Incipient Ferromagnetism in Tb2Ge2O7: Application of Chemical Pressure to the Enigmatic Spin-Liquid Compound Tb2Ti2O7

CORC > 物理研究所 > 物理所公开发表论文 > 期刊论文

	Incipient Ferromagnetism in Tb2Ge2O7: Application of Chemical Pressure to the Enigmatic Spin-Liquid Compound Tb2Ti2O7
	Hallas, AM ; Cheng, JG ; Arevalo-Lopez, AM ; Silverstein, HJ ; Su, Y ; Sarte, PM ; Zhou, HD ; Choi, ES ; Attfield, JP ; Luke, GM ; Wiebe, CR
刊名	PHYSICAL REVIEW LETTERS
	2014
卷号	113 期号:26
ISSN号	0031-9007
通讯作者	Luke, GM (reprint author), McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada.
中文摘要	After nearly 20 years of study, the origin of the spin-liquid state in Tb2Ti2O7 remains a challenge for experimentalists and theorists alike. To improve our understanding of the exotic magnetism in Tb2Ti2O7, we synthesize a chemical pressure analog: Tb2Ge2O7. Substitution of titanium by germanium results in a lattice contraction and enhanced exchange interactions. We characterize the magnetic ground state of Tb2Ge2O7 with specific heat, ac and dc magnetic susceptibility, and polarized neutron scattering measurements. Akin to Tb2Ti2O7, there is no long-range order in Tb2Ge2O7 down to 20 mK. The Weiss temperature of -19.2(1) K, which is more negative than that of Tb2Ti2O7, supports the picture of stronger antiferromagnetic exchange. Polarized neutron scattering of Tb2Ge2O7 reveals that liquidlike correlations dominate in this system at 3.5 K. However, below 1 K, the liquidlike correlations give way to intense short-range ferromagnetic correlations with a length scale similar to the Tb-Tb nearest neighbor distance. Despite stronger antiferromagnetic exchange, the ground state of Tb2Ge2O7 has ferromagnetic character, in stark contrast to the pressure-induced antiferromagnetic order observed in Tb2Ti2O7.
资助信息	Vanier Canada Graduate Scholarship Program; NSERC; CRC program; CFI; EPSRC; STFC; Royal Society; NSF [DMR-1157490]; State of Florida; U.S. DOE; NSFC [11304371]; Chinese Academy of Sciences [Y2K5016X51]
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/59578]
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	Hallas, AM,Cheng, JG,Arevalo-Lopez, AM,et al. Incipient Ferromagnetism in Tb2Ge2O7: Application of Chemical Pressure to the Enigmatic Spin-Liquid Compound Tb2Ti2O7[J]. PHYSICAL REVIEW LETTERS,2014,113(26).
APA	Hallas, AM.,Cheng, JG.,Arevalo-Lopez, AM.,Silverstein, HJ.,Su, Y.,...&Wiebe, CR.(2014).Incipient Ferromagnetism in Tb2Ge2O7: Application of Chemical Pressure to the Enigmatic Spin-Liquid Compound Tb2Ti2O7.PHYSICAL REVIEW LETTERS,113(26).
MLA	Hallas, AM,et al."Incipient Ferromagnetism in Tb2Ge2O7: Application of Chemical Pressure to the Enigmatic Spin-Liquid Compound Tb2Ti2O7".PHYSICAL REVIEW LETTERS 113.26(2014).