Comment on ``Strain effect and the phase diagram of La$_{1-x}$Ba$_x$MnO$_3$ thin films''
| dc.creator | Yuan, Qingshan | |
| dc.date | 2001-12-28 | |
| dc.date | 2004-07-09 | |
| dc.date.accessioned | 2026-07-07T02:43:58Z | |
| dc.date.available | 2026-07-07T02:43:58Z | |
| dc.description | Recent experiments in La$_{1-x}$Ba$_x$MnO$_3$ thin films by Zhang {\it et al.} {[Phys. Rev. B {\bf 64}, 184404 (2001)]} showed that the ferromagnetic Curie temperature $T_c$ is enhanced (reduced) by tensile (compressive) strain. The results are regarded to be anomalous because it is generally understood by the authors that the tensile strain should lead to a reduction of the electron hopping $t$ (and thus also $T_c$) due to an elongation of the (in-plane) Mn-O bond length. In this comment such a general understanding of the strain effects is disapproved. It is argued that the tensile strain leads primarily to a larger Mn-O-Mn bond angle (with the Mn-O bond length nearly unchanged), thus the pure geometric consideration on $t$ is already in the correct direction towards the experimental findings by Zhang {\it et al.} At the same time, an indirect strain effect under consideration of the dynamic electron-phonon coupling is proposed, which may improve the quantitative explanation. | |
| dc.description | 3 pages, no figures. final version after minor changes, to appear in Phys. Rev. B (2004) | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0112480 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0112480 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/18725 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.subject | Materials Science | |
| dc.title | Comment on ``Strain effect and the phase diagram of La$_{1-x}$Ba$_x$MnO$_3$ thin films'' | |
| dc.type | text |