التفاصيل البيبلوغرافية
| العنوان: |
Ordering of hidden multipoles in spin-orbital entangled 5$d^{1}$ Ta chlorides |
| المؤلفون: |
Ishikawa, Hajime, Takayama, Tomohiro, Kremer, Reinhard K., Nuss, Jürgen, Dinnebier, Robert, Kitagawa, Kentaro, Ishii, Kenji, Takagi, Hidenori |
| المصدر: |
Phys. Rev. B 100, 045142 (2019) |
| سنة النشر: |
2018 |
| المجموعة: |
Condensed Matter |
| مصطلحات موضوعية: |
Condensed Matter - Strongly Correlated Electrons |
| الوصف: |
Spin-orbit coupling of as large as a half eV for electrons in 5$d$ orbitals often gives rise to the formation of spin-orbital entangled objects, characterized by the effective total angular momentum $J_{eff}$. Of particular interest are the $J_{eff}$ = 3/2 states realized in 5$d^{1}$ transition metal ions surrounded by an anion octahedron. The pure $J_{eff}$ = 3/2 quartet does not have any magnetic dipolar moment (<$M$> = 0) but hosts hidden pseudo-dipolar moments accompanied by charge quadrupoles and magnetic octupoles. Cs$_2$TaCl$_6$ and Rb$_2$TaCl$_6$ are correlated insulators with 5$d^{1}$ Ta$^{4+}$ ions in a regular Cl octahedron. Here we demonstrate that these Ta chlorides have a substantially suppressed effective magnetic dipolar moment of ~ 0.2 ${\mu}_B$. Two phase transitions are observed at low temperatures that are not pronounced in the magnetization but accompanied with large electronic entropy of $R$ln4. We ascribe the two transitions to the ordering of hidden multipoles. |
| نوع الوثيقة: |
Working Paper |
| DOI: |
10.1103/PhysRevB.100.045142 |
| URL الوصول: |
http://arxiv.org/abs/1807.08311 |
| رقم الانضمام: |
edsarx.1807.08311 |
| قاعدة البيانات: |
arXiv |