Thermal Conductivity in the Frustrated Two-Leg Spin- Ladder System BiCu2PO6

27th International Conference on Low Temperature Physics

Nagasawa, H.^1 ; Kawamata, T.^1 ; Naruse, K.^1 ; Ohno, M.^1 ; Matsuoka, Y.^1 ; Sudo, H.^1 ; Hagiya, Y.^1 ; Fujita, M.^2 ; Sasaki, T.^2 ; Koike, Y.^1

Department of Applied Physics, Tohoku University, Sendai, Japan^1

Institute for Materials Research, Tohoku University, Sendai, Japan^2

关键词: Crystallographic axis;    High temperature;    Magnetic field dependences;    Measured temperatures;    Spin ladders;    Temperature dependence;    Two-leg spin ladders;    Zero fields;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/568/4/042012/pdf
DOI  :  10.1088/1742-6596/568/4/042012

来源: IOP

【 摘 要 】

We have measured temperature and magnetic-field dependences of the thermal conductivity of single crystals of the frustrated two-leg spin-ladder system BiCu2PO6in magnetic fields up to 14 T. It has been found that the temperature dependence of the thermal conductivity along every principal crystallographic axis shows two peaks in zero field but that the magnitude of the thermal conductivity along the b-axis parallel to spin ladders, κb, is significantly larger than those of the thermal conductivity along the a-axis, κa, and along the c- axis, κc, at high temperatures above 7 K. These results suggest that the thermal conductivity due to spins probably exists only in κb. Furthermore, it has been found that both magnetic-field dependences of κaand κbat 3 K show kinks at ∼ 7 T and ∼ 10 T, where the spin state may change.