Strong quantum fluctuations of vortex movements in Y1Ba2Cu3O7-delta ultra-thin films

Chunguang Li, Yizong He, D Jin, ZJ Chen, GC Xiong, G Lian, D Yin, S Luo, Colin Gough

Research output: Contribution to journalArticlepeer-review


Measurements of the magnetic relaxation rates S(T) and transport characteristics have been performed on Y1Ba2Cu3O7−δ (YBCO) films with thickness between 2.4 and 200nm. Strong quantum fluctuations of the vortex movements which occur at temperatures as high as 8.5∼15 K are detected in all ultra-thin films (2.4∼40nm), while the thick sample (200nm) does not show any quantum fluctuations at the experimental temperatures down to 4.2K. The experimental results are discussed with the theory based on dissipative tunneling of collectively pinned vortex. It is suggested that the strong quantum fluctuations in the ultra-thin films are due to the higher zero temperature normal state resistivity and/or the higher active energy of them compared to those of the thick sample.
Original languageEnglish
Pages (from-to)1031-1034
Number of pages4
JournalPhysica C Superconductivity
Issue numberPart 2
Publication statusPublished - 1 Nov 2000


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