Temperature-dependent pseudogap in the oxypnictides LaFeAsO 1-x F x and LaFePO 1-x F x seen via angle-integrated photoemission
Temperature-dependent pseudogap in the oxypnictides LaFeAsO 1-x F x and LaFePO 1-x F x seen via angle-integrated photoemission
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DOI：
10.1103/physrevb.79.060503
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发表时间：
2009-02
影响因子：
3.7
通讯作者：
Y. Ishida;T. Shimojima;K. Ishizaka;T. Kiss;M. Okawa;T. Togashi;S. Watanabe;Xing Wang;Chunjun Chen;Y. Kamihara;M. Hirano;H. Hosono;Shik Shin
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文献类型：
--
作者：
Y. Ishida;T. Shimojima;K. Ishizaka;T. Kiss;M. Okawa;T. Togashi;S. Watanabe;Xing Wang;Chunjun Chen;Y. Kamihara;M. Hirano;H. Hosono;Shik Shin
We have performed a temperature-dependent angle-integrated laser photoemission study of iron oxypnictide superconductors LaFeAsO:F and LaFePO:F exhibiting critical-transition temperatures (${T}_{c}$'s) of 26 and 5 K, respectively. We find that high-${T}_{c}$ LaFeAsO:F exhibits a temperature-dependent pseudogaplike feature extending over $\ensuremath{\sim}0.1\text{ }\text{eV}$ about the Fermi level at 250 K, whereas such a feature is absent in low-${T}_{c}$ LaFePO:F. We also find $\ensuremath{\sim}20\text{-meV}$ pseudogaplike features and signatures of superconducting gaps in both LaFeAsO:F and LaFePO:F. We discuss the possible origins of the unusual pseudogaplike features through comparison with the high-${T}_{c}$ cuprates.
We have performed a temperature-dependent angle-integrated laser photoemission study of iron oxypnictide superconductors LaFeAsO:F and LaFePO:F exhibiting critical-transition temperatures (${T}_{c}$'s) of 26 and 5 K, respectively. We find that high-${T}_{c}$ LaFeAsO:F exhibits a temperature-dependent pseudogaplike feature extending over $\ensuremath{\sim}0.1\text{ }\text{eV}$ about the Fermi level at 250 K, whereas such a feature is absent in low-${T}_{c}$ LaFePO:F. We also find $\ensuremath{\sim}20\text{-meV}$ pseudogaplike features and signatures of superconducting gaps in both LaFeAsO:F and LaFePO:F. We discuss the possible origins of the unusual pseudogaplike features through comparison with the high-${T}_{c}$ cuprates.