The country officially went into default yesterday after the failure of 11th-hour talks with two US hedge funds that refused to accept a write-down on their Argentine bonds.
Argentine stocks plummeted today as the repercussions of the default began to set in, and were down 6.45 per cent in afternoon trade.
Argentine President Cristina Kirchner's cabinet chief, Jorge Capitanich, blamed the American government for the default, brought on by a US court ruling that blocked Buenos Aires from servicing its restructured debt without also paying the hedge funds in full.
He accused US District Judge Thomas Griesa and court-appointed mediator Dan Pollack of "incompetence" and said Argentina would take the matter to international courts.
Kirchner was due to give a nationally televised address today evening.
Griesa, meanwhile, set a hearing on the case for tomorrow at 11 am (1500 GMT), a court spokeswoman told AFP.
Ratings agency Standard & Poor's placed Argentina in "selective default" for missing the USD 539-million payment.
Griesa has barred the country from paying "exchange creditors" who accepted a 70-percent write-down on their bonds without also paying the so-called "holdouts" the full USD 1.3 billion it owes them.
Argentina says paying the holdouts could expose it to claims for up to USD 100 billion from exchange creditors, who are entitled to equal treatment under what is called a Rights Upon Future Offers, or RUFO, clause.
