2017 Fiscal Year Research-status Report
Transport and Thermodynamics in Topological Materials
| Project/Area Number |
15K05140
|
|---|
| Research Institution | Institute of Physical and Chemical Research |
|---|
Principal Investigator |
Kriener Markus 国立研究開発法人理化学研究所, 創発物性科学研究センター, 研究員 (60447919)
|
|---|
| Project Period (FY) |
2015-04-01 – 2019-03-31
|
| Keywords | Superconductivity / Polar Semiconductors / Topological Insulators / Topol. Supeconductors / Weyl Semimetals |
|---|
| Outline of Annual Research Achievements |
GeTe project: The study on the ferromagnetic phase induced by Mn-doping on the Ge site has been finished and the results were published. The focus was shifted on a collaboration on the closely related topological crystalline insulator SnTe where Indium doping induces superconductivity. So far the superconducting phase diagram was only known up to In concentrations of approx. 45-50% since for higher Indium levels a structural phase transition takes places and superconductivity is lost. By employing a high-pressure synthesis method we successfully grew the whole solid solution up to InTe enabling us to map out the complete phase diagram. An interesting and unexpected two-dome structure of the superconducting phase diagram was revealed. Motivated by theoretical calculations, codoping Se at the Te site was also attempted and Tc was further enhanced. As a possible mechanism the valence-skipping nature of Indium was cinsidered. These results were written up and the paper has been published recently (the first three authors contributed equally to this project). Meanwhile two more collaborations were started focussing on this system (ongoing).
Cd3As2 project: Two collaborations are ongoing. One on the topological aspects of the pure and Zn-doped system lead to four publications with two being published and one accepted for publication. The second collaboration on this system faced some experimental problems and is currently pending.
|
| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The high-pressure synthesis conditions for the targeted doped semiconductor GeTe were successfully established and sample preparation is under control. Also single-crystal preparation on low-In-doped SnTe has worked out well leading to a new collaboration on this system where among others the possible topological nature of this doped system is examined.
|
| Strategy for Future Research Activity |
I also started to address In-doping into GeTe. This system was also found to become superconducting. Interestingly the system behaves very different as compared to In-doped SnTe. This project is ongoing, a first publication is in preparation.
|
| Causes of Carryover |
The remaining money will be used to attend an international conference where research resulty obtained under this project will be presented. In addition a software program will be purchased to be used under this project.
|
-
-
-
[Journal Article] J1-J2 square lattice antiferromagnetism in the orbitally quenched insulator MoOPO42017
Author(s)
L. Yang, M. Jeong, P. Babkevich, V. M. Katukuri, B. Nafradi, N. E. Shaik, A. Magrez, H. Berger, J. Schefer, E. Ressouche, M. Kriener, I. Zivkovic, O. V. Yazyev, L. Forro; and H. M. Ronnow
-
Journal Title
Physical Review B
Volume: 96
Pages: 024445-1 -8
DOI
Peer Reviewed / Int'l Joint Research
-
[Journal Article] Quantum Hall states in thin films of Dirac semimetal Cd3As22017
Author(s)
M. Uchida, Y. Nakazawa, S. Nishihaya, K. Akiba, M. Kriener, Y. Kozuka, A. Miyake, Y. Taguchi, M. Tokunaga, N. Nagaosa, Y. Tokura, and M. Kawasaki
-
Journal Title
Nature Communications
Volume: 8
Pages: 2274-1 2274-7
DOI
Peer Reviewed / Open Access / Int'l Joint Research
-
-
-
-
-
-
