Title

Reduced magnetic disorder at low temperature in Ca3Co2O6 via zinc substitution

Authors

Benjamin D. White, Central Washington University
Alexander B.C. Mantilla, Central Washington University
Jani Jesenovec, Central Washington University

Document Type

Article

Department or Administrative Unit

Physics

Publication Date

12-31-2019

Abstract

The compound Ca₃Co₂O₆ undergoes a transition into a spin-density wave (SDW) state near 24 K. Below ∼10 K, this unstable SDW state coexists with a nearly- degenerate commensurate antiferromagnetic state as well as short-range magnetic order. Clear signatures of this strong magnetic disorder have been observed in the response of entropy to changing magnetic field and temperature. We performed a calorimetry study of Ca₃Co₂O₆ and Ca₃Co_1.9Zn_0.1O₆ in order to compare their entropic responses at low temperature. Our results for Ca₃Co₂O₆ reveal that ΔS(T, H) ≡ S(T, H)−S(T, H = 0) increases as either temperature or magnetic field increase. In contrast, ΔS data for Ca₃Co_1.9Zn_0.1O₆ were relatively unresponsive to changes in temperature or field, suggesting that Zn substitution may reduce the low-temperature magnetic disorder observed in Ca₃Co₂O₆. These results are discussed within the context of two cases (Ca₃Co₂O₆ under applied pressure and Ca_2.75R_0.25Co₂O₆ (R = Dy, Lu)) in which a single magnetic ground state is stabilised.

Comments

This article was originally published in Philosophical Magazine. The full-text article from the publisher can be found here.

Due to copyright restrictions, this article is not available for free download from ScholarWorks @ CWU.

Recommended Citation

White, B. D., Mantilla, A. B. C., & Jesenovec, J. (2019). Reduced magnetic disorder at low temperature in Ca3Co2O6 via zinc substitution. Philosophical Magazine, 100(10), 1226–1243. https://doi.org/10.1080/14786435.2019.1708497

Journal

Philosophical Magazine