Microscopic Evidence of Spin State Order and Spin State Phase Separation in Layered Cobaltites RBaCo2O5.5 with R=Y, Tb, Dy, and Ho

We report muon spin relaxation measurements on the magnetic structures of RBaCo_2O_5.5 with R=Y, Tb, Dy, and Ho. Three different phases, one ferrimagnetic and two antiferromagnetic, are identified below 300 K. They consist of different ordered spin state arrangements of high-, intermediate-, and low...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2008-05
Main Authors: Luetkens, H, Stingaciu, M, Pashkevich, Yu G, Conder, K, Pomjakushina, E, Gusev, A A, Lamonova, K V, Lemmens, P, H -H Klauss
Format: Article
Language:English
Subjects:
Antiferromagnetism
Dysprosium
Ferrimagnetism
Magnetic induction
Magnetoresistance
Magnetoresistivity
Muon spin relaxation
Phase separation
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We report muon spin relaxation measurements on the magnetic structures of RBaCo_2O_5.5 with R=Y, Tb, Dy, and Ho. Three different phases, one ferrimagnetic and two antiferromagnetic, are identified below 300 K. They consist of different ordered spin state arrangements of high-, intermediate-, and low-spin Co^3+ of CoO_6 octahedra. Phase separation into well separated regions with different spin state order is observed in the antiferromagnetic phases. The unusual strongly anisotropic magnetoresistance and its onset at the FM-AFM phase boundary is explained.
ISSN:2331-8422
DOI:10.48550/arxiv.0805.4509