Stock markets were mixed Thursday as a rally lost momentum after US jobs data

Europe's main equity indices

Investors cheered an earnings report released late Wednesday by AI bellwether Nvidia, which topped expectations on fierce demand for its advanced chips.

Chief executive Jensen Huang brushed off fears of an artificial intelligence bubble that has caused global equities to wobble.

Jim Reid, managing director at Deutsche Bank, said Nvidia's results had temporarily stalled some fears.

But Adam Sarhan of 50 Park Investments warned: "When you have valuations that are this high, they're not sustainable."

Shares in the chip giant -- which last month hit a $5 trillion valuation -- slipped after rallying at the start of Wall Street trading Thursday. They

The upbeat earnings were offse

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