Negative Thermal Expansion of Ni-Doped MnCoGe at Room-Temperature Magnetic Tuning
Source abstract
Abstract
Compounds that exhibit the unique behavior of negative thermal expansion (NTE)—the physical property of contraction of the lattice parameters on warming—can be applied widely in modern technologies. Consequently, the search for and design of an NTE material with operational and controllable qualities at room temperature are important topics in both physics and materials science. In this work, we demonstrate a new route to achieve magnetic manipulation of a giant NTE in (Mn0.95Ni0.05)CoGe via strong magnetostructural (MS) coupling around room temperature (∼275 to ∼345 K). The MS coupling is realized through the weak bonding between the nonmagnetic CoGe-network and the magnetic Mn-sublattice. Application of a magnetic field changes the NTE in (Mn0.95Ni0.05)CoGe significantly: in particular, a change of ΔL/L along the a axis of absolute value 15290(60) × 10–6—equivalent to a −31% reduction in NTE—is obtained at 295 K in response to a magnetic field of 8 T.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Thermal Expansion and Ionic Conductivity · Magnetic and transport properties of perovskites and related materials · Shape Memory Alloy Transformations
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Physics and Astronomy and Key Laboratory of Artificial Structures and Quantum Control, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
School of Science, The University of New South Wales at the Australian Defence Force Academy, Canberra, Australian Capital Territory 2600, Australia
College of Physics, Jilin University, Changchun 130012, China
Institute for Superconductivity and Electronic Materials, University of Wollongong, Wollongong, New South Wales 2500, Australia
Australian Centre for Neutron Scattering, Locked Bag 2001, Kirrawee DC, New South Wales 2232, Australia
Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, United States
Funding
Australian Research Council · National Natural Science Foundation of China
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