INTERPRETATION OF THE MAGNETIC SPECIFIC-HEAT OF OXYGEN-DEFICIENT AND DOPED NDBA2CU3OX AND DYBA2CU3OX COMPOUNDS

被引：10

作者：

ALLENSPACH, P

MAPLE, MB

FURRER, A

机构：

[1] UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093

[2] ETH ZURICH,NEUTRON SCATTERING LAB,CH-5232 VILLIGEN,SWITZERLAND

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 1994年 / 207卷

关键词：

D O I：

10.1016/0925-8388(94)90208-9

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In contrast to NdBa2Cu3Ox samples with x close to 7 and 6 which according to neutron diffraction and specific heat measurements exhibits long-range antiferromagnetic ordering of the Nd3+ ions, only short-range magnetic ordering has been found in the intermediate oxygen range 6.9 greater than or similar to x greater than or similar to 6.6. The short-range ordering behavior of the magnetic specific heat is neither of one-dimensional chain-type nor two-dimensional XY or Heisenberg type, but could be explained by two-dimensional Heisenberg spin-1/2 clusters. A two-dimensional Ising cluster model was applied to DyBa2Cu3Ox in order to account for the high single ion anisotropy of Dy3+; this model reproduces the zero magnetic field specific heat data but does not agree as well as the Heisenberg model with the data taken in an external magnetic field.

引用

页码：213 / 220

页数：8

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