Magnetization "Steps" on a Kagome Lattice in Volborthite

被引：73

作者：

Yoshida, Hiroyuki ^{[1
]}

Okamoto, Yoshihiko ^{[1
]}

Tayama, Takashi ^{[1
]}

Sakakibara, Toshiro ^{[1
]}

Tokunaga, Masashi ^{[1
]}

Matsuo, Akira ^{[1
]}

Narumi, Yasuo ^{[1
]}

Kindo, Koichi ^{[1
]}

Yoshida, Makoto ^{[1
]}

Takigawa, Masashi ^{[1
]}

Hiroi, Zenji ^{[1
]}

机构：

[1] Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2009年 / 78卷 / 04期

关键词：

kagome lattice; spin liquid; magnetization step; volborthite; HEISENBERG-ANTIFERROMAGNET; SPIN; STATE;

D O I：

10.1143/JPSJ.78.043704

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Magnetic properties of the spin-1/2 kagome-like compound volborthite are studied using a high-quality polycrystalline sample. It is evidenced from magnetization and specific heat measurements that the spins on the kagome lattice Still fluctuate at low temperature, down to T = 60 mK that corresponds to 1/1500 of the nearest-neighbor antiferromagnetic interaction, exhibiting neither a conventional long-range order nor a spin gap. In contrast, V-51 NMR experiments revealed a sharp peak at 1 K in relaxation rate, which indicates that a certain exotic order Occurs. Surprisingly, we have observed three "steps" in magnetization as a function of magnetic field, suggesting that at least four liquid-like or other quantum states exist under magnetic fields.

引用

页数：4

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