An hour-glass magnetic spectrum in an insulating, hole-doped antiferromagnet

Boothroyd, A. T.; Babkevich, P.; Prabhakaran, D.; Freeman, P. G.

doi:10.1038/nature09902

Cited by 65 publications

(120 citation statements)

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“…In particular, the inverse order-disorder transition of the interlayer charge order observed in this work may provide a new direction to understand the dominance of the dynamical stripes in cuprates. Further extension of the current work to study the dynamical interlayer correlations in La 1.67 Sr 0.33 NiO 4 [20,31] and its sister compound La 1.67 Sr 0.33 CoO 4 [32,33] may help to elucidate the unusual transport behavior caused by the charge/spin stripes in the transition metal oxides.…”

Section: (E)mentioning

confidence: 99%

Inverse order-disorder transition of charge stripes

Lee

Lai

et al. 2015

Phys. Rev. B

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We report an unusual transition behavior of charge stripes in La 1.67 Sr 0.33 NiO 4 using x-ray scattering. The segregated holes in La 1.67 Sr 0.33 NiO 4 are observed to form anisotropic stripes in the a × b plane of the crystal space below the transition temperature T 238 K, and at the same time, display an unusual inverse order-disorder transition along the c axis. Using a phenomenological Landau theory, we show that this inverse transition is due to the interlayer coupling between the charge and spin orders. This discovery points to the importance of the interlayer correlations in the strongly correlated electrons system. Doped Mott insulators have served as a rich playground for strongly correlated electron systems, yet the physics is still not fully comprehended. The complexity results from the interplay between competing orders, such as charge, spin, orbital, and lattice, and the strong quantum fluctuations [1]. In the model system of high-T c superconductor La 2 CuO 4 , substitution of La with Sr or Ba induces segregated holes that form unidirectional self-organized electronic stripes in the a × b plane of the crystal space [2]. Experimentally, such a phenomenon has been observed in neutron, x-ray, and electron diffractions, and it is shown that transport behavior depends strongly on the hole concentration [3,4]. These ordered electronic phases are understood to arise due to the Coulomb-frustrated separation of electronic domains at the nanoscale [5,6]. In these phases, there exist locally Mott insulating regions with magnetic (spin) order, separated by more metallic regions with higher concentrations of doped holes. Taking the in-plane fluctuations into consideration, these ordered charges could form the exotic electronic liquid-crystal phases [7,8]. This intralayer coupling between the ordered charges and spins has been widely discussed and observed in Cu-and Fe-based * chd@mail.tku.edu.tw † yjkao@phys.ntu.edu.tw superconductors [9][10][11][12]. It is natural to ask what role the interlayer coupling between the charge and spin orders in different planes plays in these systems [13,14].Using x-ray scattering measurements on single-crystal samples of La 2−x Sr x NiO 4 (LSNO), we report an unusual inverse order-disorder transition due to the interlayer coupling of the in-plane charges and spins. It is well established that there can exist both smectic and striped-liquid phases of in-plane charge and spin ordering in LSNO [15][16][17][18]. LSNO has a tetragonal structure [ Fig. 1(a)], and is isostructural with the superconducting cuprate LSCO. Both LSNO and LSCO are antiferromagnetic (AFM) Mott insulators in the absence of hole doping. While LSCO becomes a high-T c superconductor for small amounts of hole doping, LSNO remains insulating for doping levels of up to 90% [19].In LSNO the doped holes condense, leaving, within each two-dimensional (2D) NiO layer, an alternating pattern of AFM domains (spin stripes) separated by charge stripes [ Fig. 1(b)]. In the reciprocal space of the tetragonal crystal structur...

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Section: (E)mentioning

confidence: 99%

Inverse order-disorder transition of charge stripes

Lee

Lai

et al. 2015

Phys. Rev. B

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“…Although many cuprates exhibit hourglass dispersion and show no evidence for stripe order, the discovery of such an excitation spectrum in stripe-ordered cobaltate materials provided strong evidence that the hourglass dispersion results from short-range stripe correlations [15,16]. The main features of the hourglass spectrum can be reproduced by the spin-wave spectrum of perfectly ordered, weakly coupled antiferromagnetic (AFM) stripes [ Fig.…”

Section: Use Policymentioning

confidence: 99%

Stripe disorder and dynamics in the hole-doped antiferromagnetic insulator La5/3Sr1/3CoO
Lancaster
¹
,
Giblin
²
,
Allodi
³

et al. 2014
Phys. Rev. B
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2
22
1
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Citation for published item:vnsterD F nd qilinD FF nd ellodiD q F nd fordignonD F nd wzzniD wF nd he enziD F nd preemnD FqF nd fkerD FtF nd rttD pFvF nd fkevihD F nd flundellD FtF nd foothroydD eFF nd w¤ ollerD tFF nd rhkrnD hF @PHIRA 9tripe disorder nd dynmis in the holeEdoped ntiferromgneti insultor vSGQrIGQgoyRF9D hysil review fFD VW @PAF HPHRHS@AF Further information on publisher's website: eprinted with permission from the emerin hysil oietyX F vnsterD F F qilinD qF ellodiD F fordignonD wF wzzniD F he enziD F qF preemnD F tF fkerD pF vF rttD F fkevihD F tF flundellD eF F foothroydD tF F w¤ ollerD nd hF rhkrnD hysil eview fD VWD HPHRHS@AD PHIR PHIR y the emerin hysil oietyF eders my viewD rowseD ndGor downlod mteril for temporry opying purposes onlyD provided these uses re for nonommeril personl purposesF ixept s provided y lwD this mteril my not e further reproduedD distriutedD trnsmittedD modi(edD dptedD performedD displyedD pulishedD or sold in whole or prtD without prior written permission from the emerin hysil oietyF Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. We investigate the magnetic ordering and dynamics of the stripe phase of La 5/3 Sr 1/3 CoO 4 , a material shown to have an hourglass magnetic excitation spectrum. A combination of muon-spin relaxation, nuclear magnetic resonance, and magnetic susceptibility measurements strongly suggest that the physics is determined by a partially disordered configuration of charge and spin stripes whose frustrated magnetic degrees of freedom are dynamic at high temperature and which undergo an ordering transition around 35 K with coexisting dynamics that freeze out in a glassy manner as the temperature is further reduced.

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“…The real space pattern of charge order varies by material (6)(7)(8)(9), but a typically observed motif is some variety of charge stripes. Such stripes have been observed in cobaltites (10)(11)(12), cuprates (13)(14)(15), nickelates (16)(17)(18)(19), and manganites (20)(21)(22), albeit with highly materials-dependent configurations that hinge on a balance among Coulomb, lattice, and magnetic exchange energies. For instance, charge stripes in layered nickelates typically stagger themselves from layer to layer to reduce the collective electrostatic energy arising from the charge disproportionation (9,18).…”

mentioning

confidence: 92%

Stacked charge stripes in the quasi-2D trilayer nickelate La ₄ Ni ₃ O ₈

Zhang

Chen

Phelan

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

100

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The quasi-2D nickelate La 4 Ni 3 O 8 (La-438), consisting of trilayer networks of square planar Ni ions, is a member of the so-called T′ family, which is derived from the Ruddlesden-Popper (R-P) parent compound La 4 Ni 3 O 10−x by removing two oxygen atoms and rearranging the rock salt layers to fluorite-type layers. Although previous studies on polycrystalline samples have identified a 105-K phase transition with a pronounced electronic and magnetic response but weak lattice character, no consensus on the origin of this transition has been reached. Here, we show using synchrotron X-ray diffraction on high-pO 2 floating zone-grown single crystals that this transition is associated with a real space ordering of charge into a quasi-2D charge stripe ground state. The charge stripe superlattice propagation vector, q = (2/3, 0, 1), corresponds with that found in the related 1/3-hole doped single-layer R-P nickelate, La 5/3 Sr 1/3 NiO 4 (LSNO-1/3; Ni 2.33+ ), with orientation at 45°to the Ni-O bonds. The charge stripes in La-438 are weakly correlated along c to form a staggered ABAB stacking that reduces the Coulomb repulsion among the stripes. Surprisingly, however, we find that the charge stripes within each trilayer of La-438 are stacked in phase from one layer to the next, at odds with any simple Coulomb repulsion argument.charge stripe | charge order | nickelate | strongly correlated materials | transition metal oxides C ompetition between localized and itinerant electron behavior is an organizing construct in our understanding of correlated electron transition metal oxide (TMO) physics (1-4). Some of the most compelling phenomenology in these materials occurs in the mixed valent state for the transition metal, which is set by composition, doping, and anion coordination of the metal. Many mixed valent TMOs adopt insulating "charge ordered" states, in which an inhomogeneous but long-range ordered configuration of the charge density condenses from a uniform metallic state (5). The real space pattern of charge order varies by material (6-9), but a typically observed motif is some variety of charge stripes. Such stripes have been observed in cobaltites (10-12), cuprates (13-15), nickelates (16)(17)(18)(19), and manganites (20-22), albeit with highly materials-dependent configurations that hinge on a balance among Coulomb, lattice, and magnetic exchange energies. For instance, charge stripes in layered nickelates typically stagger themselves from layer to layer to reduce the collective electrostatic energy arising from the charge disproportionation (9, 18).Indeed, the case of nickelates plays a prominent role in charge stripe physics (6-9, 16-19, 23-28), because mixed valent Ni 2+ (d 8 ) and Ni 3+ (d 7 ) compounds, such as La 2 − x Sr x NiO 4 (LSNO), are structurally and electronically related to high T c superconductors and thus, have been targeted as potential alternatives to the cuprates. Instead of superconductivity, however, the ground state of such quasi-2D, octahedrally coordinated nickelates is marked by stati...

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An hour-glass magnetic spectrum in an insulating, hole-doped antiferromagnet

Cited by 65 publications

References 29 publications

Inverse order-disorder transition of charge stripes

Inverse order-disorder transition of charge stripes

Stripe disorder and dynamics in the hole-doped antiferromagnetic insulator La5/3Sr1/3CoO
Lancaster
¹
,
Giblin
²
,
Allodi
³

et al. 2014
Phys. Rev. B
Self Cite
16
2
22
1
View full text Add to dashboard Cite

Stacked charge stripes in the quasi-2D trilayer nickelate La ₄ Ni ₃ O ₈

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An hour-glass magnetic spectrum in an insulating, hole-doped antiferromagnet

Cited by 65 publications

References 29 publications

Inverse order-disorder transition of charge stripes

Inverse order-disorder transition of charge stripes

Stripe disorder and dynamics in the hole-doped antiferromagnetic insulator La5/3Sr1/3CoOLancaster1, Giblin2, Allodi3 et al. 2014Phys. Rev. BSelf Cite162221View full textAdd to dashboardCite

Stacked charge stripes in the quasi-2D trilayer nickelate La 4 Ni 3 O 8

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Stripe disorder and dynamics in the hole-doped antiferromagnetic insulator La5/3Sr1/3CoO
Lancaster
¹
,
Giblin
²
,
Allodi
³

et al. 2014
Phys. Rev. B
Self Cite
16
2
22
1
View full text Add to dashboard Cite

Stacked charge stripes in the quasi-2D trilayer nickelate La ₄ Ni ₃ O ₈