Abstract
The low-energy electronic structure, including the Fermi surface topology, of the itinerant metamagnet hbox {Sr}_{{4}}hbox {Ru}_{{3}}hbox {O}_{{10}} is investigated for the first time by synchrotron-based angle-resolved photoemission. Well-defined quasiparticle band dispersions with matrix element dependencies on photon energy or photon polarization are presented. Four bands crossing the Fermi-level, giving rise to four Fermi surface sheets are resolved; and their complete topography, effective mass as well as their electron and hole character are determined. These data reveal the presence of kink structures in the near-Fermi-level band dispersion, with energies ranging from 30 to 69 meV. Together with previously reported Raman spectroscopy and lattice dynamic calculation studies, the data suggest that these kinks originate from strong electron–phonon coupling present in hbox {Sr}_{{4}}hbox {Ru}_{{3}}hbox {O}_{{10}}. Considering that the kink structures of hbox {Sr}_{{4}}hbox {Ru}_{{3}}hbox {O}_{{10}} are similar to those of the other three members of the Ruddlesden Popper structured ruthenates, the possible universality of strong coupling of electrons to oxygen-related phonons in hbox {Sr}_{n+1}hbox {Ru}_{{n}}hbox {O}_{3n+1} compounds is proposed.
Highlights
The low-energy electronic structure, including the Fermi surface topology, of the itinerant metamagnet Sr4Ru3O10 is investigated for the first time by synchrotron-based angle-resolved photoemission
To probe different features of the near-EF band dispersions, we have explored the effect of matrix elements on the quasiparticle band dispersions of Sr4Ru3O10 using different photon energies (60 and 110 eV) and polarizations of the incident light, linear horizontal polarization (LHP) and linear vertical polarization (LVP)
This study has provided the first information on the near-EF band dispersions and Fermi surface (FS) of Sr4Ru3O10 and the effect of changing different matrix elements on electronic band dispersions, as well as electronic correlation effects present in this compound
Summary
The low-energy electronic structure, including the Fermi surface topology, of the itinerant metamagnet Sr4Ru3O10 is investigated for the first time by synchrotron-based angle-resolved photoemission. The Sr3Ru2O7/SrRuO3 and Sr4Ru3O10/SrRuO3 heterostructures have been reported to grow epitaxially on conventional oxide s ubstrates[14], which could pave a way for the precise exploration of the known size effects in the magnetic properties of these c ompounds[15] by using ultra-thin devices fabricated from such heterostructures All these behaviours show that Srn+1RunO3n+1 materials provide a fascinating playground to explore both novel quantum phenomena and diverse oxide-based electronic device directions. To explain the double metamagnetic transition, it has been proposed that the metamagnetic behaviours could originate either from magnetic ordering of the two inequivalent Ru sites or from fine structure in the near Fermi level ( EF ) electronic structure due to the presence of two van Hove singularities (vHS) in the density of states (DOS)[19] These vHS would render the material magnetically unstable to the extent that a metamagnetic transition would be induced by the application of a magnetic field. Angle-resolved photoemission spectroscopy (ARPES) is the best candidate because it is one of the most direct methods to measure the momentum-dependent electronic band dispersion of s olids[36]
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