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arXiv 1001.2601cond-mat.str-el
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用μ子自旋转动研究Tl(Cu $_{0.985}$ Mg $_{0.015}$)Cl $_3$中压力诱导的新磁相

Pressure-induced new magnetic phase in Tl(Cu$_{0.985}$Mg$_{0.015}$)Cl$_3$ probed by muon spin rotation

Takao Suzuki, Isao Watanabe, Fumiko Yamada, Motoki Yamada, Yasuyuki Ishii, Takayuki Kawamata, Takayuki Goto, Hidekazu Tanaka

摘要:

在流体静压下对掺杂量子自旋能隙体系Tl(Cu $_{0.985}$ Mg $_{0.015}$)Cl $_3$进行了零场μ子自旋转动(ZF-$μ$ SR)测量,研究了压致相的微观磁性.自发μ子自旋进动,这表明存在一个长程相干秩序,观察到的压力。在3.1 kbar温度范围内,μ子位{ \it H} $_{\rm int}$的内部静磁场在4 K附近趋于饱和,达到280 Oe,而在2.3 K时则下降到240 Oe。这些结果表明有序自旋的重排,我们推测,斜反铁磁相,这是观察到的纯TlCuCl $_3$在14 kbar的压力,出现在Mg掺杂系统在较低的压力。

英文摘要:

We carried out zero-field muon-spin-rotation (ZF-$μ$SR) measurements in hydrostatic pressures in impurity-doped quantum spin gap system Tl(Cu$_{0.985}$Mg$_{0.015}$)Cl$_3$ to investigate microscopic magnetic properties of the pressure-induced phase. The spontaneous muon spin precession, which indicates the existence of a long-range coherent order, is observed in pressures. With decreasing temperature in 3.1 kbar, the internal static magnetic field at the muon sites {\it H}$_{\rm int}$ tends to saturate to 280 Oe around 4 K, however, decreases to 240 Oe at 2.3 K. These results suggest a rearrangement of ordered spins, and we speculate that the oblique antiferromagnetic phase, which is observed in the pressure of 14 kbar on the pure TlCuCl$_3$, appears in the Mg-doped system in lower pressures.

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