Study on the oxygen isotope effect in A-site ordered manganite $R$BaMn$_{2}$O$_{6}$ ($R$ = La, Pr, Nd, Sm)
| dc.creator | Wang, G. Y. | |
| dc.creator | Wong, K. H. | |
| dc.creator | Wang, Y. | |
| dc.date | 2009-04-23 | |
| dc.date.accessioned | 2026-07-07T13:08:23Z | |
| dc.date.available | 2026-07-07T13:08:23Z | |
| dc.description | A-site ordered manganites $R$BaMn$_{2}$O$_{6}$ ($R$ = La, Pr, Nd, Sm) were synthesized and the oxygen isotope effect in them was studied. It was found that the substitution of $^{16}$O by $^{18}$O has caused increases in both the Neel temperature ($T$$_{N}$) and the charge ordering temperature ($T$$_{CO}$) and an decrease in the Curie temperature ($T$$_{C}$). The isotope exponent is small on $T$$_{C}$ and $T$$_{CO}$ compared with that in A-site disordered manganites such as La$_{1-x}$Ca$_{x}$MnO$_{3}$, which may be caused by weaker electron-phonon coupling in A-site ordered ones. But the isotope exponent of $T$$_{N}$ is large for $R$ = La. We didn't observe the large oxygen-isotope shift that occurs in NdBaMn$_{2}$O$_{6}$, where a multicritical point is believed to appear near $R$ = Nd, and strong fluctuation due to the competition between ferromagnetic metal and charge ordering phase should be present. | |
| dc.description | 5 pages, 4 figures | |
| dc.identifier | https://arxiv.org/abs/0904.3766 | |
| dc.identifier | http://arxiv.org/abs/0904.3766 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/228403 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.subject | Materials Science | |
| dc.title | Study on the oxygen isotope effect in A-site ordered manganite $R$BaMn$_{2}$O$_{6}$ ($R$ = La, Pr, Nd, Sm) | |
| dc.type | text |