Structural anomalies and short-range magnetic correlations in the orbitally degenerate systemSr2VO4
| Autor: | Masashi Takigawa, Ryosuke Kadono, M. Hiraishi, Kazuyoshi Yoshimura, Youichi Murakami, Kazuhiro Nawa, Hiroaki Ueda, Hironori Nakao, Akihiro Koda, M. Miyazaki, Kenji M. Kojima, Reiji Kumai, Ichihiro Yamauchi |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Physics
Condensed matter physics Order (ring theory) Muon spin spectroscopy Condensed Matter Physics Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Tetragonal crystal system Ferromagnetism Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Orthorhombic crystal system Ground state Perovskite (structure) |
| Zdroj: | Physical Review B. 92 |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.92.064408 |
| Popis: | We report on the electronic ground state of a layered perovskite vanadium oxide ${\mathrm{Sr}}_{2}{\mathrm{VO}}_{4}$ studied by the combined use of synchrotron radiation x-ray diffraction (SR-XRD) and muon spin rotation/relaxation $(\ensuremath{\mu}\mathrm{SR})$ techniques, where $\ensuremath{\mu}\mathrm{SR}$ measurements were extended down to 30 mK. We found an intermediate orthorhombic phase between ${T}_{\mathrm{c}2}\ensuremath{\sim}130$ K and ${T}_{\mathrm{c}1}\ensuremath{\sim}100$ K, whereas a tetragonal phase appears for $Tg{T}_{\mathrm{c}2}$ and $Tl{T}_{\mathrm{c}1}$. The absence of long-range magnetic order was confirmed by $\ensuremath{\mu}\mathrm{SR}$ at the reentrant tetragonal phase below ${T}_{\mathrm{c}1}$, where the relative enhancement in the $c$-axis length versus that of the $a$-axis length was observed. However, no clear indication of the lowering of the tetragonal lattice symmetry with superlattice modulation, which is expected in the orbital order state with superstructure of ${d}_{yz}$ and ${d}_{zx}$ orbitals, was observed by SR-XRD below ${T}_{\mathrm{c}1}$. Instead, it was inferred from $\ensuremath{\mu}\mathrm{SR}$ that a magnetic state developed below ${T}_{\mathrm{c}0}\ensuremath{\sim}10$ K, which was characterized by the highly inhomogeneous and fluctuating local magnetic fields down to 30 mK. We argue that the anomalous magnetic ground state below ${T}_{\mathrm{c}0}$ originates from the coexistence of ferromagnetic and antiferromagnetic correlations. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|