Saylor and Hohenemser reply

Phase Separation and Finite Size ScalinginLa2−xSrCho1, Chou2, Johnston3 1993Phys. Rev. Lett.14814850View full textAdd to dashboardCite

“…2(a) are inconsistent with a discontinuous change of T/yix) from 150 to -10 K near x =0.017 as proposed in Ref. [14].…”

Comment on ‘‘Order-disorder structural phase transition inLa2−xSrMacLaughlin1, Hammel2, Vithayathil3 et al. 1991Phys. Rev. Lett.5010View full textAdd to dashboardCite

“…If, as has been argued [1,5], the m In probe occupies the La site, the lack of a ,39 La NQR anomaly is strong evidence against an order-disorder transition. The spread in asymmetry parameter 77 provides much of the PAC linewidth.…”

“…In a recent Letter, Saylor and Hohenemser [1] reported a perturbed yy angular correlation (PAC) study of m In-m Cd deposited in Laix Sr^Cu0 4+5 . A large (~~2x) increase of the PAC quadrupolar linewidth and a similarly large decrease of the quadrupolar asymmetry parameter were observed below -150 K. These phenomena were attributed to changes in electric-field gradients at probe-nuclei sites due to a reversible order-disorder structural phase transition in the intrinsic material, assuming that the probe is sensitive to electric-field gradients which are characteristic of the host.…”

“…Thus there is no evidence in our NQR spectra for structural disorder in the end compound La2Cu04+<s. It has been suggested [1] that the transition is suppressed by excess oxygen, of which the depression of T N is a very sensitive indicator. For our most nearly stoichiometric sample 7^ -305 K is about 23 K less than the highest observed value (328 K) [4].…”

Effect of localized holes on the long-range order in bilayer antiferromagnets

“…At smaller defect concentrations, i.e. for T N (x) higher than ρ s A 1 x, the critical line is [12], + Ref. [13] ▽ Ref.…”