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This study demonstrates that ultrafast laser pulses can induce a transient, superconductor-like magnetic state in YBCO up to 400 Kelvin, challenging previous thermal limits for such phenomena. The findings suggest that short-range superconducting correlations can be manipulated via light to generate Meissner-like effects without requiring long-range coherence or cryogenic cooling. This represents a significant step toward controlling quantum material states on picosecond timescales using mid-infrared frequencies.

Source coveringQuantum Zeitgeist

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Quantum transient magnetism in YBCO seen up to 400 Kelvin

Quantum ZeitgeistSeptember 1, 20266 min read

Pumping YBCO with 20 THz pulses above its critical temperature induces a transient, superconductor-like state—and a measurable magnetic field—up to 400 Kelvin.

A 20 terahertz laser pulse applied to YBCO above its superconducting temperature triggers a surprising effect: the emergence of magnetism resembling superconductivity lasting just picoseconds. Researchers detected a transient magnetic field of approximately 10 microtesla for an applied field of 10 millitesla at 100 Kelvin, indicating a temporary Meissner-like effect, a hallmark of superconductivity, induced by the light. This behavior extends beyond room temperature, observed up to 300-400 Kelvin, a temperature range previously thought to preclude such magnetic responses, and suggests a pathway to controlling material states with light even where they wouldn't normally exist. The ability to induce magnetism in yttrium barium copper oxide, or YBCO, at…

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