The electronic structure of La1.48Nd0.4Sr0.12CuO4 probed by high- and low-energy angle resolved photoemission
Claesson, Thomas1; Mĺnsson, Martin1; Önsten, Anneli1; Muro, Takayuki2; Matsushita, Tomohiro2; Nakamura , Tatsuya2; Kinoshita, Toyohiko2; Pailhés , Stéphane3; Chang, Johan3; Mesot, Joel3; Sassa, Yasmine3; Bendounan, Azzedine3; Shi, Ming3; Patthey, Luc3; Momono , Naoki2; Oda, Migaku2; Ido , Masayuki2; Tjernberg, Oscar1
1Sweden;
2Japan;
3Switzerland

In this study we present angle resolved photoemission spectroscopy (ARPES) data probing the electronic structure of the Nd-substituted high-Tc cuprate La1.48Nd0.4Sr0.12CuO4 (Nd-LSCO). Data have been acquired both at low (hν = 55 eV) and high (hν = 500 eV) photon energies. The low photon energy measurements offer the possibility of very high energy and momentum resolutions, making it possible to study spectral details such as the momentum dependence of the near Fermi edge quasi-particle peak. However, there is also essential information to be acquired from measurements at higher photon energy in the soft X-ray region. At hν = 500 eV the electronic escape depth is increased by a factor of roughly two, as compared measurements at low energy. This results in a significantly larger bulk-sensitivity, which might be important in this strongly correlated compound. At high energy, the experimentally determined Fermi surface shows obvious differences in shape as compared to the low energy results. Similar differences probably resulting from increased influence from electronic correlations in the bulk as compared to more surface-sensitive measurements have previously been reported in a high energy study of the related compound Nd1.85Ce0.15CuO4 (NCCO) [1]. Reference: [1] T. Claesson et al., Phys. Rev. Lett., 93, 136402 (2004). Acknowledgments: This research has been supported by the Swedish Research Council, the Göran Gustafsson Foundation, the Swiss National Science Foundation (through NCCR, MaNEP, and grant Nr 200020-105151), and the European Union.
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