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LASSP & AEP Seminar - Jiun-Haw Chu - University of Washington

Tuesday, October 27, 2020 at 12:20pm

Virtual Event

Hosted by Brad Ramshaw

Title: Nematic Quantum Criticality in Iron-Based Superconductors

Abstract: Electronic nematicity refers to a self-organized electronic state that breaks rotational symmetry without long range translational order. In the iron-based superconductors, the nematic transition temperature can be continuously tuned by doping and pressure, which extrapolates to zero as the superconducting Tc is tuned to optimal. In this talk, I will present two striking phenomena associated with this putative nematic quantum critical point. First, we discovered that the superconductivity is extremely sensitive to the anisotropic strain near optimal doping – the Tc is reduced by five-fold under less than a percent anisotropic strain [1]. Second, using the combination of precision detwinning and elastoresistivity measurements, we found that the ratio between resistivity anisotropy and structural orthorhombicity within the nematic ordered phase enhances by fourfold as the doping approaches optimal, suggesting that the conduction electrons become increasingly sensitive to the lattice even as the nematic order is suppressed [2].
[1] Paul Malinowski, Qianni Jiang, Joshua Sanchez, Zhaoyu Liu, Joshua Mutch, Preston Went, Jian Liu, Philip Ryan, Jong-Woo Kim, Jiun-Haw Chu, “Drastic suppression of superconducting Tc  by anisotropic strain near a nematic quantum critical point”, arXiv:1911.03390 (Nature Physics, 2020)
[2] Joshua J Sanchez, Paul Malinowski, Joshua Mutch, Jian Liu, J-W. Kim, Philip J Ryan, Jiun-Haw Chu, “The spontaneous elastoresistivity coefficient within the nematic ordered phase of iron pnictides”, arXiv:2006.09444v2

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Event Type



LASSP, Applied and Engineering Physics


lassp_and_aep_seminar, lassp

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Contact Name

Lea Reagan

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Jiun-Haw Chu

Speaker Affiliation

University of Washington

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