladimir Pomjakushin
²
,
L. Keller
³

et al.

Magnetic and Structural Transitions Tuned through Valence Electron Concentration in Magnetocaloric Mn(Co_1–xNi_x)Ge