TEMPERATURE-DEPENDENCE OF THE EPR-SPECTRA OF GDBA2CU3O7-DELTA COMPOUNDS IN ORTHORHOMBIC AND TETRAGONAL PHASES

被引：29

作者：

GUSKOS, N ^{[1
]}

TRIBERIS, GP ^{[1
]}

CALAMIOTOU, M ^{[1
]}

TRIKALINOS, C ^{[1
]}

KOUFOUDAKIS, A ^{[1
]}

MITROS, C ^{[1
]}

GAMARISEALE, H ^{[1
]}

NIARCHOS, D ^{[1
]}

机构：

[1] NATL RES CTR DEMOCRITOS,INST MAT SCI,GR-15310 ATHENS,GREECE

来源：

PHYSICA STATUS SOLIDI B-BASIC RESEARCH | 1990年 / 162卷 / 01期

关键词：

D O I：

10.1002/pssb.2221620121

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

EPR measurements are presented for two samples of GdBa2Cu3O7-delta of which one is superconducting (orthorhombic phase) and one is nonsuperconducting (tetragonal phase). For the superconducting sample signal associated with Cu2+ and Gd3+ ions are detected above and below T(c) (with g(Gd) = 1.999(2)). The sample with oxygen deficiency gives an EPR signal with a strong temperature dependence up to 30 K coming from Gd3+ ions in GdBa2Cu3O7-delta, with g = 2.063(3). These characteristics can be ascribed to the semiconducting properties of the tetragonal phase of GdBa2Cu3O7-delta. Below T = 30 K, the sample with tetragonal structure gives an additional EPR line associated with Cu2+-Cu2+ion pairs. The intensity of the EPR signal strongly depends on the temperature.

引用

页码：243 / 249

页数：7

共 17 条

[1]

Abragam A., 1970, ELECT PARAMAGNETIC R

[2] EPR STUDY OF POLYCRYSTALLINE SUPERCONDUCTORS WITH YBA2CU3O7 STRUCTURE [J].

ALEKSEEVSKII, NE ;

MITIN, AV ;

NIZHANKOVSKII, VI ;

GARIFULLIN, IA ;

GARIFYANOV, NN ;

KHALIULLIN, GG ;

KHYLBOV, EP ;

KOCHELAEV, BI ;

TAGIROV, LR .

JOURNAL OF LOW TEMPERATURE PHYSICS, 1989, 77 (1-2) :87-118

[3]

ANDERS AG, 1989, J LOW TEMP PHYS, V15, P328

[4] MICROWAVE PROPERTIES OF SOLIDS [J].

BAGGULEY, DMS ;

OWEN, J .

REPORTS ON PROGRESS IN PHYSICS, 1957, 20 :304-378

[5] PARAMAGNETIC RESONANCE IN COPPER SULPHATE [J].

BAGGULEY, DMS ;

GRIFFITHS, JHE .

NATURE, 1948, 162 (4118) :538-539

[6] CRYSTAL-FIELD INTERACTION IN THE GDXEU1-XBA2CU3O7-DELTA SUPERCONDUCTORS [J].

CAUSA, MT ;

FAINSTEIN, C ;

NIEVA, G ;

SANCHEZ, R ;

STEREN, LB ;

TOVAR, M ;

ZYSLER, R ;

VIER, DC ;

SCHULTZ, S ;

OSEROFF, SB ;

FISK, Z ;

SMITH, JL .

PHYSICAL REVIEW B, 1988, 38 (01) :257-261

[7] VIBRONIC BIPOLARON MODEL FOR THE HIGH-TC SUPERCONDUCTIVITY [J].

GEORGIEV, M ;

BORISSOV, M .

PHYSICA C, 1988, 153 (01) :208-209

[8] ON THE DETERMINATION OF THERMAL IONIZATION-ENERGY OF DEEP CENTERS FROM ELECTRON-SPIN-RESONANCE DATA [J].

GODLEWSKI, M ;

PRZYBYLINSKA, H ;

LANGER, JM .

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 1983, 30 (02) :105-107

[9] ON THE POSSIBILITY OF THE EXISTENCE OF CU-3+ IONS IN HIGH-TC SUPERCONDUCTING SAMPLES OF YBA2CU3OX [J].

GUSKOS, N ;

LEVENTOURI, T ;

TRIKALINOS, C ;

CALAMIOTOU, M ;

PARASKEVAS, SM ;

KURIATA, J ;

SADLOWSKI, L .

PHYSICA STATUS SOLIDI B-BASIC RESEARCH, 1989, 152 (01) :K9-K12

[10] THE ANOMALOUS ELECTRIC-FIELD EFFECT IN THE ELECTRON-PARAMAGNETIC-RES OF CDF2 - GD-3+ [J].

GUSKOS, N ;

KURIATA, J ;

SALIKHOV, IH .

JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1984, 17 (12) :2175-2180

← 1 2 →