Negative Thermal Expansion of Ni-Doped MnCoGe at Room-Temperature Magnetic Tuning

Authors

Qingyong Ren, University of New South Wales, Shanghai Jiao Tong University
Wayne D. Hutchison, University of New South Wales
Jian Li Wang, University of Wollongong, Jilin UniversityFollow
Andrew J. Studer, Australian Centre for Neutron Scattering
Guohua Wang, Shanghai Jiao Tong University
Haidong Zhou, Shanghai Jiao Tong University, University of Tennessee
Jie A/Prof Jie Ma, Shanghai Jiao Tong University
Stewart J. Campbell, University of New South WalesFollow

RIS ID

135889

Publication Details

Ren, Q., Hutchison, W., Wang, J., Studer, A., Wang, G., Zhou, H., Ma, J. & Campbell, S. J. (2019). Negative Thermal Expansion of Ni-Doped MnCoGe at Room-Temperature Magnetic Tuning. ACS Applied Materials and Interfaces, 11 (19), 17531-17538.

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 (Mn 0.95 Ni 0.05 )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 (Mn 0.95 Ni 0.05 )CoGe significantly: in particular, a change of ΔL/L along the a axis of absolute value 15290(60) x 10 -6 - equivalent to a -31% reduction in NTE - is obtained at 295 K in response to a magnetic field of 8 T.

Grant Number

ARC/DP110102386, ARC/LE1001000177