SYDNEY (Reuters) -Australia's fourth largest pension fund suspended new work with PwC Australia on Tuesday, the latest in a string of funds to pause work with the accounting firm over a scandal which first surfaced in January over the misuse of government tax plans. The decision by UniSuper, which manages A$115 billion ($77 billion), means five of Australia's largest pension funds, managing a total of some A$865 billion, have paused work with PwC, which says it is a "leading adviser" to the sector. UniSuper said it was concerned by recent events at PwC and the fund had suspended new contracts for the "immediate future".