Highly Mobile Gapless Excitations in a Two-Dimensional Candidate Quantum Spin Liquid
The nature of quantum spin liquids, a novel state of matter where strong quantum fluctuations destroy the long-range magnetic order even at zero temperature, is a long-standing issue in physics. We measured the low-temperature thermal conductivity of the recently discovered quantum spin liquid candi...
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| Veröffentlicht in: | Science (American Association for the Advancement of Science) 2010-06, Vol.328 (5983), p.1246-1248 |
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| creator | Yamashita, Minoru Nakata, Norihito Senshu, Yoshinori Nagata, Masaki Yamamoto, Hiroshi M Kato, Reizo Shibauchi, Takasada Matsuda, Yuji |
| description | The nature of quantum spin liquids, a novel state of matter where strong quantum fluctuations destroy the long-range magnetic order even at zero temperature, is a long-standing issue in physics. We measured the low-temperature thermal conductivity of the recently discovered quantum spin liquid candidate, the organic insulator EtMe₃Sb[Pd(dmit)₂]₂. A sizable linear temperature dependence term is clearly resolved in the zero-temperature limit, indicating the presence of gapless excitations with an extremely long mean free path, analogous to excitations near the Fermi surface in pure metals. Its magnetic field dependence suggests a concomitant appearance of spin-gap-like excitations at low temperatures. These findings expose a highly unusual dichotomy that characterizes the low-energy physics of this quantum system. |
| doi_str_mv | 10.1126/science.1188200 |
| format | Article |
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We measured the low-temperature thermal conductivity of the recently discovered quantum spin liquid candidate, the organic insulator EtMe₃Sb[Pd(dmit)₂]₂. A sizable linear temperature dependence term is clearly resolved in the zero-temperature limit, indicating the presence of gapless excitations with an extremely long mean free path, analogous to excitations near the Fermi surface in pure metals. Its magnetic field dependence suggests a concomitant appearance of spin-gap-like excitations at low temperatures. 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| ispartof | Science (American Association for the Advancement of Science), 2010-06, Vol.328 (5983), p.1246-1248 |
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| subjects | Condensed matter: electronic structure, electrical, magnetic, and optical properties Correlations Dichotomies Exact sciences and technology Excitation Fermi surfaces Fluctuation General theory and models of magnetic ordering Ground state Insulators Liquids Low temperature Low temperature physics Magnetic fields Magnetic properties and materials Magnetism Mean free path Particle spin Physics Quantum physics Spin liquid Spin-glass and other random models Temperature dependence Thermal conductivity |
| title | Highly Mobile Gapless Excitations in a Two-Dimensional Candidate Quantum Spin Liquid |
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