Quantum fluctuations in the dressed vacuum of a bosonic model system

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	Quantum fluctuations in the dressed vacuum of a bosonic model system
	Wagner, RE ; Acosta, S ; Glasgow, SA ; Su, Q ; Grobe, R
刊名	JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
	2012
卷号	45 期号:27
关键词	FIELD THEORY OPERATORS CUTOFFS
ISSN号	1751-8113
通讯作者	Wagner, RE (reprint author), Illinois State Univ, Intense Laser Phys Theory Unit, Normal, IL 61790 USA.
中文摘要	The surprisingly rapid relaxation of the sustainable current density in the critical state of single-crystalline Ba1-xKxFe2As2 is investigated for magnetic fields oriented parallel to the c axis and to the ab plane, respectively. Due to the inadequacy of standard analysis procedures developed for flux creep in the high-temperature superconducting cuprates, we develop a simple, straightforward data treatment technique that reveals the creep mechanism and the creep exponent mu. At low magnetic fields, below the second magnetization peak, mu varies only slightly as a function of temperature and magnetic flux density B. From the data, we determine the temperature and field dependencies of the effective activation barrier for creep. At low temperatures, the measured current density approaches the zero-temperature critical current density (in the absence of creep) to within a factor 2, thus lending credence to earlier conclusions drawn with respect to the pinning mechanism. The comparable values of the experimental screening current density and the zero-temperature critical current density reveal the limited usefulness of the widely used "interpolation formula."
收录类别	SCI
资助信息	NSF [PHY-0970065, PHY-1067189]; NSFC [11128409]
语种	英语
公开日期	2013-09-24
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/51676]
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	Wagner, RE,Acosta, S,Glasgow, SA,et al. Quantum fluctuations in the dressed vacuum of a bosonic model system[J]. JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL,2012,45(27).
APA	Wagner, RE,Acosta, S,Glasgow, SA,Su, Q,&Grobe, R.(2012).Quantum fluctuations in the dressed vacuum of a bosonic model system.JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL,45(27).
MLA	Wagner, RE,et al."Quantum fluctuations in the dressed vacuum of a bosonic model system".JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL 45.27(2012).