4 research outputs found
Honeycomb oxide heterostructure: a new platform for Kitaev quantum spin liquid
Kitaev quantum spin liquid, massively quantum entangled states, is so scarce
in nature that searching for new candidate systems remains a great challenge.
Honeycomb heterostructure could be a promising route to realize and utilize
such an exotic quantum phase by providing additional controllability of
Hamiltonian and device compatibility, respectively. Here, we provide epitaxial
honeycomb oxide thin film Na3Co2SbO6, a candidate of Kitaev quantum spin liquid
proposed recently. We found a spin glass and antiferromagnetic ground states
depending on Na stoichiometry, signifying not only the importance of Na vacancy
control but also strong frustration in Na3Co2SbO6. Despite its classical ground
state, the field-dependent magnetic susceptibility shows remarkable scaling
collapse with a single critical exponent, which can be interpreted as evidence
of quantum criticality. Its electronic ground state and derived spin
Hamiltonian from spectroscopies are consistent with the predicted Kitaev model.
Our work provides a unique route to the realization and utilization of Kitaev
quantum spin liquid
Preparation of large Cu3Sn single crystal by Czochralski method
Cu3Sn was recently predicted to host topological Dirac fermions, but related research is still in its infancy. The growth of large and high-quality Cu3Sn single crystals is, therefore, highly desired to investigate the possible topological properties. In this work, we report the single crystal growth of Cu3Sn by Czochralski (CZ) method. Crystal structure, chemical composition, and transport properties of Cu3Sn single crystals were analyzed to verify the crystal quality. Notably, compared to the mm-sized crystals from a molten Sn flux, the cm-sized crystals obtained by the CZ method are free from contamination from flux materials, paving the way for the follow-up works
Preparation of large Cu3Sn single crystal by Czochralski method
Cu3Sn was recently predicted to host topological Dirac fermions, but related
research is still in its infancy. The growth of large and high-quality Cu3Sn
single crystals is, therefore, highly desired to investigate the possible
topological properties. In this work, we report the single crystal growth of
Cu3Sn by Czochralski (CZ) method. Crystal structure, chemical composition, and
transport properties of Cu3Sn single crystals were analyzed to verify the
crystal quality. Notably, compared to the mm-sized crystals from a molten
Sn-flux, the cm-sized crystals obtained by the CZ method are free from
contamination from flux materials, paving the way for the follow-up works
Extended Oxygen Octahedral Tilt Proximity near Oxide Heterostructures
The
oxide interfaces between materials with different
structural
symmetries have been actively studied due to their novel physical
properties. However, the investigation of intriguing interfacial phenomena
caused by the oxygen octahedral tilt (OOT) proximity effect has not
been fully exploited, as there is still no clear understanding of
what determines the proximity length and what the underlying control
mechanism is. Here, we achieved scalability of the OOT proximity effect
in SrRuO3 (SRO) by epitaxial strain near the SRO/SrTiO3 heterointerface. We demonstrated that the OOT proximity length
scale of SRO is extended from 4 unit cells to 14 unit cells by employing
advanced scanning transmission electron microscopy. We also suggest
that this variation may originate from changes in phonon dispersions
due to electron–phonon coupling in SRO. This study will provide
in-depth insights into the structural gradients of correlated systems
and facilitate potential device applications