THE CHARGE BAG MECHANISM OF SUPERCONDUCTIVITY IN CARRIER INJECTED CHARGE-DENSITY WAVE SYSTEMS

被引:7
作者
GAITONDE, DM
BEHERA, SN
机构
[1] Institute of Physics, Bhubaneswar
来源
PHYSICA C | 1991年 / 173卷 / 3-4期
关键词
D O I
10.1016/0921-4534(91)90382-9
中图分类号
O59 [应用物理学];
学科分类号
摘要
A new mechanism is proposed for superconductivity (SC) arising in carrier injected charge density wave (CDW) insulators. It is demonstrated that an attractive interaction between the injected charge carriers is predominantly generated by the exchange of the CDW-amplitude mode, which is a high frequency optic phonon of the lattice distorted CDW state. This attractive interaction then produces pairing and hence superconductivity, whose transition temperature (T(c)) is enhanced due to an increase in the cutoff frequency as well as the density of states at the Fermi level. It is argued that the model can successfully explain the high temperature superconductivity observed in the perovskite compound Ba1-xK(x)BiO3. An understanding of the enhancement of T(c) on intercalation in certain layered transition metal dichalchogenides can also be achieved in terms of this charge bag model.
引用
收藏
页码:293 / 303
页数:11
相关论文
共 24 条
[1]  
[Anonymous], 2018, THEORY SUPERCONDUCTI
[2]   SUPERCONDUCTIVITY AND CHARGE-DENSITY WAVES [J].
BALSEIRO, CA ;
FALICOV, LM .
PHYSICAL REVIEW B, 1979, 20 (11) :4457-4464
[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]  
Behera S. N., 1987, Theoretical and Experimental Aspects of Valence Fluctuations. Proceedings of the Fifth International Conference on Valence Fluctuations, P565
[5]   COLLECTIVE MODES OF A SPIN-DENSITY WAVE SUPERCONDUCTOR [J].
BEHERA, SN ;
BHATTACHARYA, S .
PHYSICA C, 1990, 167 (1-2) :112-126
[6]  
BEHERA SN, 1989, STUDIES HIGH TEMPERA, V2, P329
[7]   SUPERCONDUCTIVITY NEAR 30-K WITHOUT COPPER - THE BA0.6K0.4BIO3 PEROVSKITE [J].
CAVA, RJ ;
BATLOGG, B ;
KRAJEWSKI, JJ ;
FARROW, R ;
RUPP, LW ;
WHITE, AE ;
SHORT, K ;
PECK, WF ;
KOMETANI, T .
NATURE, 1988, 332 (6167) :814-816
[8]  
CAVA RJ, 1989, MRS BULL, P49
[9]  
HAKEN H, 1976, QUANTUM FIELD THEORY, P290
[10]   EVIDENCE FOR PHONON-MEDIATED COUPLING IN SUPERCONDUCTING BA1-XKXBIO3 [J].
HINKS, DG ;
DABROWSKI, B ;
RICHARDS, DR ;
JORGENSEN, JD ;
PEI, SY ;
ZASADZINSKI, JF .
PHYSICA C, 1989, 162 :1405-1408