PARIS — Global stock markets stabilized on Tuesday as hope arose that Prime Minister Alexis Tsipras of Greece might still reach a last-minute deal with his country’s international creditors, but Athens missed a deadline for a critical loan repayment to the International Monetary Fund.

Markets fell across the world on Monday, after the Greece government said that a referendum would be held Sunday on whether to accept the bailout terms offered by the so-called troika of international lenders: the I.M.F., the European Central Bank and a group representing European Union member states. On Tuesday, Greece was supposed to have repaid roughly 1.6 billion euros, or $1.8 billion, to the I.M.F.

In Athens, the Greek finance minister, Yanis Varoufakis, told reporters that Greece would not make the I.M.F. payment. But when asked whether there was still a chance that Athens would reach an aid deal with its creditors before Tuesday’s other key deadline — the midnight expiration of the country’s bailout program — Mr. Varoufakis replied, “We hope so.” No deal materialized, however.