You should speak to the landlord and an attorney. It is highly possible you do not have the authority to seek eviction of your roommate.
It is common for roommates (Co-Tenants) to have difficulties and decide that they can no longer live together. Preemptively, you signed the lease a co-tenants not as a tenant and subtenant. As Co-Tenants only your landlord can evict either of you. Your verbal contract may provide you some defense if you were to move-out and your roommate were to pursue you for your portion of the rent but will not likely allow you to evict your roommate because he or she has an obligation to the landlord.
Your landlord may elect to allow one or both of you to walk or to find a replacement but he or she is not obligated to allow this.
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As noted by my colleagues, the call of your question raises concerns as to whether you are the landlord or merely another tenant. If the later you likely do not have the authority to evict. Plus the basis of eviction needs to be predicated on the agreement. You may want to visit with the LL (assuming you are not the LL) and speak to an attorney for further direction on your options.
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