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Highly mobile gapless excitations in a two-dimensional candidate quantum spin liquid.

Minoru Yamashita1, Norihito Nakata, Yoshinori Senshu

  • 1Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan. yamashitaminoru@scphys.kyoto-u.ac.jp

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Researchers studied quantum spin liquids, a unique state of matter. Measurements revealed gapless excitations with long mean free paths and spin-gap-like excitations, highlighting unusual low-energy physics in EtMe3Sb[Pd(dmit)2]2.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science

Background:

  • Quantum spin liquids are exotic states of matter characterized by strong quantum fluctuations that prevent long-range magnetic order, even at absolute zero temperature.
  • Understanding the fundamental properties of these novel states is crucial for advancing quantum physics and materials science.

Purpose of the Study:

  • To investigate the low-temperature thermal conductivity of the organic quantum spin liquid candidate, EtMe3Sb[Pd(dmit)2]2.
  • To identify the nature of low-energy excitations and their characteristics in this material.

Main Methods:

  • Low-temperature thermal conductivity measurements were performed on the organic insulator EtMe3Sb[Pd(dmit)2]2.
  • The temperature and magnetic field dependence of thermal conductivity were analyzed to probe the excitations.

Main Results:

  • A significant linear temperature dependence term was observed in the thermal conductivity at the zero-temperature limit.
  • This indicates the presence of gapless excitations possessing an exceptionally long mean free path, similar to those found in metals.
  • Magnetic field dependence revealed the emergence of spin-gap-like excitations at low temperatures.

Conclusions:

  • The study reveals a unique dichotomy in the low-energy physics of the quantum spin liquid candidate EtMe3Sb[Pd(dmit)2]2.
  • The findings suggest the coexistence of metallic-like gapless excitations and spin-gap excitations, offering new insights into quantum spin liquid behavior.