Effects of Single-site Anisotropy on Mixed Diamond Chains with Spins 1 and 1/2

Details Effects of Single-site Anisotropy on Mixed Diamond Chains with Spins 1 and 1/2 Effects of Single-site Anisotropy on Mixed Diamond Chains with Spins 1 and 1/2

2011-06-20

arxiv.org/abs/1106.3846v2

J. Phys. Soc. Jpn., Vol.80, No.10, p.104710 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 4 figures

Scientific paper

10.1143/JPSJ.80.104710

Effects of single-site anisotropy on mixed diamond chains with spins 1 and 1/2 are investigated in the ground states and at finite temperatures. There are phases where the ground state is a spin cluster solid, i.e., an array of uncorrelated spin-1 clusters separated by singlet dimers. The ground state is nonmagnetic for the easy-plane anisotropy, while it is paramagnetic for the easy-axis anisotropy. Also, there are the N\'eel, Haldane, and large-$D$ phases, where the ground state is a single spin cluster of infinite size and the system is equivalent to the spin-1 Heisenberg chain with alternating anisotropy. The longitudinal and transverse susceptibilities and entropy are calculated at finite temperatures in the spin-cluster-solid phases. Their low-temperature behaviors are sensitive to anisotropy.

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