Stripe disorder and dynamics in the hole-doped antiferromagnetic insulator La5/3Sr1/3CoO

Abstract

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.

Direct evidence for charge stripes in a layered cobalt oxide

“…Charge stripe correlations develop continuously on cooling from room temperature down to 100 K, below which the signal remains constant. This temperature variation is consistent with the observation of charge freezing at ∼100 K in magnetic resonance experiments1213. The associated spin stripe-scattering begins to increase below ∼100 K. The separation of the magnetic peaks changes only slightly between 2 and ∼90 K (see Supplementary Note 2), consistent with the notion that the magnetic peaks are associated with the charge stripe order, which is fully developed at 100 K. A similar behaviour was observed in La 5/3 Sr 1/3 NiO 4 (ref.…”

“…Consistent with this, indirect evidence for charge freezing at ∼100 K was inferred from magnetic resonance experiments on La 2− x Sr x CoO 4 (refs 12, 13). Until now, however, attempts to detect charge stripe order in the cobaltates more directly by neutron and X-ray diffraction have been unsuccessful.…”

Inverse order-disorder transition of charge stripes

“…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.…”

Magnetic phase diagram ofLa2−xSrxCoO4revised using muon-spin relaxation

“…1(c). The previous μSR study on x = 0.33 demonstrated sensitivity to slow fluctuations and the freezing of dynamics [9]. To follow these features datasets were heavily binned to filter out high-frequency components and fitted to A(t) = A rel e −(λt) β + A b , where A rel and A b are the relaxing and nonrelaxing baseline amplitudes, respectively, and β was constrained to be greater than 0.5 [10].…”

“…However, the origin of the hourglass spectrum and the nature of the CO in this region remain controversial [38][39][40]. The results of μSR and NMR measurements of the x = 1/3 compound revealed the onset of magnetic order within partially disordered charge and spin stripes at around 35 K, with a further glassy freezing of dynamics involving the slow, collective motion of spins within the magnetic stripes at lower temperatures [9]. We find that the μSR of x = 0.25 is similar to the x = 0.33 material, although the slightly broader features preclude the identification of a second freezing feature at lower temperatures.…”