ENHANCEMENT OF TC IN BCS THEORY EXTENDED BY INTERBAND 2-PHONON EXCHANGE

被引：16

作者：

BUSSMANNHOLDER, A ^{[1
]}

BISHOP, AR ^{[1
]}

SIMON, A ^{[1
]}

机构：

[1] LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA

来源：

ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER | 1993年 / 90卷 / 02期

关键词：

D O I：

10.1007/BF02198152

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Band crossing and hybridization effects on superconductivity are investigated within a weak coupling limit of an extended BCS theory. Two-phonon modiated attractive two-band (p - d) interactions induce anisotropic coupled energy gaps, enhancement of the transition temperature T(c), and a material-dependent isotope effect. The individual gap to k(B)T(c) ratios deviate from the usual BCS value but their average recovers approximately the usual value. Effects on ultrasonic attenuation and coherence lengths are briefly discussed.

引用

页码：183 / 186

页数：4

共 43 条

[31]

Migdal A. B., 1958, ZH EKSP TEOR FIZ, V34, p[1438, 996]

[32] ORIGIN OF RAMAN-SCATTERING AND FERROELECTRICITY IN OXIDIC PEROVSKITES [J].

MIGONI, R ;

BILZ, H ;

BAUERLE, D .

PHYSICAL REVIEW LETTERS, 1976, 37 (17) :1155-1158

[33] 2-PHONON DEFORMATION POTENTIAL IN INSB [J].

NGAI, KL ;

JOHNSON, EJ .

PHYSICAL REVIEW LETTERS, 1972, 29 (24) :1607-&

[34]

NGAI KL, 1974, PHYS REV LETT, V232, P215

[35] CHARGE-TRANSFER GAP AND SUPEREXCHANGE INTERACTION IN INSULATING CUPRATES [J].

OHTA, Y ;

TOHYAMA, T ;

MAEKAWA, S .

PHYSICAL REVIEW LETTERS, 1991, 66 (09) :1228-1231

[36] ELECTRONIC-STRUCTURE OF THE HIGH-TEMPERATURE OXIDE SUPERCONDUCTORS [J].

PICKETT, WE .

REVIEWS OF MODERN PHYSICS, 1989, 61 (02) :433-512

[37] D-WAVE PAIRING NEAR A SPIN-DENSITY-WAVE INSTABILITY [J].

SCALAPINO, DJ ;

LOH, E ;

HIRSCH, JE .

PHYSICAL REVIEW B, 1986, 34 (11) :8190-8192

[38] ODD-PARITY SINGLET PAIRING IN THE POSITIVE-U HUBBARD-MODEL [J].

SCALETTAR, RT ;

SINGH, RRP ;

ZHANG, SC .

PHYSICAL REVIEW LETTERS, 1991, 67 (03) :370-373

[39] DYNAMIC SPIN FLUCTUATIONS AND THE BAG MECHANISM OF HIGH-TC SUPERCONDUCTIVITY [J].

SCHRIEFFER, JR ;

WEN, XG ;

ZHANG, SC .

PHYSICAL REVIEW B, 1989, 39 (16) :11663-11679

[40] BARDEEN-COOPER-SCHRIEFFER THEORY OF SUPERCONDUCTIVITY IN THE CASE OF OVERLAPPING BANDS [J].

SUHL, H ;

MATTHIAS, BT ;

WALKER, LR .

PHYSICAL REVIEW LETTERS, 1959, 3 (12) :552-554

← 1 2 3 4 5 →