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arXiv · 1510.08623

Magnetic State of the Geometrically Frustrated Quasi-One-Dimensional Spin System Cu$_3$Mo$_2$O$_9$ Studied by Thermal Conductivity

Koki Naruse·Takayuki Kawamata·Masumi Ohno·Yoshiharu Matsuoka·Masashi Hase·Haruhiko Kuroe·Tomoyuki Sekine·Kunihiko Oka·Toshimitsu Ito·Hiroshi Eisaki·Takahiko Sasaki·Yoji Koike
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Abstract

We have measured the thermal conductivity of the geometrically frustrated quasi-onedimensional spin system Cu$_3$Mo$_2$O$_9$ in magnetic fields. A contribution of the thermal conductivity due to spins has been observed in the thermal conductivity along the spin chains. The thermal conductivity due to phonons, $\kappa_{\rm phonon}$, has been found to decrease by the application of a magnetic field, which has been explained as being due to the reduction in the spin gap originating from the spin-singlet dimers. Moreover, it has been found that $\kappa_{\rm phonon}$ increases with increasing field in high fields above ~7 T at low temperatures. This suggests the existence of a novel field-induced spin state and is discussed in terms of the possible spin-chirality ordering in a frustrated Mott insulator.

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Koki Naruse, Takayuki Kawamata, Masumi Ohno, Yoshiharu Matsuoka, Masashi Hase, Haruhiko Kuroe, Tomoyuki Sekine, Kunihiko Oka, Toshimitsu Ito, Hiroshi Eisaki, Takahiko Sasaki, Yoji Koike. 2015-10-29. Magnetic State of the Geometrically Frustrated Quasi-One-Dimensional Spin System Cu$_3$Mo$_2$O$_9$ Studied by Thermal Conductivity. https://arxiv.org/abs/1510.08623

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