ePubs

The open archive for STFC research publications

Full Record Details

Persistent URL	http://purl.org/net/epubs/work/51070
Record Status	Checked
Record Id	51070
Title	Magnetic field resonantly enhanced free spins in heavily underdoped YBa2Cu3O6+x
Contributors	C Stock (STFC Rutherford Appleton Lab.), WJL Buyers (NRC, Chalk River), KC Rule (Helmholtz Zentrum Berlin), JH Chung (NIST Centre for Neutron Research), R Liang (British Columbia U.), D Bonn (British Columbia U.), WN Hardy (British Columbia U.)
Abstract	Using neutron scattering, we investigate the effect of a magnetic field on the static and dynamic spin response in heavily underdoped superconducting YBa2Cu3O6+x (YBCO6+x) with x=0.33 (T-c=8 K) and 0.35 (T-c=18 K). In contrast to the heavily doped and superconducting monolayer cuprates, the elastic central peak characterizing static spin correlations does not respond observably to a magnetic field which suppresses superconductivity. Instead, we find a magnetic-field-induced resonant enhancement of the spin fluctuations. The energy scale of the enhanced fluctuations matches the Zeeman energy within both the normal and vortex phases, while the momentum dependence is the same as the zero-field bilayer response. The magnitude of the enhancement is very similar in both phases with a fractional intensity change of (I/I-0-1)similar to 0.1. We suggest that the enhancement is not directly correlated with superconductivity but is the result of almost free spins located near hole-rich regions.
Organisation	ISIS , STFC
Keywords
Funding Information
Related Research Object(s):
Licence Information:
Language	English (EN)

Type	Details	URI(s)	Local file(s)	Year
Journal Article	Phys Rev B 79 (2009): 184514.	doi:10.1103/PhysRevB.79.184514		2009