Specific heat study of geometrically frustrated magnet clinoatacamite Cu2Cl(OH)3

Hiroki Morodomi, Koichiro Ienaga, Yuji Inagaki, Tatsuya Kawae, Masayuki Hagiwara, X. G. Zheng

Research output: Contribution to journalConference article

5 Citations (Scopus)

Abstract

We have performed the specific heat study in a new geometrically frustrated system, clinoatacamite Cu2Cl(OH)3 with the corner-sharing tetrahedron structure of the Cu2+ ions with S=1/2 Heisenberg spin. At H=0 T, two anomalies are observed at T1=18.1 K and at T 2=6.2 K. The specific heat decreases rapidly below T2 and shows no anomaly down to T=150 mK despite the existence of the spin fluctuation shown in the μSR experiments. As the magnetic field is increased, the sharp peak at T2 is broadened and shows a small reentrant behavior in the T - H phase diagram. On the other hand, the peak at T1 shows no obvious change up to H=5 T. The entropy at T1 is estimated as ∼0.35Rln2 at H=0 T. These features may be caused by the two dimensional nature of the kagome antiferromagnets which are weakly coupled via Cu 2+ ions at the triangular sites located in between the kagome layers.

Original languageEnglish
Article number032047
JournalJournal of Physics: Conference Series
Volume200
Issue numberSECTION 3
DOIs
Publication statusPublished - Jan 1 2010

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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