Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: K1.00210 : Muon probing in optimal and under- doped GdBCO
Author:
By means of MaxEnt-Burg, transverse-field (TF) $\mu $SR data of
underdoped
($\delta $1; T$_{c }$= 81 K) and optimal doped ($\delta $0; T$_{c
}$= 93 K)
GdBa$_{2}$Cu$_{3}$O$_{7-\delta }$ (GdBCO) are analyzed. Site
search studies
for RBCO generated plausible candidates for muon sites [1] called
the Balmer
and Lin sites. We wish to confirm the muon-probe sites in
GdBCO.~One of the
two Balmer sites and the Lin site are located near O vacancies.
These two
sites become unstable in underdoped GdBCO($\delta $1). Positive
muons are
repelled by the positive O vacancies. This repulsion effects
would be more
pronounced as temperature increases.~ At 120 K, three signals are
present in
GdBCO($\delta $1), while at roomtemperature (RT), only one
dominant signal
remains. In contrast, three signals occur at 120 K and RT for
GdBCO($\delta
$0), which has much less O vacancies.~ These results support
earlier studies
[1] of muon-O sites.~Thus, the muons probe away from the
CuO$_{2}$ plane,
allowing $\mu $SR to detect magnetic fields originating from
potential loop
currents in these planes. [2] By ME-$\mu $SR analysis, the Balmer
{\&} Lin
sites in GdBCO are confirmed. Research supported by NSF-REU.
\\[0pt]
[1] WK Dawson et al, J Appl Phys 64 (1988) 5809 {\&} Hpf Int 63
(1990) 219.\\[0pt]
[2] CM Varma, PRL 83 (1999) 3538; T Songatikamas et al, J
Superconductivity and Novel Magn 23 (2010) 793.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.K1.210
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2021 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
1 Research Road, Ridge, NY 11961-2701
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700