Journal Article

FZJ-2016-00816

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Charge correlations in cobaltates La 2- x Sr x CoO 4

Guo, H. ; Schmidt, W.FZJ* ; Tjeng, L. H. ; Komarek, A. C. (Corresponding author)

2015
Wiley-VCH Weinheim

This record in other databases:  

Please use a persistent id in citations: doi:10.1002/pssr.201510290

Abstract: Nano-phase separation in La2–xSrx CoO4 (schematically). Red areas: undoped La2CoO4 islands, blue areas: checkerboard charge ordered regions; black, green and blue balls represent nonmagnetic Co3+ ions, magnetic Co2+ ions and oxygen ions, respectively; green arrows indicate Co2+ spins [1, 2].We report on an elastic neutron scattering study of the charge correlations in La2–xSrx CoO4 with x = 1/3, 0.4 and 0.5. We found that the checkerboard charge ordering correlations present in the x = 0.5 sample persist in the x = 0.4 and 1/3 materials. These checkerboard charge ordering correlations are robust and explain the occurrence of nano-phase separation in layered cobaltates for Sr-concentrations away from half-doping. The half-integer reflections then arise from the nanometer-sized hole-rich regions (blue areas in title figure) instead of the undoped ones (red areas in title figure). The appearance of nano-phase separation is an important ingredient for understanding the formation of hour-glass shaped magnetic excitation spectra in La2–xSrx CoO4.

---

Contributing Institute(s):

1. Streumethoden (JCNS-2)
2. Streumethoden (PGI-4)
3. JARA-FIT (JARA-FIT)
4. JCNS-ILL (JCNS-ILL)

Research Program(s):

1. 144 - Controlling Collective States (POF3-144) (POF3-144)
2. 524 - Controlling Collective States (POF3-524) (POF3-524)
3. 6212 - Quantum Condensed Matter: Magnetism, Superconductivity (POF3-621) (POF3-621)
4. 6213 - Materials and Processes for Energy and Transport Technologies (POF3-621) (POF3-621)
5. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)

Appears in the scientific report 2015

---

Database coverage:
Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; No Authors Fulltext ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

---