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

doi:10.1016/S0921-4534(00)00770-X

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 journal › Article › peer-review

Abstract

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 language	English
Pages (from-to)	1031-1034
Number of pages	4
Journal	Physica C Superconductivity
Volume	341-8
Issue number	Part 2
DOIs	https://doi.org/10.1016/S0921-4534(00)00770-X
Publication status	Published - 1 Nov 2000

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title = "Strong quantum fluctuations of vortex movements in Y1Ba2Cu3O7-delta ultra-thin films",

abstract = "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.",

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

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doi = "10.1016/S0921-4534(00)00770-X",

language = "English",

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TY - JOUR

T1 - Strong quantum fluctuations of vortex movements in Y1Ba2Cu3O7-delta ultra-thin films

AU - Li, Chunguang

AU - He, Yizong

AU - Jin, D

AU - Chen, ZJ

AU - Xiong, GC

AU - Lian, G

AU - Yin, D

AU - Luo, S

AU - Gough, Colin

PY - 2000/11/1

Y1 - 2000/11/1

N2 - 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.

AB - 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.

U2 - 10.1016/S0921-4534(00)00770-X

DO - 10.1016/S0921-4534(00)00770-X

M3 - Article

SN - 0921-4534

VL - 341-8

SP - 1031

EP - 1034

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - Part 2

ER -

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

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