title: Modulation of atomic positions in CaCuxMn(7-x)O12 (x < or = 0.1).
abstract: The modulation of atomic positions in CaCu(x)Mn(7-x)O12 (x = 0 and 0.1) was studied using synchrotron radiation powder diffraction below 250 and 220 K, respectively. The copper-rich member CaCu(x)Mn(7-x)O12 (x = 0.23) does not show any modulation of the atomic positions at temperatures as low as 10 K. Using low-temperature neutron powder diffraction the modulation of the magnetic moments of Mn ions in CaCu(x)Mn(7-x)O12 (x = 0, 0.1 and 0.23) has been investigated. Long-range modulated magnetic ordering in CaCu(x)Mn(7-x)O12 (x = 0, 0.1 and 0.23) is observed below 90.4, 89.2 and 78.1 K. (0,0,q(p)) and (0,0,q(m)) are the propagation vectors describing the modulations of the atomic positions and the magnetic moments. For CaCu(x)Mn(7-x)O12 (x = 0 and 0.1) the magnetic modulation and atomic modulation lengths are related by a factor of 2 satisfying the relation (1-q(p)) = 2(1-q(m)).
authors.affiliation: Institute of Experimental Physics, University of Warsaw, 00-681 Warsaw, Hoza 69, Poland.
authors.forename: W
authors.initials: W
authors.lastname: Sławiński
authors.forename: R
authors.initials: R
authors.lastname: Przeniosło
authors.forename: I
authors.initials: I
authors.lastname: Sosnowska
authors.forename: M
authors.initials: M
authors.lastname: Bieringer
authors.forename: I
authors.initials: I
authors.lastname: Margiolaki
authors.forename: E
authors.initials: E
authors.lastname: Suard