Quantum spin excitations through the metal-to-insulator crossover in YBa(2)Cu(3)O(6+y)

	Quantum spin excitations through the metal-to-insulator crossover in YBa(2)Cu(3)O(6+y)
	Li, SL ; Yamani, Z ; Kang, HJ ; Segawa, K ; Ando, Y ; Yao, X ; Mook, HA ; Dai, PC
刊名	PHYSICAL REVIEW B
	2008
卷号	77 期号:1
关键词	TRANSITION-TEMPERATURE SUPERCONDUCTOR MAGNETIC EXCITATIONS LA2-XSRXCUO4 DYNAMICS STRIPES PR0.88LACE0.12CUO4-DELTA STATE
ISSN号	1098-0121
通讯作者	Li, SL (reprint author), Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA.
中文摘要	We use inelastic neutron scattering to study the temperature dependence of the spin excitations of a detwinned superconducting YBa(2)Cu(3)O(6.45) (T(c)=48 K). In contrast to earlier work on YBa(2)Cu(3)O(6.5) (T(c)=58 K), where the prominent features in the magnetic spectra consist of a sharp collective magnetic excitation termed "resonance" and a large (h omega approximate to 15 meV) superconducting spin gap, we find that the spin excitations in YBa(2)Cu(3)O(6.45) are gapless and have a much broader resonance. Our detailed mapping of magnetic scattering along the a()/b()-axis directions at different energies reveals that spin excitations are unisotropic and consistent with the "hourglasslike" dispersion along the a(*)-axis direction near the resonance, but they are isotropic at lower energies. Since a fundamental change in the low-temperature normal state of YBa(2)Cu(3)O(6+y) when superconductivity is suppressed takes place at y similar to 0.5 with a metal-to-insulator crossover (MIC), where the ground state transforms from a metallic to an insulatinglike phase, our results suggest a clear connection between the large change in spin excitations and the MIC. The resonance therefore is a fundamental feature of metallic ground state superconductors and a consequence of high-T(c) superconductivity.
收录类别	SCI
语种	英语
公开日期	2014-02-20
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/57848]
专题	物理研究所_所内人员在其他单位发表论文题录信息_所内人员在其他单位发表论文题录信息_期刊论文
推荐引用方式 GB/T 7714	Li, SL,Yamani, Z,Kang, HJ,et al. Quantum spin excitations through the metal-to-insulator crossover in YBa(2)Cu(3)O(6+y)[J]. PHYSICAL REVIEW B,2008,77(1).
APA	Li, SL.,Yamani, Z.,Kang, HJ.,Segawa, K.,Ando, Y.,...&Dai, PC.(2008).Quantum spin excitations through the metal-to-insulator crossover in YBa(2)Cu(3)O(6+y).PHYSICAL REVIEW B,77(1).
MLA	Li, SL,et al."Quantum spin excitations through the metal-to-insulator crossover in YBa(2)Cu(3)O(6+y)".PHYSICAL REVIEW B 77.1(2008).