Synthesis, structural and magnetic properties of spin ladder compound Ca1−xCoxCu2O3 |
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Authors: | C Sekar S PaulrajG Krabbes M KanagarajS Arumugam Ravhi S Kumar |
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Institution: | a Department of Bioelectronics & Biosensors, Alagappa University, Karaikudi 630003, India b Department of Physics, Periyar University, Salem 636011, India c Leibniz-Institute for Solid State & Materials Research, IFW-Dresden, 01171 Dresden, Germany d Centre for High Pressure Research, Bharathidasan University, Trichy 620024, India e High Pressure Science and Engineering Centre & Department of Physics, University of Nevada Las Vegas, Las Vegas, NV 89154, USA |
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Abstract: | MCu2O3 (M=Ca and Co) system has two-leg spin ladder structure similar to that of the prototype SrCu2O3 system except that the rungs are buckled with an angle of 123° and 105° for CaCu2O3 and CoCu2O3 compounds, respectively. We have synthesized powder samples of (Ca1−xCox)Cu2O3 (x=0.00-1.00) by the solid state reaction method and their structural and magnetic properties have been investigated. All the synthesized compounds crystallize in orthorhombic structure with space group Pmmn. Lattice parameters of (Ca1−xCox)Cu2O3 decrease with the increase in Co content. DC magnetic susceptibility χ(T) results of the end products CaCu2O3 and CoCu2O3 show antiferromagnetic transition (TN) at 27 and 215 K, respectively. Co doping into (Ca1−xCox)Cu2O3 enhances its TN systematically with increasing Co concentration. The χ(T) of CoCu2O3 shows a broad transition with the peak temperature around 215 K and it was found to be field independent up to 90 kOe. The ambiguity concerning the transition was ruled out by recording the temperature dependent X-ray diffraction pattern on CoCu2O3 system, which indicated that there is no structural transition in the investigated temperature range of 115-300 K. Further, specific heat measurement on CoCu2O3 confirms the magnetic phase transition by the appearance of a sharp peak at 215 K. |
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Keywords: | Superconductor Spin ladder Magnetic susceptibility X-ray diffraction |
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