CU-NQR STUDY OF ELECTRIC-FIELD GRADIENT AND NUCLEAR-SPIN RELAXATION IN LA2-XSRXCUO4-Y

被引：7

作者：

NAKAMURA, Y

KUMAGAI, K

机构：

[1] Department of Physics, Faculty of Science, Hokkaido University, Sapporo

来源：

PHYSICA B | 1990年 / 165卷

关键词：

D O I：

10.1016/S0921-4526(09)80237-8

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The Cu-NQR spectra are observed in the wide range of x in La2−xSrxCuO4−y. The change of oxygen coordination to Cu atoms causes the large difference of EFG at the Cu site. Nuclear relaxation rates T1−1 and T2−1 are enhanced remarkably for x<0.3 where the high Tc superconductivity appears, and suppressed largely for x>0.4. The temperature dependence of T1−1 for x>0.4 obeys the Korringa relation in the normal state. The NQR results suggest that the antiferromagnetic spin fluctuations are suppressed by hole-doping for x>0.4, but superconductivity appears in the presence of antiferromagnetic spin fluctuations for x<0.30. © 1990, Elsevier Science Publishers B.V. (North-Holland). All rights reserved.

引用

收藏

页码：1303 / 1304

页数：2

相关论文

共 8 条

[1] CU SPIN DYNAMICS IN HIGH-TC AND RELATED OXIDES INVESTIGATED BY NUCLEAR-SPIN-LATTICE RELAXATION [J].

IMAI, T ;

YASUOKA, H ;

SHIMIZU, T ;

UEDA, Y ;

YOSHIMURA, K ;

KOSUGE, K .

PHYSICA C, 1989, 162 :169-170

[2] NUCLEAR-QUADRUPOLE RESONANCE IN (LA1-XSRX)2CUO4 SYSTEM [J].

ISHIDA, K ;

KONDO, T ;

KITAOKA, Y ;

ASAYAMA, K .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1989, 58 (08) :2638-2641

[3] EVIDENCE OF MAGNETIC ORDER OF CU MOMENTS IN THE SUPERCONDUCTING AND NORMAL REGION OF LA2-XSRXCUO4 - OBSERVATION OF CU-NQR FOR 0.12 LESS-THAN-OR-EQUAL-TO X LESS-THAN-OR-EQUAL-TO 0.40 [J].

KUMAGAI, K ;

NAKAMURA, Y .

PHYSICA C, 1989, 157 (02) :307-314

[4] STUDIES OF 63/65CU-NQR AND ELECTRICAL-RESISTIVITY FOR THE WIDE-RANGE OF X IN LA2-XSRXCUO4 [J].

NAKAMURA, Y ;

KUMAGAI, K .

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 1989, 161 (03) :265-271

[5] OXYGEN DEFECT K2NIF4-TYPE OXIDES - THE COMPOUNDS LA2-CHISRCHICUO4-CHI-2+DELTA [J].

NGUYEN, N ;

CHOISNET, J ;

HERVIEU, M ;

RAVEAU, B .

JOURNAL OF SOLID STATE CHEMISTRY, 1981, 39 (01) :120-127

[6] OBSERVATION OF NUCLEAR-RESONANCE OF CU IN ANTIFERROMAGNETIC LA2CUO4-DELTA AND CUO [J].

TSUDA, T ;

SHIMIZU, T ;

YASUOKA, H ;

KISHIO, K ;

KITAZAWA, K .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1988, 57 (09) :2908-2911

[7] NMR AND NQR STUDIES IN HIGH-TC OXIDES - YBA2CU3OY (6.0-LESS-THAN-OR-EQUAL-TO-Y-LESS-THAN-OR-EQUAL-TO-6.91) [J].

YASUOKA, H ;

SHIMIZU, T ;

IMAI, T ;

SASAKI, S ;

UEDA, Y ;

KOSUGE, K .

HYPERFINE INTERACTIONS, 1989, 49 (1-4) :167-186

[8] COPPER NMR AND NQR IN LA2-XSRXCUO4 - NO EVIDENCE FOR COEXISTENCE OF MAGNETIC-ORDERING AND SUPERCONDUCTIVITY DOWN TO 1.3-K [J].

YOSHIMURA, K ;

IMAI, T ;

SHIMIZU, T ;

UEDA, Y ;

KOSUGE, K ;

YASUOKA, H .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1989, 58 (09) :3057-3060