Specific heat and transport study of the co-existence of charge-density-wave and weak ferromagnetism in BaIrO3

Kini, N. S. ; Bentien, A. ; Ramakrishnan, S. ; Geibel, C. (2005) Specific heat and transport study of the co-existence of charge-density-wave and weak ferromagnetism in BaIrO3 Physica B: Condensed Matter, 359-361 . pp. 1264-1266. ISSN 0921-4526

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.physb.2005.01.395

Abstract

Monoclinic BaIrO3 was reported to display simultaneous onset of charge density wave transition (CDW) and weak ferromagnetic ordering of Ir moments at Tc=175 K. In this work, we present heat capacity, resistivity, thermopower and thermal conductivity measurements on a high-quality polycrystalline BaIrO3 sample. The specific heat evidences a well defined mean field like anomaly, much larger than that reported for a single crystal, and at a slightly higher Tc=183 K. The increase of the resistivity below Tc is also much larger than in previous investigation, and the semiconducting behavior at low temperature is much more pronounced. The onset of the CDW leads to a strong increase of the thermopower, from a few μV/K above Tc up to nearly 300μV/K at 70 K, supporting a strong decrease of the charge carrier density and the opening of a gap at Tc. In contrast, no anomaly is observed at Tc in the thermal conductivity, which is dominated by phonon contributions.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Charge Density Wave; Weak Ferromagnetism; Barium Iridium Oxide
ID Code:68539
Deposited On:05 Nov 2011 06:15
Last Modified:05 Nov 2011 06:15

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