Metallocene compound, catalyst composition comprising the same, and method for preparing olefin polymer using the same

A metallocene compound represented by Chemical Formula 1:

• wherein in Chemical Formula 1,
• M is Group 4 transition metal,
• A is carbon or silicon,
• X1 and X2 are each independently, hydrogen, halogen, or substituted or unsubstituted C1-30 alkyl;
• R1 to R4 are each independently, hydrogen, substituted or unsubstituted C1-30 alkyl, substituted or unsubstituted C2-30 alkenyl, substituted or unsubstituted C1-30 alkoxy, substituted or unsubstituted C2-30 alkoxyalkyl, substituted or unsubstituted C6-30 aryl, or two adjacent R1 to R4 that are bonded to each other to form a substituted or unsubstituted C5-30 fused ring;
• R5 and R6 are each independently, hydrogen, substituted or unsubstituted C1-30 alkyl, substituted or unsubstituted C2-30 alkenyl, substituted or unsubstituted C1-30 alkoxy, substituted or unsubstituted C2-30 alkoxyalkyl, or substituted or unsubstituted C6-30 aryl;
• R7 and R8 are each independently, substituted or unsubstituted C1-30 alkyl, substituted or unsubstituted C2-30 alkenyl, substituted or unsubstituted C1-30 alkoxy, substituted or unsubstituted C2-30 alkoxyalkyl, substituted or unsubstituted C6-30 aryl, or R7 and R8 that are bonded to each other to form a substituted or unsubstituted C5-30 spiro ring;
• R9 is substituted or unsubstituted C1-30 alkyl, substituted or unsubstituted C2-30 alkenyl, C1-30 alkoxy, substituted or unsubstituted C2-30 alkoxyalkyl, or substituted or unsubstituted C6-30 aryl;
• each R10 is independently, hydrogen, substituted or unsubstituted C1-30 alkyl, substituted or unsubstituted C2-30 alkenyl, substituted or unsubstituted C1-30 alkoxy, substituted or unsubstituted C2-30 alkoxyalkyl, substituted or unsubstituted C6-30 aryl, or two adjacent R10 that are bonded to each other to form a substituted or unsubstituted C5-30 fused ring,
• R11 is hydrogen, substituted or unsubstituted C1-30 alkyl, substituted or unsubstituted C2-30 alkenyl, C1-30 alkoxy, substituted or unsubstituted C2-30 alkoxyalkyl, or substituted or unsubstituted C6-30 aryl,
• m is an integer of 1 to 4,
• n is an integer of 1 to 3, and
• k is 0 or 1.