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Nodal Gap Induced by Spin Density Wave Excitations in La2-xSrxCuO4 x=1.92%
Itzik Kapon [1] , David Ellis [1] , Gil Drachuck [5] , Christof Niedermayer [2] , Markus Hucker [3] , Jörg Strempfer [4] , Amit Keren [1]
[1] Technion - Israeli Institute of Technology
[2] Paul Scherrer Institute, Villigen, Switzerland
[3] Brookhaven National Laboratory
[4] Deutsches Elektronen-Synchrotron (DESY)
[5] Iowa State University
Nodal Gap Induced by Spin Density Wave Excitations in La2-xSrxCuO4 x=1.92%
Previous angle-resolved photoemission and elastic neutron scattering measurements on the antiferromagnetic insulator La2-xSrxCuO4 x=1.92% revealed that a nodal gap opens at Tnode=45 K and incommensurate static spin density wave appears at Tstat=30 K ([1]). Here we report inelastic neutron scattering measurements on the same crystal, which shows dynamic incommensurate SDW that freezes at the same temperature the nodal gap opens. Our data also suggest a gap for SDW excitations. In addition, hard x-ray scattering measurements show no signature of CDW. Therefore, we speculate that the nodal gap in the electronic band opens due to SDW with no contribution from CDW. Our data demonstrate how the electrons’ spin and charge interact with each other in the cuprates.
[1] G. Drachuck et al., NCOMM 5, 3390, (2014).