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Angle-resolved photoemission studies of lattice polaron formation in the cuprate<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Ca</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Cl</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>

Kyle ShenDepartment of Applied Physics, Department of Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USAF. RonningDepartment of Applied Physics, Department of Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USAW. MeevasanaDepartment of Applied Physics, Department of Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USADong-Hui LuDepartment of Applied Physics, Department of Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USAN. J. C. IngleDepartment of Applied Physics, Department of Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USAF. BaumbergerDepartment of Applied Physics, Department of Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USAWei-Sheng LeeDepartment of Applied Physics, Department of Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USAL. L. MillerDepartment of Chemistry, University of Oregon, Eugene, Oregon 97403, USAY. KohsakaDepartment of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, JapanMasaki AzumaInstitute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, JapanM. TakanoInstitute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, JapanH. TakagiDepartment of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, JapanZhi‐Xun ShenDepartment of Applied Physics, Department of Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA

2007lv

ABI

Annotatsiya

To elucidate the nature of the single-particle excitations in the undoped parent cuprates, we have performed a detailed study of ${\mathrm{Ca}}_{2}\mathrm{Cu}{\mathrm{O}}_{2}{\mathrm{Cl}}_{2}$ using photoemission spectroscopy. The photoemission line shapes of the lower Hubbard band are found to be well-described by a polaron model. By comparing the line shape and temperature dependence of the lower Hubbard band with additional $\mathrm{O}\phantom{\rule{0.2em}{0ex}}2p$ and $\mathrm{Ca}\phantom{\rule{0.2em}{0ex}}3p$ states, we conclude that the dominant broadening mechanism arises from the interaction between the photohole and the lattice. The strength of this interaction was observed to be strongly anisotropic and may have important implications for the momentum dependence of the first doped hole states.

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DOI: 10.1103/physrevb.75.075115

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