Spin-orbital entanglement and the breakdown of singlets and triplets in Sr 2RuO 4 revealed by spin- and angle-resolved photoemission spectroscopy

Spin-orbit coupling has been conjectured to play a key role in the low-energy electronic structure of Sr2RuO4. By using circularly polarized light combined with spin- and angle-resolved photoemission spectroscopy, we directly measure the value of the effective spin-orbit coupling to be 130±30 meV. T...

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Hauptverfasser: Veenstra, C. N. (VerfasserIn) , Haverkort, Maurits W. (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 26 March 2014
In: Physical review letters
Year: 2014, Jahrgang: 112, Heft: 12, Pages: 127002
ISSN:1079-7114
DOI:10.1103/PhysRevLett.112.127002
Online-Zugang:Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevLett.112.127002
Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.112.127002
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Verfasserangaben:C.N. Veenstra, Z.-H. Zhu, M. Raichle, B. M. Ludbrook, A. Nicolaou, B. Slomski, G. Landolt, S. Kittaka, Y. Maeno, J.H. Dil, I.S. Elfimov, M.W. Haverkort, and A. Damascelli

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520 |a Spin-orbit coupling has been conjectured to play a key role in the low-energy electronic structure of Sr2RuO4. By using circularly polarized light combined with spin- and angle-resolved photoemission spectroscopy, we directly measure the value of the effective spin-orbit coupling to be 130±30 meV. This is even larger than theoretically predicted and comparable to the energy splitting of the dxy and dxz,yz orbitals around the Fermi surface, resulting in a strongly momentum-dependent entanglement of spin and orbital character in the electronic wavefunction. As demonstrated by the spin expectation value ⟨→sk⋅→s−k⟩ calculated for a pair of electrons with zero total momentum, the classification of the Cooper pairs in terms of pure singlets or triplets fundamentally breaks down, necessitating a description of the unconventional superconducting state of Sr2RuO4 in terms of these newly found spin-orbital entangled eigenstates. 
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