Charge transfer gap for T′-RE2CuO4 and T-La2CuO4 as estimated from Madelung potential calculations

被引：8

作者：

Tsukada, A.

Shibata, H.

Noda, M.

Yamamoto, H.

Naito, M.

机构：

[1] Tokyo Univ Agr & Technol, Dept Appl Phys, Naito Lab, Koganei, Tokyo 1848588, Japan

[2] NTT Corp, Basic Res Labs, Kanagawa 2430198, Japan

[3] Tokyo Univ Sci, Chiba 2788510, Japan

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2006年 / 445卷

关键词：

mother compound; T '-structure; charge-transfer gap; Madelung potential;

D O I：

10.1016/j.physc.2006.03.087

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

T '-RE2CUO4 (RE: rare-earth element), after appropriate "reduction", has fairly high conductivity and also exhibits clear Fermi edge in photoemission spectroscopy. To clarify the origin of conductivity in the T ' mother compounds, we evaluated the unscreened charge-transfer gap (Delta(0)) for T '-RE2CUO4 and T-La2CuO4. The Delta(0) value for T '-compounds almost linearly decreases with increasing the ionic radius of RE from 12.24 eV for T '-Tm2CuO4 to 9.90 eV for T '-La2CuO4. The results qualitatively explain metallic conductivity in T '-RE2CuO4 for large RE. (c) 2006 Published by Elsevier B.V.

引用

页码：94 / 96

页数：3

共 14 条

[1] OPTICAL-SPECTRA OF PR2-XCEXCUO4-DELTA CRYSTALS - EVOLUTION OF IN-GAP STATES WITH ELECTRON DOPING [J].

ARIMA, T ;

TOKURA, Y ;

UCHIDA, S .

PHYSICAL REVIEW B, 1993, 48 (09) :6597-6603

[2] HIGH-PRESSURE SYNTHESIS AND STRUCTURAL STUDY OF R2CUO4 COMPOUNDS WITH R = Y, TB, DY, HO, ER, TM [J].

BORDET, P ;

CAPPONI, JJ ;

CHAILLOUT, C ;

CHATEIGNER, D ;

CHENAVAS, J ;

FOURNIER, T ;

HODEAU, JL ;

MAREZIO, M ;

PERROUX, M ;

THOMAS, G ;

VARELA, A .

PHYSICA C, 1992, 193 (1-2) :178-188

[3] CRYSTAL-STRUCTURE OF THE HIGH-TEMPERATURE SUPERCONDUCTOR LA1.85SR0.15CUO4 ABOVE AND BELOW TC [J].

CAVA, RJ ;

SANTORO, A ;

JOHNSON, DW ;

RHODES, WW .

PHYSICAL REVIEW B, 1987, 35 (13) :6716-6720

[4] Metal-insulator transitions [J].

Imada, M ;

Fujimori, A ;

Tokura, Y .

REVIEWS OF MODERN PHYSICS, 1998, 70 (04) :1039-1263

[5] EXTRA OXYGEN IN ELECTRON SUPERCONDUCTORS - CE AND TH DOPED ND2CUO4+DELTA AND GD2CUO4+DELTA [J].

MORAN, E ;

NAZZAL, AI ;

HUANG, TC ;

TORRANCE, JB .

PHYSICA C, 1989, 160 (01) :30-34

[6] Origin of superconducting carriers in "non-doped" T'-(La,RE)2CuO4 (RE = Sm, Eu, Gd, Tb, Lu, and Y) prepared by molecular beam epitaxy [J].

Noda, M ;

Tsukada, A ;

Yamamoto, H ;

Naito, M .

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2005, 426 :220-224

[7] EVIDENCE OF APICAL OXYGEN IN ND2CUO(Y) DETERMINED BY SINGLE-CRYSTAL NEUTRON-DIFFRACTION [J].

RADAELLI, PG ;

JORGENSEN, JD ;

SCHULTZ, AJ ;

PENG, JL ;

GREENE, RL .

PHYSICAL REVIEW B, 1994, 49 (21) :15322-15326

[8] PRESSURE-DEPENDENCE OF CHARGE-TRANSFER-TYPE GAPS IN CUO2 LAYERED COMPOUNDS [J].

TOKURA, Y ;

KIKUCHI, K ;

ARIMA, T ;

UCHIDA, S .

PHYSICAL REVIEW B, 1992, 45 (13) :7580-7583

[9] CU-O NETWORK DEPENDENCE OF OPTICAL CHARGE-TRANSFER GAPS AND SPIN-PAIR EXCITATIONS IN SINGLE-CUO2-LAYER COMPOUNDS [J].

TOKURA, Y ;

KOSHIHARA, S ;

ARIMA, T ;

TAKAGI, H ;

ISHIBASHI, S ;

IDO, T ;

UCHIDA, S .

PHYSICAL REVIEW B, 1990, 41 (16) :11657-11660

[10] WHY ARE SOME OXIDES METALLIC, WHILE MOST ARE INSULATING [J].

TORRANCE, JB ;

LACORRE, P ;

ASAVAROENGCHAI, C ;

METZGER, RM .

PHYSICA C, 1991, 182 (4-6) :351-364

← 1 2 →