The nonstoichiometric compound [Ba]x[(Pt,Cu)O3] (x = 1.317) has a composite crystal structure with
RP31 c . DR3mI I~.-is, a=5.817(2), c=4.233(1)A, k=(a*+ b*)/3 + 1.519 (1)c*, V = 124.0 A 3, Z1 = 2, Z2 = 3, Dx =7.46Mgm-3, MoKa, CuKfl, /.t(MoKa)= 42.9 mm-l. The structure was analyzed by a newly developed computer program based on the theory reported in a previous paper [Yamamoto (1992).Acta Cryst. A48, 476--483]. Final R factors: 0.075 (overall), 0.041 (main), 0.108 (first-order satellite), 0.102 (second-order satellite) and 0.224 (third-order satellite). The first subsystem, Ba, is located in the channels of the second columnar subsystem, (Pt,Cu)O3, parallel to the c axis. Atomic position and Pt/Cu-atom occupancies are modulated along the c axis by the interaction between the two subsystems. Ba atoms are displaced helically while Pt/Cu atoms have a displacive modulation only along the c axis with rotational displacement of the coordinated 03 atom clusters around the c axis. The first subsystem has a trigonal structure but with rhombohedral modulation because of the rhombohedral subsystem of (Pt,Cu)O3. The possibility of a phase transition specific to the composite crystals is discussed.
We report the transport properties in the vortex liquid states induced by quantum fluctuations at low temperature in the layered organic superconductor -(BEDT-TTF) 2 Cu(NCS) 2 . A steep drop of the resistivity observed below about 1 K separates the liquid state into two regions. In the low-resistance state at lower temperature, a finite resistivity with weak temperature dependence persists down to 100 mK at least. The finite resistivity in the vortex state at TӍ0 K indicates the realization of quantum vortex liquid assisted by the strong quantum fluctuations instead of the thermal one. A possible origin for separating these liquid states is a remnant vortex melting line at the original position, which is obscured and suppressed by the quantum fluctuations. A nonlinear behavior of the in-plane resistivity appears at large current density in only the low-resistance state, but not in another vortex liquid state at higher temperature, where the thermal fluctuations are dominant. The transport properties in the low-resistance state are well understood in the vortex slush concept with a shortrange order of vortices. Thus the low-resistance state below 1 K is considered to be a novel quantum vortex slush state.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.