AI Article Synopsis
- The study investigates the origin of nematicity in FeSe, which is important for understanding unconventional superconductivity related to nematic order.
- Researchers used X-ray linear dichroism to analyze the 3d orbital occupancy changes under different stress and temperature conditions during the nematic transition.
- The findings suggest that spontaneous orbital polarization acts as the key order parameter in the nematic phase, independent of structural distortions.
Article Abstract
The origin of nematicity in FeSe remains a critical outstanding question towards understanding unconventional superconductivity in proximity to nematic order. To understand what drives the nematicity, it is essential to determine which electronic degree of freedom admits a spontaneous order parameter independent from the structural distortion. Here we use X-ray linear dichroism at the Fe K pre-edge to measure the anisotropy of the 3d orbital occupation as a function of in situ applied stress and temperature across the nematic transition. Along with using X-ray diffraction to precisely quantify the strain state, we reveal a lattice-independent, spontaneously ordered orbital polarization within the nematic phase, as well as an orbital polarizability that diverges as the transition is approached from above. These results provide strong evidence that spontaneous orbital polarization serves as the primary order parameter of the nematic phase.
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| http://dx.doi.org/10.1038/s41563-023-01585-2 | DOI Listing |
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