PCP1-6
Temperature dependence of quasiparticle structure in La2-xSrxCuO4 revealed by angle-resolved photoemission spectroscopy
13:30-15:00 Dec.3
*M. Nagamoto1, D. Ootsuki1, T. Ishida1, N. Tsutsumi1, Y. Lee1, M. Kitamura2, K. Ozawa3, A. Fujimori4, 5, S. Komiya6, Y. Ando7 and T. Yoshida1
Graduate School of Human and Environmental Studies, Kyoto University, Sakyo-ku, Kyoto, Kyoto, 606-8501, Japan1
Institute for Advanced Synchrotron Light Source, National Institutes for Quantum Science and Technology (QST), Aoba-ku, Sendai, Miyagi, 980-8579, Japan2
Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki, 305-0801, Japan3
Department of Physics and Center for Quantum Science and Technology, National Tsing Hua University, Kuang Fu Load, Hsinchu, 30013, Taiwan4
Department of Physics, The University of Tokyo, Bunkyo-ku, Tokyo, 113-0033, Japan5
Materials Science Laboratory, Center Research Institute of Electric Power Industry, Nagasaka, Yokosuka, Kanagawa, 240-0196, Japan6
Physics Institute II, University of Cologne, Zülpicher Str. 77, 50937 Köln, Germany7
High-Tc cuprate superconductors exhibit various quantum phases such as superconductivity, antiferromagnetism, pseudogap, charge order, and strange metal. The strange metal is characterized by a linear-in-temperature resistivity and the link to the high-Tc superconductivity has been expected [1]. By using angle-resolved photoemission spectroscopy (ARPES), it has been reported that the temperature-dependent quasiparticle structure in Bi-family cuprates is associated with the superfluid density which characterizes the phase coherence of the Cooper pairs [2]. Furthermore, the coherent quasiparticle peak disappears in the high-temperature region where the in-plane electrical resistivity shows the linear temperature dependence [3]. These evidences indicate the importance for investigating the temperature dependence of the quasiparticle structure. As for La2-xSrxCuO4, the temperature dependence of the quasiparticle structure has been reported only by angle-integrated photoemission spectroscopy [4] where a distinct coherent quasiparticle peak is hidden due to the integration of angle information. Thus, the fate of coherent quasiparticles and its relationship to the linear-in-temperature resistivity have not been clarified in La2-xSrxCuO4.
In this work, we have performed ARPES measurements to investigate the temperature dependence of the quasiparticle structure in the nodal region of La2-xSrxCuO4. Figure 1 shows the temperature dependence of the energy distribution curve at the Fermi wave number in La2-xSrxCuO4 (x = 0.22). One can see a distinct quasiparticle peak at T = 50 K, while the quasiparticle peak completely disappears at T = 300 K. This result agrees with the temperature dependence of the electrical resistivity, indicating the loss of the coherent quasiparticles at high temperature [5].
In this presentation, we will show the detailed result of the temperature dependence of quasiparticle structure and the doping dependence in La2-xSrxCuO4.
[1] R. A. Cooper et al., Science 323, 603-607 (2009).
[2] D. L. Feng et al., Science 289, 277-281 (2000).
[3] A. Kaminski et al., Phys. Rev. Lett. 90, 207003 (2003).
[4] M. Hashimoto et al., Phys. Rev. B 79, 140502(R) (2009).
[5] N. E. Hussey et al., Philos. Trans. R. Soc. A 369, 1626 (2011).
Figure 1. Energy distribution curves on the Fermi wave number in La2-xSrxCuO4 (x = 0.22) at T = 50 K and 300 K
Keywords: cuprate, ARPES, quasiparticle, temperature dependence, doping dependence