Nematic fluctuations in iron-oxychalcogenide Mott insulators
- Univ. of Houston, TX (United States); Univ. of Louisville, KY (United States)
- Technical Univ. Dresden (Germany)
- Technical Univ. Dresden (Germany); Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany)
- King's College, London (United Kingdom)
- Inst. of Mathematical Science, Chennai (India); Homi Bhabha National Inst. Training School Complex, Mumbai (India)
- Federal Univ. of Mato Grosso (UFMT), Cuiabá (Brazil); Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany)
- Atomic Energy of Canada Ltd., Chalk River, ON (Canada). Chalk River Nuclear Labs.
- Santa Clara Univ., Santa Clara, CA (United States)
- International Atomic Energy Agency (IAEA), Vienna (Austria)
- Univ. of California, Berkeley, CA (United States)
- Univ. of Illinois at Urbana-Champaign, IL (United States)
- Univ. of Louisville, KY (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Zhejiang Univ., Hangzhou (China)
- Zhejiang Univ., Hangzhou (China); Nanjing Univ. (China)
Nematic fluctuations occur in a wide range physical systems from biological molecules to cuprates and iron pnictide high-Tc superconductors. It is unclear whether nematicity in pnictides arises from electronic spin or orbital degrees of freedom. We studied the iron-based Mott insulators La2O2Fe2OM2M = (S, Se), which are structurally similar to pnictides. Nuclear magnetic resonance revealed a critical slowing down of nematic fluctuations and complementary Mössbauerr spectroscopy data showed a change of electrical field gradient. The neutron pair distribution function technique detected local C2 fluctuations while neutron diffraction indicates that global C4 symmetry is preserved. A geometrically frustrated Heisenberg model with biquadratic and single-ion anisotropic terms provides the interpretation of the low temperature magnetic fluctuations. The nematicity is not due to spontaneous orbital order, instead it is linked to geometrically frustrated magnetism based on orbital selectivity. This study highlights the interplay between orbital order and spin fluctuations in nematicity.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; German Research Foundation (DFG); National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC)
- Grant/Contract Number:
- AC05-00OR22725; AC02-05CH11231; SFB 1143; GR 4667; 2016YFA0300402; NSFC-12074335; NSFC-11974095
- OSTI ID:
- 1763451
- Journal Information:
- npj Quantum Materials, Vol. 6, Issue 1; ISSN 2397-4648
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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