تقرير
Realization of Z$_2$ Topological Metal in Single-Crystalline Nickel Deficient NiV$_2$Se$_4$
| العنوان: | Realization of Z$_2$ Topological Metal in Single-Crystalline Nickel Deficient NiV$_2$Se$_4$ |
|---|---|
| المؤلفون: | Ramakrishnan, Sitaram, Matteppanavar, Shidaling, Schonleber, Andreas, Patra, Bikash, Singh, Birender, Thamizhavel, Arumugam, Singh, Bahadur, Ramakrishnan, Srinivasan, van Smaalen, Sander |
| المصدر: | Ann. Phys. (Berl) 2023 |
| سنة النشر: | 2023 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons |
| الوصف: | Temperature-dependent electronic and magnetic properties are reported for a Z2 topological metal single-crystalline nickel-deficient NiV$_2$Se$_4$. It is found to crystallize in the monoclinic Cr3S4 structure type with space group I2=m. From single-crystal x-ray diffraction, we find that there are vacancies on the Ni site, resulting in the composition Ni0:85V2Se4 in agreement with our electron-probe microanalysis. The electrical resistivity shows metallic behavior with a broad anomaly around 150{200 K that is also observed in the heat capacity data. This anomaly indicates a change of state of the material below 150 K. We believe that this anomaly could be due to spin fluctuations or charge-density-wave (CDW) fluctuations, where the lack of long-range order is caused by vacancies at the Ni site of Ni0:85V2Se4. Although we fail to observe any structural distortion in this crystal down to 1.5 K, its electronic and thermal properties are anomalous. The observation of non-linear temperature dependence of resistivity as well as an enhanced value of the Sommerfeld coefficient = 104.0(1) mJ/molK2 suggests strong electron-electron correlations in this material. The first-principles calculations performed for NiV$_2$Se$_4$, which are also applicable to Ni0:85V2Se4, classify this material as a topological metal with Z2 = (1; 110) and coexisting electron and hole pockets at the Fermi level. The phonon spectrum lacks any soft phonon mode, consistent with the absence of periodic lattice distortion in the present experiments. Comment: arXiv admin note: text overlap with arXiv:cond-mat/0610166 by other authors |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1002/andp.202200611 |
| URL الوصول: | http://arxiv.org/abs/2304.09357 |
| رقم الأكسشن: | edsarx.2304.09357 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1002/andp.202200611 |
|---|