The magnetic structure of clinopyroxene-type LiFeGe2O6 and revised data on multiferroic LiFeSi2O6

Redhammer, Günther J.; Roth, Georg; Treutmann, W.; Hoelzel, Markus; Paulus, Werner; André, G.; Pietzonka, Clemens; Amthauer, Georg

doi:10.1016/j.jssc.2009.06.013

Cited by 57 publications

(43 citation statements)

References 27 publications

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“…18 The magnetic structure has been determined to be antiferromagnetically coupled ferromagnetic chains with magnetic space group P 2 1 /c ′ . 22 This magnetic structure allows for magnetoelectric effects consistent with those observed.…”

Section: 21supporting

confidence: 67%

Muon-spin relaxation and heat capacity measurements on the magnetoelectric and multiferroic pyroxenesLiFeSi2O6andNaFeSi
Baker
¹
,
Lewtas
²
,
Blundell
³

et al. 2010
Phys. Rev. B
22
5
22
2
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The results of muon-spin relaxation and heat capacity measurements on two pyroxene compounds LiFeSi2O6 and NaFeSi2O6 demonstrate that despite their underlying structural similarity the magnetic ordering is considerably different. In LiFeSi2O6 a single muon precession frequency is observed below TN, consistent with a single peak at TN in the heat capacity and a commensurate magnetic structure. In applied magnetic fields the heat capacity peak splits in two. In contrast, for natural NaFeSi2O6, where multiferroicity has been observed in zero-magnetic-field, a rapid Gaussian depolarization is observed showing that the magnetic structure is more complex. Synthetic NaFeSi2O6 shows a single muon precession frequency but with a far larger damping rate than in the lithium compound. Heat capacity measurements reproduce the phase diagrams previously derived from other techniques and demonstrate that the magnetic entropy is mostly associated with the build up of correlations in the quasi-one-dimensional Fe 3+ chains.

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Section: 21supporting

confidence: 67%

Muon-spin relaxation and heat capacity measurements on the magnetoelectric and multiferroic pyroxenesLiFeSi2O6andNaFeSi
Baker
¹
,
Lewtas
²
,
Blundell
³

et al. 2010
Phys. Rev. B
22
5
22
2
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“…This allows additional different magnetic interaction pathways in P2 1 /c. Most of the "magnetic pyroxenes" order in a rather simple way below T ~40 K, from fully ferromagnetic to fully antiferromagnetic within and between the M1 chains (Cheng et al 2013;Janson et al 2014;Nenert et al 2009bNenert et al , 2010bRedhammer et al 2008Redhammer et al , 2009Redhammer et al , 2010bRedhammer et al , 2011bRedhammer et al , 2012Redhammer et al , 2013Redhammer et al , 2015. Only a few compounds are reported exhibiting a complex cycloidal magnetic ordering, among them NaFeGe 2 O 6 and NaFeSi 2 O 6 (Drokina et al 2011;Redhammer et al 2011a).…”

Section: Introductionmentioning

confidence: 99%

“…The magnetic structure of P2 1 /c LiFeGe 2 O 6 was determined by Redhammer et al (2009). It is commensurate with k = (½ 0 0) with an antiferromagnetic (AFM) coupling of spins within the M1 chains, while the inter-chain coupling is ferromagnetic (FM) via the GeA-chain and AFM via the GeB-chain.…”

mentioning

confidence: 99%

A neutron diffraction study of crystal and low-temperature magnetic structures within the (Na,Li)FeGe2O6 pyroxene-type solid solution series

et al. 2017

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an antiferromagnetic (AFM) coupling within the Fe 3+ O 6 octahedra zig-zag chains and an alternating AFM and ferromagnetic (FM) interaction between the chains, depending on the nature of the tetrahedral GeO 4 chains. The magnetic structure can be described in magnetic space group P a 2 1 /c. Close to the structural phase transition for sample with x(Na) = 0.75, magnetic ordering is observed below 15 K; however, it becomes incommensurately modulated with k = (0.344, 0, 0.063). At 4 K, the magnetic spin structure best can be described by a cycloidal arrangement within the M1 chains, the spins are within the a-c plane. Around 12 K the cycloidal structure transforms to a spin density wave (SDW) structure. For the C2/c structures, a coexistence of a simple collinear and an incommensurately modulated structure is observed down to lowest temperatures. For 0.78 ≤ x(Na) ≤ 0.82, a collinear magnetic structure with k = (0 1 0), space group P C 2 1 /c and an AFM spin structure within the M1 chains and an FM one between the spins is dominating, while the incommensurately modulated structure becomes dominating the collinear one in the samples with x(Na) = 0.88. Here the magnetic propagation vector is k = (0.28, 1, 0.07) and the spin structure corresponds again to a cycloidal structure within the M1 chains. As for the other samples, a transition from the cycloidal to a SDW structure is observed. Based on the neutron diffraction data, the appearance of two peaks in the heat capacity of Na-rich samples can now be interpreted as a transition from a cycloidal magnetic structure to a spin density wave structure of the magnetically ordered phase for the Na-rich part of the solid solution series.Keywords Clinopyroxenes · LiFeGe 2 O 6 · NaFeGe 2 O 6 · Neutron diffraction · Magnetic ordering · Cycloidal incommensurate structure · Spin density wave Abstract Solid solution compounds along the Li 1-x Na x FeGe 2 O 6 clinopyroxene series have been prepared by solid state ceramic sintering and investigated by bulk magnetic and calorimetric methods; the Na-rich samples with x(Na) > 0.7 were also investigated by lowtemperature neutron diffraction experiments in a temperature range of 4-20 K. For samples with x(Na) > 0.76 the crystal structure adopts the C2/c symmetry at all measuring temperatures, while the samples display P2 1 /c symmetry for smaller Na contents. Magnetic ordering is observed for all samples below 20 K with a slight decrease of T N with increasing Na content. The magnetic spin structures change distinctly as a function of chemical composition: up to x(Na) = 0.72 the magnetic structure can be described by a commensurate arrangement of magnetic spins with propagation vector k = (½, 0 0), Electronic supplementary material The online version of this article

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“…; X = Ge, Si) have significant interest in solid state physics due to their physical properties. Magnetic studies have been carried out for the family pyroxenes compound: there are various types of magnetic state (antiferromagnetic [1][2][3][4], ferromagnetic [3][4][5], modulated magnetic structure [6,7], spin gap state [8]) connected to the features of the pyroxene crystal structure which allows the existence of competing magnetic exchange interactions.…”

Section: Introductionmentioning

confidence: 99%

“…The magnetic structure of LiFeGe 2 O 6 pyroxene is described to have an antiferromagnetic arrangement of spins within and between the octahedral B chains ( T N = 20.5 K) [2]. NaFeGe 2 O 6 characterized by Néel temperature T N = 13 K, below T = 11.5 K the incommensurate magnetic structure with a helical spin modulation is realized [6,12].…”

Section: Introductionmentioning

confidence: 99%

Crystal Structure and Magnetic Properties in Pyroxenes Li0.7Na0.3FeGe2O6

Drokina¹,

Molokeev²,

Rezina³

2015

J. Sib. Fed. Univ., Math. phys.

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The magnetic structure of clinopyroxene-type LiFeGe2O6 and revised data on multiferroic LiFeSi2O6

Cited by 57 publications

References 27 publications

Muon-spin relaxation and heat capacity measurements on the magnetoelectric and multiferroic pyroxenesLiFeSi2O6andNaFeSi
Baker
¹
,
Lewtas
²
,
Blundell
³

et al. 2010
Phys. Rev. B
22
5
22
2
View full text Add to dashboard Cite

Muon-spin relaxation and heat capacity measurements on the magnetoelectric and multiferroic pyroxenesLiFeSi2O6andNaFeSi
Baker
¹
,
Lewtas
²
,
Blundell
³

et al. 2010
Phys. Rev. B
22
5
22
2
View full text Add to dashboard Cite

A neutron diffraction study of crystal and low-temperature magnetic structures within the (Na,Li)FeGe2O6 pyroxene-type solid solution series

Crystal Structure and Magnetic Properties in Pyroxenes Li0.7Na0.3FeGe2O6

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The magnetic structure of clinopyroxene-type LiFeGe2O6 and revised data on multiferroic LiFeSi2O6

Cited by 57 publications

References 27 publications

Muon-spin relaxation and heat capacity measurements on the magnetoelectric and multiferroic pyroxenesLiFeSi2O6andNaFeSiBaker1, Lewtas2, Blundell3 et al. 2010Phys. Rev. B225222View full textAdd to dashboardCite

Muon-spin relaxation and heat capacity measurements on the magnetoelectric and multiferroic pyroxenesLiFeSi2O6andNaFeSiBaker1, Lewtas2, Blundell3 et al. 2010Phys. Rev. B225222View full textAdd to dashboardCite

A neutron diffraction study of crystal and low-temperature magnetic structures within the (Na,Li)FeGe2O6 pyroxene-type solid solution series

Crystal Structure and Magnetic Properties in Pyroxenes Li0.7Na0.3FeGe2O6

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Muon-spin relaxation and heat capacity measurements on the magnetoelectric and multiferroic pyroxenesLiFeSi2O6andNaFeSi
Baker
¹
,
Lewtas
²
,
Blundell
³

et al. 2010
Phys. Rev. B
22
5
22
2
View full text Add to dashboard Cite

Muon-spin relaxation and heat capacity measurements on the magnetoelectric and multiferroic pyroxenesLiFeSi2O6andNaFeSi
Baker
¹
,
Lewtas
²
,
Blundell
³

et al. 2010
Phys. Rev. B
22
5
22
2
View full text Add to dashboard Cite