Continuous magnetic phase transition in half-frustrated Ca2Os2O7

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	Continuous magnetic phase transition in half-frustrated Ca2Os2O7
	Zheng, P ; Shi, YG ; Wu, QS ; Xu, G ; Dong, T ; Chen, ZG ; Yuan, RH ; Cheng, B ; Yamaura, K ; Luo, JL ; Wang, NL
刊名	PHYSICAL REVIEW B
	2012
卷号	86 期号:19
关键词	PYROCHLORE
ISSN号	1098-0121
通讯作者	Zheng, P: Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, POB 603, Beijing 100080, Peoples R China.
中文摘要	We present the specific heat, magnetization, optical spectroscopy measurements, and the first-principles calculations on the Weberite structure Ca2Os2O7 single-crystal/polycrystalline sample. The Ca2Os2O7 shows a Curie-Weiss nature at high temperature and goes into a ferrimagnetic insulating state at 327 K on cooling. A lambda-like peak is observed at 327 K in the specific heat implying a second-order phase transition. The vanishing electronic specific heat at low temperature suggests a full energy gap. At high temperature above the transition, a small amount of itinerant carriers with short life time tau is observed, which is gapped at 20 K with a direct gap of 0.24 eV. Our first-principles calculations indicate that the antiferromagnetic (AFM) correlation with intermediate Coulomb repulsion U could effectively split Os(4b) t(2g) bands and push them away from Fermi level (E-F). On the other hand, a noncollinear magnetic interaction is needed to push the Os(4c) bands away from E-F, which could be induced by Os(4c)-Os(4c) frustration. Therefore, AFM correlation, Coulomb repulsion U and noncollinear interaction all play important roles for the insulating ground state in Ca2Os2O7.
收录类别	SCI
资助信息	National Science Foundation of China [10834013, 10874213]; Ministry of Science and Technology of China; Japan Society for the Promotion of Science [22246083]
语种	英语
公开日期	2013-09-17
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/35066]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Zheng, P,Shi, YG,Wu, QS,et al. Continuous magnetic phase transition in half-frustrated Ca2Os2O7[J]. PHYSICAL REVIEW B,2012,86(19).
APA	Zheng, P.,Shi, YG.,Wu, QS.,Xu, G.,Dong, T.,...&Wang, NL.(2012).Continuous magnetic phase transition in half-frustrated Ca2Os2O7.PHYSICAL REVIEW B,86(19).
MLA	Zheng, P,et al."Continuous magnetic phase transition in half-frustrated Ca2Os2O7".PHYSICAL REVIEW B 86.19(2012).