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Researchers discovered a new field-induced phase transition in the kagome superconductor KV_{3}Sb_{5}. This transition reveals an unexpected broken symmetry state coexisting with the charge density wave (CDW), offering insights into complex quantum phenomena in kagome materials.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Kagome lattice materials exhibit unique electronic properties due to band topology, flat bands, and Van Hove singularities.
  • These properties lead to competing or cooperating electronic orders, with their interrelations being a significant challenge in condensed matter physics.

Purpose of the Study:

  • To investigate the electronic behavior of the kagome superconductor KV_{3}Sb_{5} under external magnetic fields.
  • To understand the coexistence and interplay of different electronic orders, specifically the charge density wave (CDW) and potential new phases.

Main Methods:

  • Experimental measurements including resistivity, nonlinear electrical transport, and angular magnetoresistivity.
  • Theoretical modeling using a minimal model for the normal state within the parent CDW phase.

Main Results:

  • An unpredicted field-induced phase transition was observed in KV_{3}Sb_{5} below 6 K.
  • This transition is characterized by resistivity anomalies, nonlinear transport, and a change in electronic symmetry, suggesting a new broken symmetry state coexisting with the CDW.
  • A theoretical model explained the emergence of an incommensurate CDW under suppressed superconducting fluctuations in high magnetic fields.

Conclusions:

  • Quantum states in kagome superconductors can coexist or be nearly degenerate in energy.
  • KV_{3}Sb_{5} presents a rich platform for exploring new correlated phenomena due to the interplay of multiple quantum states.
  • The discovery highlights the complexity of electronic orders in kagome systems and opens avenues for further research into their exotic properties.