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- W1542096244 abstract "We report muon spin relaxation $(ensuremath{mu}text{SR})$ and magnetic-susceptibility measurements on $text{Cu}(text{Cl},text{Br})text{La}{(text{Nb},text{Ta})}_{2}{text{O}}_{7}$, which demonstrate: (a) the absence of static magnetism in $(text{CuCl}){text{LaNb}}_{2}{text{O}}_{7}$ down to 15 mK confirming a spin-gapped ground state; (b) phase separation between partial volumes with a spin-gap and static magnetism in $(text{CuCl})text{La}{(text{Nb},text{Ta})}_{2}{text{O}}_{7}$; (c) history-dependent magnetization in the (Nb,Ta) and (Cl,Br) substitution systems; (d) a uniform long-range collinear antiferromagnetic state in $(text{CuBr}){text{LaNb}}_{2}{text{O}}_{7}$; and (e) a decrease in N'eel temperature with decreasing Br concentration $x$ in $text{Cu}({text{Cl}}_{1ensuremath{-}x}{text{Br}}_{x}){text{LaNb}}_{2}{text{O}}_{7}$ with no change in the ordered Cu moment size for $0.33ensuremath{le}xensuremath{le}1$. Together with several other $ensuremath{mu}text{SR}$ studies of quantum phase transitions in geometrically frustrated spin systems, the present results reveal that the evolution from a spin-gap to a magnetically ordered state is often associated with phase separation and/or a first-order phase transition." @default.
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- W1542096244 date "2009-11-13" @default.
- W1542096244 modified "2023-09-26" @default.
- W1542096244 title "Muon spin relaxation studies of the frustrated quasi-two-dimensional square-lattice spin system<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mtext>Cu</mml:mtext><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mtext>Cl</mml:mtext><mml:mo>,</mml:mo><mml:mtext>Br</mml:mtext></mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mtext>La</mml:mtext><mml:msub><mml:mrow><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mtext>Nb</mml:mtext><mml:mo>,</mml:mo><mml:mtext>Ta</mml:…" @default.
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- W1542096244 doi "https://doi.org/10.1103/physrevb.80.174408" @default.
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