Hole states in fluorine-doped La2CuO4 thin films probed by polarized x-ray-absorption spectroscopy

被引：12

作者：

Chen, JM ^{[1
]}

Nachimuthu, P

Liu, RS

Lees, ST

Gibbons, KE

Gameson, I

Jones, MO

Edwards, PP

机构：

[1] Synchrotron Radiat Res Ctr, Hsinchu, Taiwan

[2] Natl Taiwan Univ, Dept Chem, Taipei 10764, Taiwan

[3] Univ Birmingham, Sch Chem, Birmingham B15 2TT, W Midlands, England

来源：

PHYSICAL REVIEW B | 1999年 / 60卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.60.6888

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

High-resolution polarized x-ray-absorption spectra at the O K edge and Cu L edge for c-axis-oriented La2CuO4Fx thin films using a bulk-sensitive x-ray-fluorescence-yield detection method were investigated. In the O Is absorption edge of La2CuO4Fx, the prepeak at 528.7 eV is assigned to transitions into O 2p(xy) hole states located in the CuO2 planes. Fluoride ions present in La2CuO4Fx induce hole states in the CuO2 planes near the Fermi level, which in turn play an important role in enhancing superconductivity for this compound, as compared to parent La2CuO4. Thus, in La2CuO4Fx, fluoride ions are regarded as an electronic dopant to induce superconductivity. [S0163-1829(99)98233-8].

引用

收藏

页码：6888 / 6892

页数：5

相关论文

共 44 条

[1] Synthesis and superconducting properties of fluorinated La2CuO4 using NH4F [J].

Adachi, S ;

Wu, XJ ;

Tamura, T ;

Tatsuki, T ;

Tokiwa-Yamamoto, A ;

Tanabe, K .

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 1997, 291 (1-2) :59-66

[2] SYNTHESIS AND SUPERCONDUCTING PROPERTIES OF THE STRONTIUM COPPER OXY-FLUORIDE SR2CUO2F2+DELTA [J].

ALMAMOURI, M ;

EDWARDS, PP ;

GREAVES, C ;

SLASKI, M .

NATURE, 1994, 369 (6479) :382-384

[3] POSSIBLE HIGH-TC SUPERCONDUCTIVITY IN THE BA-LA-CU-O SYSTEM [J].

BEDNORZ, JG ;

MULLER, KA .

ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER, 1986, 64 (02) :189-193

[4] FLUORINATION OF LA2NIO4 AND LA2CUO4+DELTA [J].

BHAT, V ;

RAO, CNR ;

HONIG, JM .

SOLID STATE COMMUNICATIONS, 1992, 81 (09) :751-756

[5] FLUORINATION OF LA2-XSRXCUO4+DELTA - EXHIBITION OF SUPERCONDUCTIVITY FOR X-LESS-THAN-OR-EQUAL-TO-0.05 [J].

BHAT, V ;

HONIG, JM .

MATERIALS RESEARCH BULLETIN, 1995, 30 (10) :1253-1261

[6] L2,3 XANES OF THE HIGH-TC SUPERCONDUCTOR YBA2CU3O-7 WITH VARIABLE OXYGEN-CONTENT [J].

BIANCONI, A ;

CASTELLANO, AC ;

DESANTIS, M ;

RUDOLF, P ;

LAGARDE, P ;

FLANK, AM ;

MARCELLI, A .

SOLID STATE COMMUNICATIONS, 1987, 63 (11) :1009-1013

[7] IMPROVEMENT OF THE SUPERCONDUCTING PROPERTIES OF THE LA2-XBAXCUO4 SYSTEM (0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-0.15) BY LOW-TEMPERATURE FLUORINATION [J].

CASSART, M ;

GRIVEI, E ;

ISSI, JP ;

BENSALEM, E ;

CHEVALIER, B ;

BRISSON, C ;

TRESSAUD, A .

PHYSICA C, 1993, 213 (3-4) :327-337

[8] ELECTRONIC STATES IN LA2-XSRXCUO4+GAMMA PROBED BY SOFT-X-RAY ABSORPTION [J].

CHEN, CT ;

SETTE, F ;

MA, Y ;

HYBERTSEN, MS ;

STECHEL, EB ;

FOULKES, WMC ;

SCHLUTER, M ;

CHEONG, SW ;

COOPER, AS ;

RUPP, LW ;

BATLOGG, B ;

SOO, YL ;

MING, ZH ;

KROL, A ;

KAO, YH .

PHYSICAL REVIEW LETTERS, 1991, 66 (01) :104-107

[9] High-resolution X-ray absorption near edge structure studies of monophasic Tl2Ba2Ca2Cu3O10-delta (Tl-2223) superconductor [J].

Chen, JM ;

Chung, SC ;

Liu, RS .

SOLID STATE COMMUNICATIONS, 1996, 99 (07) :493-498

[10] Superconductivity at 55 K in La0.7Sr1.3Cu(O,F)(4+delta) with reduced CuO2 sheets and apical anions [J].

Chen, XL ;

Liang, JK ;

Tang, WH ;

Wang, G ;

Rao, GH .

PHYSICAL REVIEW B, 1995, 52 (22) :16233-16236

← 1 2 3 4 5 →