SPIN-PARAMAGNETIC TRANSITION OF ULTRATHIN GRANULAR AL FILMS IN A TILTED MAGNETIC-FIELD

被引:14
作者
WU, WH
GOODRICH, RG
ADAMS, PW
机构
[1] Department of Physics and Astronomy, Louisiana State University, Baton Rouge
关键词
D O I
10.1103/PhysRevB.51.1378
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We report measurements of the critical fields of ultrathin granular Al films as a function of temperature and magnetic-field orientation. Due to the spin-paramagnetic effect, the parallel field (θ=0°) transition becomes first-order and strongly hysteretic below a tricritical point, Ttri∼270 mK. Well below Ttri, the width of the hysteresis collapses according to ΔH(θ)=ΔH(0°)exp(-θ/2.4°) with increasing θ. Our data suggest that the zero-temperature transition goes from first order to second order at θ6.5°. © 1995 The American Physical Society.
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页码:1378 / 1380
页数:3
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