Origin of the gap-like behavior in pure and doped URu<sub>2</sub>Si<sub>2</sub> : A combined study via quasiparticle scattering spectroscopy and resistivity measurements
ORAL
Abstract
Using Quasiparticle scattering spectroscopy (QPS), we track the temperature dependence of the hybridization gap in URu2-xFexSi2 and URu2Si2-xPx (URSP) [1,2,3] in all substitutions, whether the hidden order (HO) appears or not. This poses a challenge to the Fermi surface gapping scenario, due to the absence of drastic changes in the conductance spectra across the HO transition. As an alternative way to explain the gap-like behavior, we adopt a model based on gapped bosonic excitations in the ordered state [4]. With an unusual temperature dependence of their stiffness, the temperature-dependent resistivity can be reproduced well including the jump at the HO transition. The extracted gap increases with increasing Fe-content, which agrees with the behavior of the E1 gap in inelastic neutron scattering under pressure. This implies that the E1 gap might originate from the same gapped bosonic excitations.
[1] Park et al PRL 108,246403(2012); [2] Gallagher et al Nat.Commun.7,10712(2016); [3] Ran et al PNAS 113,13348(2016); [4] Jobiliong et al PRB 72,104428(2005).
[1] Park et al PRL 108,246403(2012); [2] Gallagher et al Nat.Commun.7,10712(2016); [3] Ran et al PNAS 113,13348(2016); [4] Jobiliong et al PRB 72,104428(2005).
*Funding supports are :NSF DMR 17-04712(SZ,WKP,LG);NSF/DMR-1644779(RB,GC);DOE DE-FG02-04ER46105(NP,BM).The work at NHMFL is partly supported by NSF/DMR-1644779 and the State of Florida
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Presenters
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Shengzhi Zhang
- Florida State University
- National High Magnetic Field Lab, Florida State University