Site-selective oxygen isotope shift in YBa{sub 2}Cu{sub 3}O{sub 7}

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:68438

Nickel, J H ^[1]; Morris, D E ^[2]; Ager, III, J W ^[3]

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1. Los Alamos National Laboratory, NM (United States)
2. Morris Research, Inc., Berkeley, CA (United States)
3. Lawrence Berkeley Laboratory, CA (United States)

YBa{sub 2}Cu{sub 3}O{sub 7}(123) has four inequivalent oxygen sites: the CuO chain sites [O1], the edge sharing apical sites [O4] and the CuO{sub 2} plane sites [O2,O3]. In all previous isotope shift experiments, isotopic substition was nearly complete and uniform among the different oxygen sites. The measured oxygen isotope shift is {Delta}T{sub c} = 0.2K for uniform {sup 18}O occupation. These studies could not distinguish the contributions of the different oxygen sites to the oxygen isotope effect. The authors have measured the site selective oxygen isotope shift (SS-OIS) of 123 samples containing {approximately} 95% {sup 18}O in the CuO{sub 2} plane sites and primarily {sup 16}O in the apical and chain sites.

• Research Organization: Los Alamos National Lab., NM (United States)
• OSTI ID: 68438
• Report Number(s): LA-UR--94-1148; CONF-931247--; ON: DE94009293
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
BARIUM OXIDES
COPPER OXIDES
HIGH-TC SUPERCONDUCTORS
ISOTOPIC EXCHANGE
OXYGEN 18
SPECTRAL SHIFT
TRANSITION TEMPERATURE
YTTRIUM OXIDES