Interplay between Co 3d and Ce 4f magnetism in CeCoAsO

被引：20

作者：

Sarkar, Rajib ^{[1
]}

Jesche, Anton ^{[1
]}

Krellner, Cornelius ^{[1
]}

Baenitz, Michael ^{[1
]}

Geibel, Cristoph ^{[1
]}

Mazumdar, Chandan ^{[2
]}

Poddar, Asok ^{[2
]}

机构：

[1] Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany

[2] Saha Inst Nucl Phys, ECMP Div, Kolkata 700064, W Bengal, India

来源：

PHYSICAL REVIEW B | 2010年 / 82卷 / 05期

关键词：

SUPERCONDUCTIVITY; HEAT;

D O I：

10.1103/PhysRevB.82.054423

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have investigated the ground-state properties of polycrystalline CeCoAsO by means of magnetization, specific heat, and solid-state NMR. Susceptibility and specific-heat measurements suggest a ferromagnetic order at about, T-C=75 K. No further transitions are found down to 0.5 K. At 6.5 K a complex Schottky type of anomaly shows up in the specific-heat results. The interplay between Ce 4f and Co 3d magnetism being responsible for that anomaly is discussed. Furthermore As-75-NMR investigations have been performed to probe the magnetism on a microscopic scale. As-NMR spectra are analyzed in terms of first and second-order quadrupolar interaction. The anisotropic shift component K-ab and K-c could be derived from the As-75 powder spectra. Towards lower temperature a strong shift anisotropy was found. Nonetheless K-iso tracks the bulk susceptibility down to T=50 K very well. Furthermore the presence of weak correlations among the Ce ions in the ferromagnetic state is discussed. The observed increase in C/T towards lower temperatures supports this interpretation.

引用

页数：6

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