STRUCTURES AND ANTIFERROMAGNETIC PR ORDERING MECHANISM OF TL(BA2-XSRX)PRCU2O7-Y COMPOUNDS BY RIETVELD ANALYSIS

被引：5

作者：

FUN, HK

YANG, P

LAI, CC

KU, HC

LEE, TJ

机构：

[1] NANJING UNIV,NATL LAB SOLID STATE MICROSTRUCT PHYS,NANJING 210008,PEOPLES R CHINA

[2] NATL CHIAOTUNG UNIV,INST ELECTR,HSINCHU 30039,TAIWAN

[3] NATL TSINGHUA UNIV,DEPT PHYS,HSINCHU 30043,TAIWAN

来源：

PHYSICA C | 1994年 / 223卷 / 3-4期

关键词：

12;

D O I：

10.1016/0921-4534(94)91271-8

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The crystalline structures of Tl(Ba2-xSrx)PrCu2O7-x (x=0, 0.4, 0.8, 1.0, 1.2, 1.6, 2) were obtained at room temperature (300 K) and low temperature (100 K) from X-ray powder diffraction with Cu Kalpha radiation using Rietveld analysis. Tl(Ba2-xSrx)PrCu2O7-x has an isotypical structure with TlBa2CaCu2O7(1212) at 300 and 100 K, i.e., the tetragonal system, space group P4/mmm, Z=1. The relationships between the Pr-O(1) bond lengths and the O(1)-Pr-O(1) bond angles with the antiferromagnetic ordering temperature T(n) (Neel temperature) are discussed. The mechanism of the decrease in the antiferromagnetic ordering temperature T(n) as well as the nonsuperconductivity of this system are explained using the Pr(4f) and O(2p) orbital hybridization and the Pr-O(1) bond lengths. The suggested mechanism of Pr-Pr coupling (interplanar Pr-Pr distance) for the Pr ordering by a previous study is inconsistent with our experimental results.

引用

页码：267 / 275

页数：9

共 12 条

[1] UNUSUAL ELECTRONIC-STRUCTURE OF PRBA2CU3O7 [J].

FEHRENBACHER, R ;

RICE, TM .

PHYSICAL REVIEW LETTERS, 1993, 70 (22) :3471-3474

[2]

FUN HK, UNPUB POWDER DIFFRAC

[3]

KU HC, 1993, CHINESE J LOW TEMPER, V15, P13

[4] ANOMALOUS PR ORDERING IN THE NEW TLBA2PRCU2O7-DELTA COMPOUND [J].

LAI, CC ;

CHIOU, BS ;

CHEN, YY ;

HO, JC ;

KU, HC .

PHYSICA C, 1992, 202 (1-2) :104-108

[5]

LAI CC, 1993, THESIS NATIONAL CHIA

[6]

LEE TJ, IN PRESS CHINESE J P

[7] NON-SUPERCONDUCTING TLBA2YCU2O7 WITH A NEW CRYSTAL-STRUCTURE RESEMBLING SUPERCONDUCTING YBA2CU3O7 [J].

MANAKO, T ;

SHIMAKAWA, Y ;

KUBO, Y ;

SATOH, T ;

IGARASHI, H .

PHYSICA C, 1988, 156 (02) :315-318

[8] PARST - A SYSTEM OF FORTRAN ROUTINES FOR CALCULATING MOLECULAR-STRUCTURE PARAMETERS FROM RESULTS OF CRYSTAL-STRUCTURE ANALYSES [J].

NARDELLI, M .

COMPUTERS & CHEMISTRY, 1983, 7 (03) :95-98

[9]

POOLE CP, COPPER OXIDE SUPERCO, P89

[10]

SAKTHIVEL A, 1991, USERS GUIDE PROGRAMS

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