by C. Frontera, J. L. García-Muñoz, A. E. Carrillo, A. Caneiro, C. Ritter and D. Martín y Marero
Abstract:
This work presents an investigation of the central role of oxygen on the physical properties of highly ordered layered cobaltites. It includes the study of the structural and magnetic properties of PrBaCo2O5+δPrBaCo2O5+δtextlessmath display=”inline” overflow=”scroll” altimg=”eq-00003.gif”textgreatertextlessmrowtextgreatertextlessmi mathvariant=”normal”textgreaterPrtextless/mitextgreatertextlessmi mathvariant=”normal”textgreaterBatextless/mitextgreatertextlessmsubtextgreatertextlessmi mathvariant=”normal”textgreaterCotextless/mitextgreatertextlessmntextgreater2textless/mntextgreatertextless/msubtextgreatertextlessmsubtextgreatertextlessmi mathvariant=”normal”textgreaterOtextless/mitextgreatertextlessmrowtextgreatertextlessmntextgreater5textless/mntextgreatertextlessmotextgreater+textless/motextgreatertextlessmitextgreaterδtextless/mitextgreatertextless/mrowtextgreatertextless/msubtextgreatertextless/mrowtextgreatertextless/mathtextgreater compounds with high oxygen content (0.5⩽δ⩽0.90)(0.5⩽δ⩽0.90)textlessmath display=”inline” overflow=”scroll” altimg=”eq-00004.gif”textgreatertextlessmrowtextgreatertextlessmotextgreater(textless/motextgreatertextlessmntextgreater0.5textless/mntextgreatertextlessmotextgreater⩽textless/motextgreatertextlessmitextgreaterδtextless/mitextgreatertextlessmotextgreater⩽textless/motextgreatertextlessmntextgreater0.90textless/mntextgreatertextlessmotextgreater)textless/motextgreatertextless/mrowtextgreatertextless/mathtextgreater, with special emphasis on PrBaCo2O5.75PrBaCo2O5.75textlessmath display=”inline” overflow=”scroll” altimg=”eq-00005.gif”textgreatertextlessmrowtextgreatertextlessmi mathvariant=”normal”textgreaterPrtextless/mitextgreatertextlessmi mathvariant=”normal”textgreaterBatextless/mitextgreatertextlessmsubtextgreatertextlessmi mathvariant=”normal”textgreaterCotextless/mitextgreatertextlessmntextgreater2textless/mntextgreatertextless/msubtextgreatertextlessmsubtextgreatertextlessmi mathvariant=”normal”textgreaterOtextless/mitextgreatertextlessmntextgreater5.75textless/mntextgreatertextless/msubtextgreatertextless/mrowtextgreatertextless/mathtextgreater. For δ=0.75δ=0.75textlessmath display=”inline” overflow=”scroll” altimg=”eq-00006.gif”textgreatertextlessmrowtextgreatertextlessmitextgreaterδtextless/mitextgreatertextlessmotextgreater=textless/motextgreatertextlessmntextgreater0.75textless/mntextgreatertextless/mrowtextgreatertextless/mathtextgreater the ordering of oxygen vacancies gives rise to a tetragonal (P4∕mmm)(P4∕mmm)textlessmath display=”inline” overflow=”scroll” altimg=”eq-00007.gif”textgreatertextlessmrowtextgreatertextlessmotextgreater(textless/motextgreatertextlessmitextgreaterPtextless/mitextgreatertextlessmntextgreater4textless/mntextgreatertextlessmotextgreater∕textless/motextgreatertextlessmitextgreatermtextless/mitextgreatertextlessmitextgreatermtextless/mitextgreatertextlessmitextgreatermtextless/mitextgreatertextlessmotextgreater)textless/motextgreatertextless/mrowtextgreatertextless/mathtextgreater structure with a≈c≈2apa≈c≈2aptextlessmath display=”inline” overflow=”scroll” altimg=”eq-00008.gif”textgreatertextlessmrowtextgreatertextlessmitextgreateratextless/mitextgreatertextlessmotextgreater≈textless/motextgreatertextlessmitextgreaterctextless/mitextgreatertextlessmotextgreater≈textless/motextgreatertextlessmntextgreater2textless/mntextgreatertextlessmsubtextgreatertextlessmitextgreateratextless/mitextgreatertextlessmi mathvariant=”normal”textgreaterptextless/mitextgreatertextless/msubtextgreatertextless/mrowtextgreatertextless/mathtextgreater. On cooling, a ferromagnetic spin alignment precedes the apparition of antiferromagnetic order (canted G-type). The compounds are ferromagnetic for δ⩾0.80δ⩾0.80textlessmath display=”inline” overflow=”scroll” altimg=”eq-00009.gif”textgreatertextlessmrowtextgreatertextlessmitextgreaterδtextless/mitextgreatertextlessmotextgreater⩾textless/motextgreatertextlessmntextgreater0.80textless/mntextgreatertextless/mrowtextgreatertextless/mathtextgreater. Measurements on PrBaCo2O5.75PrBaCo2O5.75textlessmath display=”inline” overflow=”scroll” altimg=”eq-00010.gif”textgreatertextlessmrowtextgreatertextlessmi mathvariant=”normal”textgreaterPrtextless/mitextgreatertextlessmi mathvariant=”normal”textgreaterBatextless/mitextgreatertextlessmsubtextgreatertextlessmi mathvariant=”normal”textgreaterCotextless/mitextgreatertextlessmntextgreater2textless/mntextgreatertextless/msubtextgreatertextlessmsubtextgreatertextlessmi mathvariant=”normal”textgreaterOtextless/mitextgreatertextlessmntextgreater5.75textless/mntextgreatertextless/msubtextgreatertextless/mrowtextgreatertextless/mathtextgreater support that, above the magnetic ordering temperature, Co3+Co3+textlessmath display=”inline” overflow=”scroll” altimg=”eq-00011.gif”textgreatertextlessmsuptextgreatertextlessmi mathvariant=”normal”textgreaterCotextless/mitextgreatertextlessmrowtextgreatertextlessmntextgreater3textless/mntextgreatertextlessmotextgreater+textless/motextgreatertextless/mrowtextgreatertextless/msuptextgreatertextless/mathtextgreater ions in octahedral environment are in HS state.
Reference:
C. Frontera, J. L. García-Muñoz, A. E. Carrillo, A. Caneiro, C. Ritter and D. Martín y Marero, “Magnetism and vacancy ordering in PrBaCo2O5+δ (δ⩾0.50)”, Journal of Applied Physics, vol. 97, no. 10, pp. 10C106.
Bibtex Entry:
@article{frontera_magnetism_2005,
title = {Magnetism and vacancy ordering in {PrBaCo2O5}+δ (δ⩾0.50)},
volume = {97},
issn = {0021-8979},
url = {http://aip.scitation.org/doi/10.1063/1.1855017},
doi = {10.1063/1.1855017},
abstract = {This work presents an investigation of the central role of oxygen on the physical properties of highly ordered layered cobaltites. It includes the study of the structural and magnetic properties of PrBaCo2O5+δPrBaCo2O5+δ{textless}math display="inline" overflow="scroll" altimg="eq-00003.gif"{textgreater}{textless}mrow{textgreater}{textless}mi mathvariant="normal"{textgreater}Pr{textless}/mi{textgreater}{textless}mi mathvariant="normal"{textgreater}Ba{textless}/mi{textgreater}{textless}msub{textgreater}{textless}mi mathvariant="normal"{textgreater}Co{textless}/mi{textgreater}{textless}mn{textgreater}2{textless}/mn{textgreater}{textless}/msub{textgreater}{textless}msub{textgreater}{textless}mi mathvariant="normal"{textgreater}O{textless}/mi{textgreater}{textless}mrow{textgreater}{textless}mn{textgreater}5{textless}/mn{textgreater}{textless}mo{textgreater}+{textless}/mo{textgreater}{textless}mi{textgreater}δ{textless}/mi{textgreater}{textless}/mrow{textgreater}{textless}/msub{textgreater}{textless}/mrow{textgreater}{textless}/math{textgreater} compounds with high oxygen content (0.5⩽δ⩽0.90)(0.5⩽δ⩽0.90){textless}math display="inline" overflow="scroll" altimg="eq-00004.gif"{textgreater}{textless}mrow{textgreater}{textless}mo{textgreater}({textless}/mo{textgreater}{textless}mn{textgreater}0.5{textless}/mn{textgreater}{textless}mo{textgreater}⩽{textless}/mo{textgreater}{textless}mi{textgreater}δ{textless}/mi{textgreater}{textless}mo{textgreater}⩽{textless}/mo{textgreater}{textless}mn{textgreater}0.90{textless}/mn{textgreater}{textless}mo{textgreater}){textless}/mo{textgreater}{textless}/mrow{textgreater}{textless}/math{textgreater}, with special emphasis on PrBaCo2O5.75PrBaCo2O5.75{textless}math display="inline" overflow="scroll" altimg="eq-00005.gif"{textgreater}{textless}mrow{textgreater}{textless}mi mathvariant="normal"{textgreater}Pr{textless}/mi{textgreater}{textless}mi mathvariant="normal"{textgreater}Ba{textless}/mi{textgreater}{textless}msub{textgreater}{textless}mi mathvariant="normal"{textgreater}Co{textless}/mi{textgreater}{textless}mn{textgreater}2{textless}/mn{textgreater}{textless}/msub{textgreater}{textless}msub{textgreater}{textless}mi mathvariant="normal"{textgreater}O{textless}/mi{textgreater}{textless}mn{textgreater}5.75{textless}/mn{textgreater}{textless}/msub{textgreater}{textless}/mrow{textgreater}{textless}/math{textgreater}. For δ=0.75δ=0.75{textless}math display="inline" overflow="scroll" altimg="eq-00006.gif"{textgreater}{textless}mrow{textgreater}{textless}mi{textgreater}δ{textless}/mi{textgreater}{textless}mo{textgreater}={textless}/mo{textgreater}{textless}mn{textgreater}0.75{textless}/mn{textgreater}{textless}/mrow{textgreater}{textless}/math{textgreater} the ordering of oxygen vacancies gives rise to a tetragonal (P4∕mmm)(P4∕mmm){textless}math display="inline" overflow="scroll" altimg="eq-00007.gif"{textgreater}{textless}mrow{textgreater}{textless}mo{textgreater}({textless}/mo{textgreater}{textless}mi{textgreater}P{textless}/mi{textgreater}{textless}mn{textgreater}4{textless}/mn{textgreater}{textless}mo{textgreater}∕{textless}/mo{textgreater}{textless}mi{textgreater}m{textless}/mi{textgreater}{textless}mi{textgreater}m{textless}/mi{textgreater}{textless}mi{textgreater}m{textless}/mi{textgreater}{textless}mo{textgreater}){textless}/mo{textgreater}{textless}/mrow{textgreater}{textless}/math{textgreater} structure with a≈c≈2apa≈c≈2ap{textless}math display="inline" overflow="scroll" altimg="eq-00008.gif"{textgreater}{textless}mrow{textgreater}{textless}mi{textgreater}a{textless}/mi{textgreater}{textless}mo{textgreater}≈{textless}/mo{textgreater}{textless}mi{textgreater}c{textless}/mi{textgreater}{textless}mo{textgreater}≈{textless}/mo{textgreater}{textless}mn{textgreater}2{textless}/mn{textgreater}{textless}msub{textgreater}{textless}mi{textgreater}a{textless}/mi{textgreater}{textless}mi mathvariant="normal"{textgreater}p{textless}/mi{textgreater}{textless}/msub{textgreater}{textless}/mrow{textgreater}{textless}/math{textgreater}. On cooling, a ferromagnetic spin alignment precedes the apparition of antiferromagnetic order (canted G-type). The compounds are ferromagnetic for δ⩾0.80δ⩾0.80{textless}math display="inline" overflow="scroll" altimg="eq-00009.gif"{textgreater}{textless}mrow{textgreater}{textless}mi{textgreater}δ{textless}/mi{textgreater}{textless}mo{textgreater}⩾{textless}/mo{textgreater}{textless}mn{textgreater}0.80{textless}/mn{textgreater}{textless}/mrow{textgreater}{textless}/math{textgreater}. Measurements on PrBaCo2O5.75PrBaCo2O5.75{textless}math display="inline" overflow="scroll" altimg="eq-00010.gif"{textgreater}{textless}mrow{textgreater}{textless}mi mathvariant="normal"{textgreater}Pr{textless}/mi{textgreater}{textless}mi mathvariant="normal"{textgreater}Ba{textless}/mi{textgreater}{textless}msub{textgreater}{textless}mi mathvariant="normal"{textgreater}Co{textless}/mi{textgreater}{textless}mn{textgreater}2{textless}/mn{textgreater}{textless}/msub{textgreater}{textless}msub{textgreater}{textless}mi mathvariant="normal"{textgreater}O{textless}/mi{textgreater}{textless}mn{textgreater}5.75{textless}/mn{textgreater}{textless}/msub{textgreater}{textless}/mrow{textgreater}{textless}/math{textgreater} support that, above the magnetic ordering temperature, Co3+Co3+{textless}math display="inline" overflow="scroll" altimg="eq-00011.gif"{textgreater}{textless}msup{textgreater}{textless}mi mathvariant="normal"{textgreater}Co{textless}/mi{textgreater}{textless}mrow{textgreater}{textless}mn{textgreater}3{textless}/mn{textgreater}{textless}mo{textgreater}+{textless}/mo{textgreater}{textless}/mrow{textgreater}{textless}/msup{textgreater}{textless}/math{textgreater} ions in octahedral environment are in HS state.},
number = {10},
urldate = {2017-07-21},
journal = {Journal of Applied Physics},
author = {Frontera, C. and García-Muñoz, J. L. and Carrillo, A. E. and Caneiro, A. and Ritter, C. and Martín y Marero, D.},
month = may,
year = {2005},
pages = {10C106},
file = {Full Text PDF:E:\cmam_papers\files\446\Frontera et al. - 2005 - Magnetism and vacancy ordering in PrBaCo2O5+δ (δ⩾0.pdf:application/pdf;Full Text PDF:E:\Usuarios\Administrator\Zotero\storage\BVAXUHRA\Frontera et al. - 2005 - Magnetism and vacancy ordering in PrBaCo2O5+δ (δ⩾0.pdf:application/pdf;Snapshot:E:\cmam_papers\files\447\1.html:text/html;Snapshot:E:\Usuarios\Administrator\Zotero\storage\5UILB258\1.html:text/html},
}