Low-temperature heat transport of the zigzag spin-chain compound SrEr2O4 |
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| Affiliation: | 1.Department of Physics, Key Laboratory of Strongly-Coupled Quantum Matter Physics(CAS), University of Science and Technology of China, Hefei 230026, China;2.Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200, USA;3.Institute of Physical Science and Information Technology, Anhui University, Hefei 230601, China |
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| Abstract: | Low-temperature thermal conductivity ($\kappa$), as well as the magnetic properties and specific heat, are studied for the frustrated zigzag spin-chain material SrEr$_{2}$O$_{4}$ by using single-crystal samples. The specific heat data indicate the long-range antiferromagnetic transition at $\sim 0.73 $ K and the existence of strong magnetic fluctuations. The magnetizations at very low temperatures for magnetic field along the $c$ axis (spin chain direction) or the $a$ axis reveal the field-induced magnetic transitions. The $\kappa $ shows a strong dependence on magnetic field, applied along the $c$ axis or the $a$ axis, which is closely related to the magnetic transitions. Furthermore, high magnetic field induces a strong increase of $\kappa $. These results indicate that thermal conductivity along either the $c$ axis or the $a$ axis are mainly contributed by phonons, while magnetic excitations play a role of scattering phonons. |
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| Keywords: | spin chain quantum spin system thermal conductivity |
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