Commensurability oscillations and a new phase transition in YBa2Cu3Oy single crystals |
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| Authors: | A. A. Zhukov M. G. Mikheev V. I. Voronkova K. I. Kugel’ A. L. Rakhmanov H. Küpfer T. Wolf G. K. Perkins A. D. Caplin |
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| Affiliation: | (1) M. V. Lomonosov Moscow State University, 119899 Moscow, Russia;(2) Scientific-Research Center of Applied Electrodynamics, Russian Academy of Sciences, 127412 Moscow, Russia;(3) Forschungszentrum Karlsruhe, Institut für Technische Physik, D-76021 Karlsruhe, Germany;(4) Centre for High Temperature Superconductivity, Blackett Laboratory, Imperial College, London, SW7 2BZ, United Kingdom |
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| Abstract: | Magnetization oscillations due to the commensurability of the vortex and crystal lattice periods in YBa2Cu3Oy (y=6.97±0.02) single crystals are investigated using a high angular resolution magnetometer. A sharp peak in the temperature dependence of the oscillation amplitude as well as other features in the behavior of the oscillation amplitude and of the irreversible magnetization are observed at T f ∼60 K. It is inferred that T f is the temperature of a transition of the solid vortex state to a smectic phase. Pis’ma Zh. éksp. Teor. Fiz. 69, No. 11, 832–837 (10 June 1999) |
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