Abstract
We report direct evidence of surface barriers in single crystals of Tl2Ba2CuO6 superconductors. Magnetization is measured as a function of temperature with magnetic field applied parallel to the c axis. For small field, a characteristic linear increase in M is observed at an onset temperature T1. For higher magnetic field, a new feature at low T is observed in the M(T) data. The flux penetration temperature is retarded to a higher temperature. The penetration field Hp at temperature below 50 K determined by the first linear rise in M(T) can be fitted with the relation Hp(T)=Hcexp(-T/T0), consistent with a model where two-dimensional pancakes penetrate the Bean-Livingston barrier by thermal activation. The low critical field Hc1 determined from the bulk penetration of vortices is also presented.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 5535-5538 |
| Number of pages | 4 |
| Journal | Physical Review B |
| Volume | 47 |
| Issue number | 9 |
| DOIs | |
| State | Published - Jan 1 1993 |
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ASJC Scopus subject areas
- Condensed Matter Physics
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Evidence of surface barriers in single-crystal Tl2Ba2CuO6 superconductors. / Zuo, Fulin; Vacaru, D.; Duan, H. M.; Hermann, A. M.
In: Physical Review B, Vol. 47, No. 9, 01.01.1993, p. 5535-5538.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Evidence of surface barriers in single-crystal Tl2Ba2CuO6 superconductors
AU - Zuo, Fulin
AU - Vacaru, D.
AU - Duan, H. M.
AU - Hermann, A. M.
PY - 1993/1/1
Y1 - 1993/1/1
N2 - We report direct evidence of surface barriers in single crystals of Tl2Ba2CuO6 superconductors. Magnetization is measured as a function of temperature with magnetic field applied parallel to the c axis. For small field, a characteristic linear increase in M is observed at an onset temperature T1. For higher magnetic field, a new feature at low T is observed in the M(T) data. The flux penetration temperature is retarded to a higher temperature. The penetration field Hp at temperature below 50 K determined by the first linear rise in M(T) can be fitted with the relation Hp(T)=Hcexp(-T/T0), consistent with a model where two-dimensional pancakes penetrate the Bean-Livingston barrier by thermal activation. The low critical field Hc1 determined from the bulk penetration of vortices is also presented.
AB - We report direct evidence of surface barriers in single crystals of Tl2Ba2CuO6 superconductors. Magnetization is measured as a function of temperature with magnetic field applied parallel to the c axis. For small field, a characteristic linear increase in M is observed at an onset temperature T1. For higher magnetic field, a new feature at low T is observed in the M(T) data. The flux penetration temperature is retarded to a higher temperature. The penetration field Hp at temperature below 50 K determined by the first linear rise in M(T) can be fitted with the relation Hp(T)=Hcexp(-T/T0), consistent with a model where two-dimensional pancakes penetrate the Bean-Livingston barrier by thermal activation. The low critical field Hc1 determined from the bulk penetration of vortices is also presented.
UR - http://www.scopus.com/inward/record.url?scp=0008695023&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0008695023&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.47.5535
DO - 10.1103/PhysRevB.47.5535
M3 - Article
AN - SCOPUS:0008695023
VL - 47
SP - 5535
EP - 5538
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 2469-9950
IS - 9
ER -