Chemical disorder and Pb-207 hyperfine fields in the magnetoelectric multiferroic Pb(Fe1/2Sb1/2)O-3 and its solid solution with Pb(Fe1/2Nb1/2)O-3

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10369993" target="_blank" >RIV/00216208:11320/18:10369993 - isvavai.cz</a>

Alternative codes found

RIV/68378271:_____/18:00500472

Result on the web

<a href="http://dx.doi.org/10.1103/PhysRevMaterials.2.014401" target="_blank" >http://dx.doi.org/10.1103/PhysRevMaterials.2.014401</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevMaterials.2.014401" target="_blank" >10.1103/PhysRevMaterials.2.014401</a>

Result language

angličtina

Original language name

Chemical disorder and Pb-207 hyperfine fields in the magnetoelectric multiferroic Pb(Fe1/2Sb1/2)O-3 and its solid solution with Pb(Fe1/2Nb1/2)O-3

Original language description

We report on the results of magnetic susceptibility, electron paramagnetic resonance, and Pb-207 nuclear magnetic resonance (NMR) studies of themagnetoelectric multiferroic Pb(Fe1/2Sb1/2)O-3 (PFS) ceramic, as well as its solid solution with Pb(Fe1/2Nb1/2)O-3 (PFN) of different degrees of the 1: 1 ordering of magnetic Fe3+ and nonmagnetic Sb5+ ions. The ordering has been studied by x-ray diffraction (XRD) and NMR methods. In particular, two spectral lines, originating from the ordered and disordered regions, respectively, are resolved in the Pb-207 NMR spectra. This demonstrates the presence of spatially heterogeneous ordering where ordered regions are embedded into a disordered matrix. Combining XRD and NMR data, we have determined both the long-range order parameter s and the volume fraction of ordered regions s&apos; for all investigated samples. The values vary in the range s = 0-0.93 and s&apos; = 0-1. We have found that the Pb-207 Fermi contact interaction strongly depends on the disorder in the Fe/Sb positions: whereas it reaches 7.08 MHz in the ordered lattice, it is almost zero in the disordered environment. These results are further supported by the studies of PFS-PFN solid solutions. The analysis of experimental data in terms of density functional theory reveals a noticeably higher hybridization between Pb 6s and Fe 3d orbitals in the ordered case. The ordering of magnetic and nonmagnetic ions has a strong impact on the magnetic properties of PFS, leading to a transformation of the long-range ordered antiferromagnetic phase in chemically ordered samples to the spin glass state already in partially (s = 0.35) disordered specimens. In our opinion, the difference in the magnetic properties of PFN and PFS is related to the fact that PFN is completely disordered, in contrast to PFS, which is only partially disordered, with small ordered regions existing in the disordered matrix that prevent the percolation of the nearest-neighbor Fe-Fe exchange interaction across the lattice.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physical Review Materials

ISSN

2475-9953

e-ISSN

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Volume of the periodical

2

Issue of the periodical within the volume

1

Country of publishing house

US - UNITED STATES

Number of pages

13

Pages from-to

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UT code for WoS article

000419720300002

EID of the result in the Scopus database

2-s2.0-85052577684