Document Type

Article

Publication Date

8-25-2010

Journal or Book Title

Physical Review B

Volume

82

Issue

6

First Page

060514(R)

DOI

10.1103/PhysRevB.82.060514

Abstract

The structural and magnetic phase transitions have been studied on NdFeAsO single crystals by neutron and x-ray diffraction complemented by resistivity and specific-heat measurements. Two low-temperature phase transitions have been observed in addition to the tetragonal-to-orthorhombic transition at TS∼142 K and the onset of antiferromagnetic (AFM) Fe order belowTN∼137 K. The Fe moments order AFM in the well-known stripelike structure in the (ab) plane but change from AFM to ferromagnetic (FM) arrangement along the c direction below T∗∼15 K accompanied by the onset of Nd AFM order below TNd∼6 K with this same AFM configuration. The iron magnetic order-order transition in NdFeAsO accentuates the Nd-Fe interaction and the delicate balance of c-axis exchange couplings that results in AFM in LaFeAsO and FM in CeFeAsO and PrFeAsO.

Comments

This article is from Physical Review B 82 (2010): 060514(R), doi:10.1103/PhysRevB.82.060514.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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