Static magnetic moments revealed by muon spin relaxation and thermodynamic measurements in the quantum spin ice Yb2Ti2O7

被引：42

作者：

Chang, Lieh-Jeng ^{[1
]}

Lees, Martin R. ^{[2
]}

Watanabe, Isao ^{[3
]}

Hillier, Adrian D. ^{[4
]}

Yasui, Yukio ^{[5
]}

Onoda, Shigeki ^{[6
,7
]}

机构：

[1] Natl Cheng Kung Univ, Dept Phys, Tainan 70101, Taiwan

[2] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England

[3] RIKEN, Adv Meson Sci Lab, Nishina Ctr, Wako, Saitama 3510198, Japan

[4] Rutherford Appleton Lab, ISIS Facil, Chilton OX11 0QX, Oxon, England

[5] Meiji Univ, Dept Phys, Kawasaki, Kanagawa 2148571, Japan

[6] RIKEN, Condensed Matter Theory Lab, Wako, Saitama 3510198, Japan

[7] RIKEN, Ctr Emergent Matter Sci, Quantum Matter Theory Res Team, Wako, Saitama 3510198, Japan

来源：

PHYSICAL REVIEW B | 2014年 / 89卷 / 18期

基金：

英国工程与自然科学研究理事会;

关键词：

TRANSITION;

D O I：

10.1103/PhysRevB.89.184416

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present muon spin relaxation (mu SR) and specific-heat versus temperature C(T) measurements on polycrystalline and single-crystal samples of the pyrochlore magnet Yb2Ti2O7. C(T) exhibits a sharp peak at a T-C of 0.21 and 0.26 K for the single-crystal and polycrystalline samples, respectively. For both samples, the magnetic entropy released between 50 mK and 30 K amounts to R ln 2 per Yb. At temperatures below T-C we observe a steep drop in the asymmetry of the zero-field mu SR time spectra at short time scales, as well as a decoupling of the muon spins from the internal field in longitudinal magnetic fields of <= 0.25 T for both the polycrystalline and single-crystal samples. These muon data are indicative of static magnetic moments. Our results are consistent with the onset of long-range magnetic order in both forms of Yb2Ti2O7.

引用

页数：5

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