Ion-channeling studies of lattice anomalies well above T{sub c} in YBa{sub 2}Cu{sub 3}O{sub 7-y}
Journal Article
·
· Journal of Low Temperature Physics
- Hokkaido Univ., Sapporo (Japan)
Backscattering yields in the <001> axial channeling mode using D{sup +} ions have been measured for YBa{sub 2}Cu{sub 3}O{sub 7{minus}y} single crystals with T{sub c} = 59K, 68K and 91K at temperatures, between 40K and 295K. In 60 K-class YBa{sub 2}Cu{sub 3}O{sub 7{minus}y} with significant anomalies associated with the spin gap, it is found that the channeling anomalies are observed at 130-140 K(T{sub pa}) in addition to anomalies at T{sub c}. The channeling anomalies at T{sub c} follow to the shift of T{sub c}, suggesting the phonon anomalies induced by the superconducting-gap opening. On the other hand, T{sub pa} is found to be almost unchanged for varying T{sub c}, although T{sub pa}, appears near the temperature where the spin gap is opened. This leads to a question whether the channeling anomalies at T{sub pa} is directly related to the phonon anomalies induced by the spin-gap opening. The existence of lattice instability is suggested as one of the possible explanations for the anomalies at T{sub pa}.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 457244
- Report Number(s):
- CONF-960808--
- Journal Information:
- Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 3-4 Vol. 105; ISSN JLTPAC; ISSN 0022-2291
- Country of Publication:
- United States
- Language:
- English
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