Chinese Physics C > 2003, Vol. 27 > Issue(S1): 40-44

O 1s2p2p Auger Process Investigation of the Pr_1-xSr_xMnO₃System

Synchrotron Radiation Laboratory,Institute of High Energy Physics,CAS,Beijing 1000392 Nuclear Analysis Laboratory,Institute of High Energy Physics,CAS,Beijing 100039,China

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Abstract：
We have measured the photon-energy dependence of the O 1s2p2p Auger line at the O K threshold,below Mn L _2,3edge of colossal magnetoresistance (CMR) materials Pr _1-xSr _xMnO ₃(PSMO) with x=0.0 and x=0.3 compositions.Experimental results show that the O 1s2p2p Auger peak splits and it can be best fitted to three component peaks.The relative intensity of the three peaks feature retain essentially similar values,in an experiment allowable error range of several percents,for both composition PSMO at O K threshold and below Mn L _2,3excitation.However,the total intensity has fluctuations indicating the feature of final state effect.This situation further changes drastically at above Mn L _2,3excitation energy by increasing the total intensity of x=0.3 system by a factor of 4 to that of x=0.0.These are discussed in terms of possible interatomic response and different valence band DOS for different PSMO compositions in the frame of covalent picture.

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QIAN Hai-Jie, SU Run, WANG Jia-Ou, WU Xiang, DONG Yu-Hui, WU Zi-Yu, WANG Yu-Tian, WEI Long, O 1s2p2p Auger Process Investigation of the Pr _1-xSr _xMnO ₃System[J]. Chinese Physics C, 2003, 27(S1): 40-44.

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Received: 2003-11-21
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

O 1s2p2p Auger Process Investigation of the Pr_1-xSr_xMnO₃System

Corresponding author:QIAN Hai-Jie,

Synchrotron Radiation Laboratory,Institute of High Energy Physics,CAS,Beijing 1000392 Nuclear Analysis Laboratory,Institute of High Energy Physics,CAS,Beijing 100039,China

Received Date:2003-11-21
Accepted Date:1900-01-01
Available Online:2003-01-02

Abstract:We have measured the photon-energy dependence of the O 1s2p2p Auger line at the O K threshold,below Mn L_2,3edge of colossal magnetoresistance (CMR) materials Pr_1-xSr_xMnO₃(PSMO) with x=0.0 and x=0.3 compositions.Experimental results show that the O 1s2p2p Auger peak splits and it can be best fitted to three component peaks.The relative intensity of the three peaks feature retain essentially similar values,in an experiment allowable error range of several percents,for both composition PSMO at O K threshold and below Mn L_2,3excitation.However,the total intensity has fluctuations indicating the feature of final state effect.This situation further changes drastically at above Mn L_2,3excitation energy by increasing the total intensity of x=0.3 system by a factor of 4 to that of x=0.0.These are discussed in terms of possible interatomic response and different valence band DOS for different PSMO compositions in the frame of covalent picture.