2016年7月29日
Stress-induced magnetic domain selection reveals a conical ground state for the multiferroic phase ofMn2GeO4
Physical Review B
- ,
- ,
- ,
- ,
- ,
- ,
- ,
- ,
- 巻
- 94
- 号
- 2
- 開始ページ
- 024439
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/physrevb.94.024439
- 出版者・発行元
- American Physical Society (APS)
At ambient pressure P and below 5.5 K, olivine-type Mn2GeO4 hosts a multiferroic (MF) phase where a multicomponent, i.e., multi-k magnetic order generates spontaneous ferromagnetism and ferroelectricity (FE) along the c axis. Under high P the FE disappears above 6 GPa, yet the P evolution of the magnetic structure remained unclear based on available data. Here we report high-P single crystal neutron diffraction experiments in the MF phase at T=4.5 K. We observe clearly that the incommensurate spiral component of the magnetic order responsible for FE varies little with P up to 5.1 GPa. With support from high P synchrotron x-ray diffraction measurements at room temperature (T), the P-driven suppression of FE is proposed to occur as a consequence of a crystal structure transition away from the olivine structure. In addition, in the low T neutron scattering experiments an emergent nonhydrostatic P component, i.e., a uniaxial stress, leads to the selection of certain multi-k domains. We use this observation to deduce a double-k conical magnetic structure for the ambient P ground state, this being a key ingredient for a model description of the MF phase.
- リンク情報
-
- DOI
- https://doi.org/10.1103/physrevb.94.024439
- arXiv
- http://arxiv.org/abs/arXiv:1608.00823
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000381481300004&DestApp=WOS_CPL
- 共同研究・競争的資金等の研究課題
- オリビン型遷移金属酸化物における新規電子物性の創成及びその解明
- URL
- http://link.aps.org/article/10.1103/PhysRevB.94.024439
- URL
- http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.94.024439/fulltext
- Scopus
- https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84982676259&origin=inward
- Scopus Citedby
- https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=84982676259&origin=inward
- ID情報
-
- DOI : 10.1103/physrevb.94.024439
- ISSN : 2469-9950
- eISSN : 2469-9969
- arXiv ID : arXiv:1608.00823
- SCOPUS ID : 84982676259
- Web of Science ID : WOS:000381481300004