temperature dependence of chemical potential in bi2212
DESCRIPTION
Temperature dependence of chemical potential in Bi2212. Experiment. 試料 Bi 2 Sr 2-x La x CaCu 2 O 8+d = 0.02, 0.03, 0.05, 0.06, Bi 2 Sr 2 Y 0.2 Ca 0.8 Cu 2 O 8+d d = 0 .08, 0.15 (Tc ~ 30 K, 85 K) 測定 ・ XPS 励起光 Mg K a 線 (1253.6 eV) 分解能 0.7 eV T = 8.5 K, 100 K, 200 K, 300 K ・ ARPES - PowerPoint PPT PresentationTRANSCRIPT
Temperature dependence of Temperature dependence of chemical potential in Bi2212chemical potential in Bi2212
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 K 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
ExperimentExperiment
Temperature Dependence of Core-level Spectra (Temperature Dependence of Core-level Spectra (=0.02)=0.02)
Temperature Dependence of Core-level Spectra (Temperature Dependence of Core-level Spectra (=0.03)=0.03)
Temperature Dependence of Core-level Spectra (Temperature Dependence of Core-level Spectra (=0.05)=0.05)
Temperature Dependence of Core-level Spectra (Temperature Dependence of Core-level Spectra (=0.06)=0.06)
Temperature Dependence of Core-level Spectra (Temperature Dependence of Core-level Spectra (=0.08)=0.08)
Temperature Dependence of Core-level Spectra (Temperature Dependence of Core-level Spectra (=0.15)=0.15)
Temperature Dependence of Energy Position ITemperature Dependence of Energy Position I(Relative to energy at 8.5 K)(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 IITemperature Dependence of Energy Position II
Temperature Dependence of Energy Position IIITemperature Dependence of Energy Position III(Relative to energy at (Relative to energy at =0.06)=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
0.4
0.2
0.0
-0.2
Ch
em
ica
l Po
tent
ial S
hift
(e
V)
0.300.250.200.150.100.050.00
Hole concentration
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
Comparison with Theoretical WorksComparison with Theoretical Works
J. Jaklic and P. Prelovsek, PRL. 77, 892 (1996)
=0.03
Temperature dependence of valence band spectra ITemperature dependence of valence band spectra I
Core-levelと同程度のシフト
=0.08
Temperature dependence of valence band spectra IITemperature dependence of valence band spectra II
=0.03に比べてわずかな変化
Hysteresis (Doping Dependence)Hysteresis (Doping Dependence)(Low→High→Low Temperature)(Low→High→Low Temperature)