Agrestini, S., Chapon, L. C., Daoud-Aladine, A., Schefer, J., Gukasov, A., Mazzoli, C., Lees, Martin R. and Petrenko, O. A.. (2008) Nature of the magnetic order in Ca3Co2O6. Physical Review Letters, Vol.101 (No.9). Article no. 097207 . ISSN 0031-9007

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Abstract

We present a detailed powder and single-crystal neutron diffraction study of the spin chain compound Ca3Co2O6. Below 25 K, the system orders magnetically with a modulated partially disordered antiferromagnetic structure. We give a description of the magnetic interactions in the system which is consistent with this magnetic structure. Our study also reveals that the long-range magnetic order coexists with a shorter-range order with a correlation length scale of similar to 180 angstrom in the ab plane. Remarkably, on cooling, the volume of material exhibiting short-range order increases at the expense of the long-range order.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Neutrons -- Diffraction, Calcium compounds -- Magnetic properties, Magnetization, Ferrimagnetism
Journal or Publication Title:	Physical Review Letters
Publisher:	American Physical Society
ISSN:	0031-9007
Date:	29 August 2008
Volume:	Vol.101
Number:	No.9
Number of Pages:	4
Page Range:	Article no. 097207
Identification Number:	10.1103/PhysRevLett.101.097207
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Engineering and Physical Sciences Research Council (EPSRC), Sixth Framework Programme (European Commission) (FP6)
Grant number:	EP/CO00757/1 (EPSRC), RII3-CT-2004-506008 (FP6), RII3-CT-2003-505925 (FP6)
References:	[1] W. Shiramura et al., J. Phys. Soc. Jpn. 67, 1548 (1998). [2] H. Kageyama et al., Phys. Rev. Lett. 82, 3168 (1999). [3] H. Kageyama et al., J. Phys. Soc. Jpn. 66, 1607 (1997); H. Kageyama et al., J. Phys. Soc. Jpn. 66, 3996 (1997). [4] A. Maignan et al., Eur. Phys. J. B 15, 657 (2000). [5] V. Hardy et al., Phys. Rev. B 70, 064424 (2004). [6] D. Gatteschi and R. Sessoli, Angew. Chem., Int. Ed. 42, 268 (2003). [7] Y. B. Kudasov, Phys. Rev. Lett. 96, 027212 (2006); Y. B. Kudasov, Europhys. Lett. 78, 57005 (2007); X. Yao et al., Phys. Rev. B 74, 134421 (2006). [8] A. Maignan et al., J. Mater. Chem. 14, 1231 (2004). [9] T. Burnus et al., Phys. Rev. B 74, 245111 (2006). [10] S. Agrestini et al., Phys. Rev. B 77, 140403(R) (2008). [11] K. Takubo et al., Phys. Rev. B 71, 073406 (2005). [12] S. Aasland, H. Fjellva°g, and B. Hauback, Solid State Commun. 101, 187 (1997). [13] H. Kageyama et al., J. Phys. Soc. Jpn. 67, 357 (1998). [14] O. A. Petrenko et al., Eur. Phys. J. B 47, 79 (2005). [15] E.V. Sampathkumaran et al., Phys. Rev. B 70, 014437 (2004). [16] V. Hardy et al., Phys. Rev. B 68, 014424 (2003). [17] H. Fjellva°g et al., J. Solid State Chem. 124, 190 (1996). [18] M. Mekata, J. Phys. Soc. Jpn. 42, 76 (1977); K. Wada and T. Ishikawa, J. Phys. Soc. Jpn. 52, 1774 (1983). [19] D. A. Keen, M. J. Gutmann, and C. C. Wilson, J. Appl. Crystallogr. 39, 714 (2006). [20] Ca3Co2O6 is usually described in terms of a hexagonal cell but the system is actually trigonal. In the primitive unit cell, the magnetic propagation vector lies on a line of symmetry (x, x, x) and is transposed to (0, 0, 3x) in the hexagonal R setting. There is nothing special about x ¼ 1 3 which is inside the Brillouin zone and so the modulation does not split the magnetic peaks when x � 1 3 . [21] In our refinement we have fixed at zero the magnetic moment of the Co I ion because it is now well established [9,11,15] that the Co I ion is in a LS spin state. [22] The notation follows Kovalev’s conventions; �1 and �2 are 1D representations and �3 is two dimensional. [23] R. Fre´sard et al., Phys. Rev. B 69, 140405(R) (2004). [24] The magnetic correlation length Dð�AÞ is estimated using D ¼ 2�=FWHM. [25] M. Loewenhaupt et al., Europhys. Lett. 63, 374 (2003). [26] Data reduction and absorption corrections were performed using the procedure implemented in the SXD2001 software. M. J. Gutmann, SXD2001—A Program for Treating Data from TOF Neutron Single-Crystal Diffraction, ISISRAL, UK (2005). [27] The crystal used for the SXD experiment was twinned. The twinning consists of a nonmerohedral reverse-obverse twin. The data consisted of two components satisfying the reverse-obverse reflection condition ðh � k þ l ¼ 3nÞ=ð�h þ k þ l ¼ 3nÞ with an intensity ratio of 0.473 (2). Fullprof allowed us to use the data from both twin components in the structural refinement [J. Rodrı´guez- Carvajal, Physica (Amsterdam) 192B, 55 (1993)].
URI:	http://wrap.warwick.ac.uk/id/eprint/29359

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