Download presentation

Presentation is loading. Please wait.

Published byAngela Chaddock Modified over 4 years ago

1
140K 2K k=? PrMn 7 O 12 Rhombo : magnetic peaks unindexed Bank 1 Bank 2 Bank 4 Bank 3 Bank 5Bank 6

2
PrMn 7 O 12 Rhombo at 140K showing quite a few impurity peaks

3
PrMn 7 O 12 Monoclinic : obviously, a k=(0 0 0) structure (magnetic on top of nuclear) 2K 150K k=(000) Bank 1 Bank 2 Bank 4 Bank 3 Bank 5Bank 6

4
PrMn 7 O 12 Monoclinic at 2K indexed with k=(0 0 0) propagation vector But A-type structure must have k=(0 1 0): structure cannot be A-type Mag: H+k k=(0 1 0) Nuc t=(½ ½ ½) S S’ S S’=S.exp(2i .k.t) S’=-S (S’=S for k=(0 0 0)) A-type

5
PrMn 7 O 12 Monoclinic at 2K indexed with k=(0 0 0) propagation vector Prelim solution involving only Mn B-site C-type

6
Conclusions Monoc phase : On dataset at RT, and 150K and 2K in cryo (10 times worse statistics because of cryo bckgd) No visible structural transition down to 2K and fit not “exceptional” (R_B>10%) mag structure k=(000) but no final model (check for A-site cation contrib/other models.…) Rhombo phase: only 2K and 140K collected in cryo as for the monoc sample, no visible structural transition down to 2K and relatively bad fits (R_B>10%) more visibly impure, propagation vector(s) indexing magnetic reflections yet unknown

Similar presentations

OK

For Museum cataloguing. Nomenclature Nomenclature is a tool for cataloguing museum collections, it provides a structured and controlled list of terms.

For Museum cataloguing. Nomenclature Nomenclature is a tool for cataloguing museum collections, it provides a structured and controlled list of terms.

© 2018 SlidePlayer.com Inc.

All rights reserved.

To make this website work, we log user data and share it with processors. To use this website, you must agree to our Privacy Policy, including cookie policy.

Ads by Google