Spin-paramagnetic transition of ultrathin granular Al films in a tilted magnetic field

Document Type

Article

Publication Date

1-1-1995

Abstract

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.

Publication Source (Journal or Book title)

Physical Review B

First Page

1378

Last Page

1380

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