Temperature dependence of chemical potential in Bi2212 Experiment 試料 Bi2Sr2-xLaxCaCu2O8+d = 0.02, 0.03, 0.05, 0.06, Bi2Sr2Y0.2Ca0.8Cu2O8+d = 0.08, 0.15 (Tc～30 K, 85 K) 測定 ・XPS 励起光 Mg Ka線(1253.6 eV) 分解能 0.7 eV T = 8.5 K, 100 K, 200 K, 300 K ・ARPES 励起光 19 eV 分解能 14 meV T= 10 K, 100K, 200K, 300K Temperature Dependence of Core-level Spectra (=0.02) Temperature Dependence of Core-level Spectra (=0.03) Temperature Dependence of Core-level Spectra (=0.05) Temperature Dependence of Core-level Spectra (=0.06) Temperature Dependence of Core-level Spectra (=0.08) Temperature Dependence of Core-level Spectra (=0.15) Temperature Dependence of Energy Position I (Relative to energy at 8.5 K) ホールのドープとともに温度変化によるシフト量が抑制 Temperature Dependence of Energy Position II Temperature Dependence of Energy Position III (Relative to energy at =0.06) 非超伝導相ではすべての元素が同じ方向にシフトし 超伝導相でSr以外は逆にシフト Comparison with Theoretical Works Sr_8.5K (Experiment) Sr_100K Sr_200K Sr_300K T = 200 K (t-J model) T = 400 K T = 600 K T = 800 K T = 1000 K Chemical Potential Shift (eV) 0.4 0.2 J. Jaklic and P. Prelovsek, PRL. 77, 892 (1996) 0.0 -0.2 0.00 0.05 0.10 0.15 0.20 Hole concentration 0.25 0.30 Temperature dependence of valence band spectra I =0.03 Core-levelと同程度のシフト Temperature dependence of valence band spectra II =0.08 =0.03に比べてわずかな変化 Hysteresis (Doping Dependence) (Low→High→Low Temperature)
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