Campus Units

Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Submitted Manuscript

Publication Date

5-2014

Journal or Book Title

Journal of Magnetism and Magnetic Materials

Volume

358-359

First Page

212

Last Page

227

DOI

10.1016/j.jmmm.2014.01.072

Abstract

Single crystals of RCO2Ge2 (R=Y, La-Nd, Sm-Tm) were grown using a self flux method and were characterized by room temperature powder X-ray diffraction; anisotropic, temperature and field dependent magnetization; temperature and field dependent, in plane resistivity; and specific heat measurements. In this series, the majority of the moment bearing members order antiferromagnetically; YCO2Ge2 and LaCo2Ge2 are non-moment-bearing. Ce is trivalent in CeCo2Ge2 at high temperatures, and exhibits an enhanced electronic specific heat coefficient due to the Kondo effect at low temperatures. In addition, CeCo2Ge2 shows two low temperature anomalies in temperature dependent magnetization and specific heat measurements. Three members (R=Tb-Ho) have multiple phase transitions above 1.8 K. Eu appears to be divalent with total angular momentum L=0. Both EuCo2Ge2 and GclCo(2)Ge(2) manifest essentially isotropic paramagnetic properties consistent with J=S=7/12. Clear magnetic anisotropy for rare-earth members with finite L was observed, with ErCo2Ge2 and TrnCo(2)Ge(2) manifesting planar anisotropy and the rest members manifesting axial anisotropy. The experimentally estimated crystal electric field (CU) parameters.89 were calculated from the anisotropic paramagnetic 0,a, and 0, values and follow a trend that agrees well with theoretical predictions. The ordering temperatures, TN, as well as the polycrystalline averaged paramagnetic Curie-Weiss temperature, for the heavy rareearth members deviate from the de Gennes scaling, as the magnitude of both is the highest for Tb, which is sometimes seen for extremely axial systems. Except for SmCo2Ge2, metamagnetic transitions were observed at 1.8 K for all members that ordered antiferromagnetically.

Comments

This is a manuscript of an article published as Kong, Tai, Charles E. Cunningham, Valentin Taufour, Sergey L. Bud, Malinda LC Buffon, Xiao Lin, Heather Emmons, and Paul C. Canfield. "Thermodynamic and transport properties of single crystalline RCo2Ge2 (R= Y, La–Nd, Sm–Tm)." Journal of Magnetism and Magnetic Materials 358 (2014): 212-227. DOI: 10.1016/j.jmmm.2014.01.072. Posted with permission.

Copyright Owner

Elsevier B.V.

Language

en

File Format

application/pdf

Published Version

Share

COinS