First-order spin-paramagnetic transition and tricritical point in ultrathin Be films

被引：36

作者：

Adams, PW ^{[1
]}

Herron, P

Meletis, EI

机构：

[1] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA

[2] Louisiana State Univ, Dept Mech Engn, Mat Sci & Engn Program, Baton Rouge, LA 70803 USA

来源：

PHYSICAL REVIEW B | 1998年 / 58卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.58.R2952

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report measurements of the parallel critical magnetic field of thin superconducting beryllium films with T(c)similar to 0.6 K. The critical field transitions were spin-paramagnetically limited and found to be strongly hysteretic below a tricritical point at T-tri= 190 mK. The magnitude of the hysteresis and T-tri were observed to be completely suppressed in field misalignments theta greater than or equal to 1 degrees. Time relaxation measurements in the hysteretic regime showed simple exponential decays in the highest quality films and nonexponential decays interspersed with avalanches in more inhomogeneous samples.

引用

页码：R2952 / R2955

页数：4

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