VARIATION OF ANTIFERROMAGNETIC PR ORDERING IN THE TL(BA1-XSRX)2PRCU2O7-DELTA SYSTEM

被引：33

作者：

LAI, CC ^{[1
]}

LEE, TJ ^{[1
]}

FUN, HK ^{[1
]}

KU, HC ^{[1
]}

HO, JC ^{[1
]}

机构：

[1] WICHITA STATE UNIV,DEPT PHYS,WICHITA,KS 67260

来源：

PHYSICAL REVIEW B | 1994年 / 50卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.50.4092

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Structural, magnetic, calorimetric, and transport studies have been made on a synthesized Tl(1212) system of Tl(Ba1-xSrx)2PrCu2O7-delta(0 less-than-or-equal-to x less-than-or-equal-to 1). Based on x-ray Rietveld refinement data, the bond length between Pr and oxygen in the adjacent CuO2 layers increases with increasing x, even though the tetragonal lattice parameters decrease with progressive Sr substitution. This may result in a lower degree of hybridization between extended Pr 4f and O 2p pi orbitals and a corresponding reduction of superexchange magnetic coupling strength among Pr moments. Indeed, the anomalously high Neel temperature T(N)(Pr) decreases from 8.0-8.2 K for x = 0 to 3.6-4.2 K for x = 1. The magnetic entropy associated with this antiferromagnetic Pr ordering is estimated from specific-heat data, in which a heavy-fermion-like contribution also prevails.

引用

页码：4092 / 4096

页数：5

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