hi,

It would be quite difficult to take a leave of absence cause you have recently join a new company and not even a one month has passed. I suggest you not to mention the recent Interview as a reason to take leave,  it would make you seem irresponsible for the  current job and your manager or head of the department may not approve of it. at the last you may seek leave for medical emergency, also it would be best to limit your day of leave to 2-3 days.