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63Cu NQR evidence for spatial variation of hole concentration in La2-xSrxCuO4.
Phys Rev Lett
January 2002
Department of Physics and Center for Materials Science and Engineering, M.I.T., Cambridge, Massachusetts 02139, USA.
We report experimental evidence for the spatial variation of hole concentration x(hole) in the high T(c) superconductor La2-xSrxCuO4 ( 0.04 < or = x < or = 0.16) via 63Cu NQR using 63Cu isotope enriched samples.
View Article and Find Full Text PDFOxygen-isotope effect on the In-plane penetration depth in underdoped La2-xSrxCuO4 single crystals.
Phys Rev Lett
May 2000
Physik-Institut der Universitat Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland.
We report measurements of the oxygen-isotope effect (OIE) on the in-plane penetration depth lambda(ab)(0) in underdoped La2-xSrxCuO4 single crystals. A highly sensitive magnetic torque sensor with a resolution of Deltatau approximately 10(-12) N m was used for the magnetic measurements on microcrystals with a mass of approximately 10 &mgr;g. The OIE on lambda(-2)(ab)(0) is found to be -10(2)% for x = 0.
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