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Urusova, N.,Semkin, M.,Kratochvilova, M.,Barykina, J.,Volegov, A.,Park, J.-G.,Lee, S.,Pirogov, A. Elsevier 2019 JOURNAL OF ALLOYS AND COMPOUNDS Vol.781 No.-
<P><B>Abstract</B></P> <P>Lithium orthophosphates of the Li<I>M</I>PO<SUB>4</SUB> type (<I>M</I> = Ni, Co, Fe, and Mn) gain intensive development due to the potential applications as electrodes for lithium-ion batteries. The other remarkable property of Li<I>M</I>PO<SUB>4</SUB> is the multiferroicity. We present a study of the crystal structure and magnetic properties, refined anisotropic thermal coefficients and Li-ion migration maps of the LiNi<SUB>0.9</SUB> <I>M</I> <SUB>0.1</SUB>PO<SUB>4</SUB> (<I>M</I> = Co, Mn) single crystals and compared results for the undoped LiNiPO<SUB>4</SUB> and LiMnPO<SUB>4</SUB> ones. All samples have been synthesized by the flux method. In LiNi<SUB>0.9</SUB> <I>M</I> <SUB>0.1</SUB>PO<SUB>4</SUB> (<I>M</I> = Co, Mn), doping increases the lattice constants, unit cell volume, valence bonds, and the anisotropic thermal coefficients. By means of X-ray diffraction and the program package TOPOS, the Li-cation migration maps were obtained. The Li-ions move along the [010] direction which can be clearly visualized in the mixed-metal LiNi<SUB>0.9</SUB> <I>M</I> <SUB>0.1</SUB>PO<SUB>4</SUB> (<I>M</I> = Co, Mn) single crystals. It was found that the 10% doping of LiNiPO<SUB>4</SUB> by cobalt ions leads to a decrease in the formation temperature and to the suppression of the incommensurate phase. The 10% doping of manganese ions increases the transition temperature, while the temperature range of the incommensurate phase narrows.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Structure of Li<I>M</I>PO<SUB>4</SUB> has been refined using single crystal X-ray diffractometer. </LI> <LI> Using Voronoi–Dirichlet approach, the Li-ion migration map was obtained. </LI> <LI> The magnetic phase transition temperatures of Li<I>M</I>PO<SUB>4</SUB> single crystals were determined. </LI> <LI> Co- and Mn-doped LiNiPO<SUB>4</SUB> leads to suppression of the incommensurate phase. </LI> </UL> </P>
Heat transport study of the spin liquid candidate 1T−TaS2
Yu, Y. J.,Xu, Y.,He, L. P.,Kratochvilova, M.,Huang, Y. Y.,Ni, J. M.,Wang, Lihai,Cheong, Sang-Wook,Park, Je-Geun,Li, S. Y. American Physical Society 2017 Physical Review B Vol.96 No.8
<P>We present ultralow-temperature thermal conductivity measurements on single crystals of the prototypical charge-density-wave material 1T-TaS2, which was recently argued to be a candidate for a quantum spin liquid. Our experiments show that the residual linear term of thermal conductivity at zero field is essentially zero, within experimental accuracy. Furthermore, the thermal conductivity is found to be insensitive to the magnetic field up to 9 T. These results clearly demonstrate the absence of itinerant magnetic excitations with fermionic statistics in bulk 1T-TaS2, and thus put a strong constraint on the theories of the ground state of this material.</P>