ANOMALOUS PEAK IN THE THERMOPOWER OF YBA2CU3O7-DELTA SINGLE-CRYSTALS - A POSSIBLE FLUCTUATION EFFECT

被引：71

作者：

HOWSON, MA

SALAMON, MB

FRIEDMANN, TA

RICE, JP

GINSBERG, D

机构：

[1] NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899

[2] UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801

[3] UNIV ILLINOIS,MAT RES LAB,URBANA,IL 61801

来源：

PHYSICAL REVIEW B | 1990年 / 41卷 / 01期

关键词：

D O I：

10.1103/PhysRevB.41.300

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present results for the thermopower of five crystals of YBa2Cu3O7- from the transition temperature Tc to 250 K and in magnetic fields to 2 T. The thermopower is approximately -4 V/K at 250 K for all samples, with a broad phonon drag peak around 150 K. Sharp peaks in the thermopower are observed in the vicinity of Tc. The thermopower is qualitatively the same for all crystals except one that was annealed at 650°C in oxygen. That crystal had a positive thermopower and exhibited no peak at Tc. After a reanneal in oxygen at 400°C, the negative thermopower and peak at Tc appeared. We discuss the possibility that the anomalous peak at Tc is a fluctuation effect and suggest a simple kinetic argument for the presence of a divergent fluctuation contribution. © 1990 The American Physical Society.

引用

页码：300 / 306

页数：7

共 20 条

[1]

ANTEMENKO SK, 1989, PHYS LETT A, V138, P428

[2]

Ashcroft, 1976, SOLID STATE PHYS, P24

[3]

CRABTREE GW, 1988, QUANTUM FIELD THEORY

[4] ANISOTROPIC THERMOELECTRIC-POWER AND CONDUCTIVITY IN SINGLE-CRYSTAL YBA2CU3OY [J].

CROMMIE, MF ;

ZETTL, A ;

BARBEE, TW ;

COHEN, ML .

PHYSICAL REVIEW B, 1988, 37 (16) :9734-9737

[5]

GOLDENFELD M, 1988, SOLID STATE COMMUN, V65, P465

[6] TRANSPORT-PROPERTIES OF THE OXIDES Y1-XPRXBA2CU3O7-DELTA (0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-1) - EFFECTS OF BAND FILLING AND LATTICE DISTORTION ON SUPERCONDUCTIVITY [J].

GONCALVES, AP ;

SANTOS, IC ;

LOPES, EB ;

HENRIQUES, RT ;

ALMEIDA, M ;

FIGUEIREDO, MO .

PHYSICAL REVIEW B, 1988, 37 (13) :7476-7481

[7] OUT-OF-PLANE CONDUCTIVITY IN SINGLE-CRYSTAL YBA2CU3O7 [J].

HAGEN, SJ ;

JING, TW ;

WANG, ZZ ;

HORVATH, J ;

ONG, NP .

PHYSICAL REVIEW B, 1988, 37 (13) :7928-7931

[8] AN ANOMALOUS PEAK IN THE THERMOPOWER OF Y1BA2CU3O7-DELTA CRYSTALS [J].

HOWSON, MA ;

SALAMON, MB ;

FREIDMANN, TA ;

INDERHEES, SE ;

RICE, JP ;

GINSBERG, DM ;

GHIRON, KM .

JOURNAL OF PHYSICS-CONDENSED MATTER, 1989, 1 (02) :465-471

[9] SPECIFIC-HEAT OF SINGLE-CRYSTALS OF YBA2CU3O7-DELTA - FLUCTUATION EFFECTS IN A BULK SUPERCONDUCTOR [J].

INDERHEES, SE ;

SALAMON, MB ;

GOLDENFELD, N ;

RICE, JP ;

PAZOL, BG ;

GINSBERG, DM ;

LIU, JZ ;

CRABTREE, GW .

PHYSICAL REVIEW LETTERS, 1988, 60 (12) :1178-1180

[10] THERMOPOWER AND THE ELECTRON-PHONON INTERACTION IN HIGH-TC SUPERCONDUCTORS [J].

KAISER, AB .

PHYSICAL REVIEW B, 1988, 37 (10) :5924-5927

← 1 2 →