Effect of field-induced magnetic ordering on the electrical resistance of the frustrated magnet Au80Co20 |
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| Institution: | 1. IEN Galileo Ferraris and INFM, UdR TO-Poli, Strada delle Cacce 91, I-10135 Torino, Italy;2. Dipartimento di Fisica, Politecnico di Torino, and INFM, UdR TO-Poli, Corso Duca degli Abruzzi 24, I-10129 Torino, Italy;3. Università di Torino, Dipartimento di Chimica IFM and INFM, UdR Torino Università, Via Giuria 9, I-10125 Torino, Italy;1. Univ Rennes, CNRS, ISCR-UMR6226, ScanMAT-UMS2001, F-35000, Rennes, France;2. CNRS, Saint-Gobain, NIMS, UMI3629, Laboratory for Innovative Key Materials and Structures (LINK), National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan;3. National Institute for Materials Science (NIMS), WPI-MANA and CFSN, Tsukuba, Japan;1. Fert Beijing Institute, School of Electronic and Information Engineering, BDBC, Beihang University, Xueyuan Road 37, Beijing 100191, China;2. Robinson Research Institute, Victoria University of Wellington, P.O. Box 600, Wellington, 6140, New Zealand;3. The MacDiarmid Institute for Advanced Materials and Nanotechnology, New Zealand;1. Department of Physics, Indian Institute of Technology Guwahati, Guwahati 781039, India;2. Department of Physics, University of South Africa, Johannesburg 1710, South Africa;1. Department of Applied Mechanics, Indian Institute of Technology Delhi, New Delhi, 110016, India;2. Department of Mechanical Engineering, Polytechnic University of Puerto Rico, San Juan, 00918, Puerto Rico;1. College of Physics and Information Technology, Shaanxi Normal University, Xian 710119, Shaanxi, PR China;2. College of Physics and Mechanical and Electronic Engineering, Xian University of Arts and Science, Xian 710065, Shaanxi, PR China |
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| Abstract: | Au80Co20 platelets were produced by solid-state quenching followed by furnace annealing and characterized by X-ray diffraction. Magnetization and magnetoresistance (MR) were measured from 2 to 265 K. Minima of the zero-field electrical resistance R0(T) were observed at low temperatures (Tm≈20 K) in both as-quenched and annealed samples. These minima disappear upon applying a magnetic field. At low T, a negative MR is associated to strong frustration and a very short magnetic coherence length; at higher temperatures, a positive MR is also observed. |
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