I don't recall seeing one but you can model it on the Undead spells.
I have developed the spell below for use by paladins as well.
CIRCLE OF WARDING
PP Cost: 8
Range: Touch
Duration: 5 rounds / rank
Area: 20' Radius
Spell Type: Attack
RR: Stamina
Aspects: Control / Mind, Cloud
Spheres: Paladin
DESCRIPTION
Caster creates an area where beings with the specified alignment cannot enter or pass through without passing a Will RR (50 + Caster Level * 5). When casting the spell the caster must specify a single alignment.
The circle, once cast, is anchored to that point and may be freely left or entered by anyone, including the caster.
SCALING OPTIONS
Increase Duration to 10 rounds / rank +6 PP
per 10' radius increase (max 50') +2 PP
Increase Duration to 1 minute / rank +8 PP
Increase Range to 10' +2 PP
Increase duration to 10 minutes / rank +9 PP
Increase Range to 50' +2 PP