title: Giant barocaloric effect in hexagonal Ni2In-type Mn-Co-Ge-In compounds around room temperature.
abstract: The most widespread cooling techniques based on gas compression/expansion encounter environmental problems. Thus, tremendous effort has been dedicated to develop alternative cooling technique and search for solid state materials that show large caloric effects. An application of pressure to a material can cause a change in temperature, which is called the barocaloric effect. Here we report the giant barocaloric effect in a hexagonal Ni2In-type MnCoGe0.99In0.01 compound involving magnetostructural transformation, Tmstr, which is accompanied with a big difference in the internal energy due to a great negative lattice expansion(ΔV/V ~ 3.9%). High resolution neutron diffraction experiments reveal that the hydrostatic pressure can push the Tmstr to a lower temperature at a rate of 7.7 K/kbar, resulting in a giant barocaloric effect. The entropy change under a moderate pressure of 3 kbar reaches 52 J kg(-1) K(-1), which exceeds that of most materials, including the reported giant magnetocaloric effect driven by 5 T magnetic field that is available only by superconducting magnets.
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics &State Key Laboratory of Magnetism, Institute of Physics Chinese Academy of Sciences, Beijing 100190, P. R. China.|NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.
authors.forename: Rong-Rong
authors.initials: RR
authors.lastname: Wu
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics &State Key Laboratory of Magnetism, Institute of Physics Chinese Academy of Sciences, Beijing 100190, P. R. China.
authors.forename: Li-Fu
authors.initials: LF
authors.lastname: Bao
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics &State Key Laboratory of Magnetism, Institute of Physics Chinese Academy of Sciences, Beijing 100190, P. R. China.
authors.forename: Feng-Xia
authors.initials: FX
authors.lastname: Hu
authors.affiliation: NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.|Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742-2115, USA.
authors.forename: Hui
authors.initials: H
authors.lastname: Wu
authors.affiliation: NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.
authors.forename: Qing-Zhen
authors.initials: QZ
authors.lastname: Huang
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics &State Key Laboratory of Magnetism, Institute of Physics Chinese Academy of Sciences, Beijing 100190, P. R. China.
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics &State Key Laboratory of Magnetism, Institute of Physics Chinese Academy of Sciences, Beijing 100190, P. R. China.
authors.forename: Xiao-Li
authors.initials: XL
authors.lastname: Dong
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics &State Key Laboratory of Magnetism, Institute of Physics Chinese Academy of Sciences, Beijing 100190, P. R. China.
authors.forename: Guan-Nan
authors.initials: GN
authors.lastname: Li
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics &State Key Laboratory of Magnetism, Institute of Physics Chinese Academy of Sciences, Beijing 100190, P. R. China.
authors.forename: Ji-Rong
authors.initials: JR
authors.lastname: Sun
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics &State Key Laboratory of Magnetism, Institute of Physics Chinese Academy of Sciences, Beijing 100190, P. R. China.
authors.forename: Fei-Ran
authors.initials: FR
authors.lastname: Shen
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics &State Key Laboratory of Magnetism, Institute of Physics Chinese Academy of Sciences, Beijing 100190, P. R. China.
authors.forename: Tong-Yun
authors.initials: TY
authors.lastname: Zhao
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics &State Key Laboratory of Magnetism, Institute of Physics Chinese Academy of Sciences, Beijing 100190, P. R. China.
authors.forename: Xin-Qi
authors.initials: XQ
authors.lastname: Zheng
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics &State Key Laboratory of Magnetism, Institute of Physics Chinese Academy of Sciences, Beijing 100190, P. R. China.
authors.forename: Li-Chen
authors.initials: LC
authors.lastname: Wang
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics &State Key Laboratory of Magnetism, Institute of Physics Chinese Academy of Sciences, Beijing 100190, P. R. China.
authors.forename: Yao
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics &State Key Laboratory of Magnetism, Institute of Physics Chinese Academy of Sciences, Beijing 100190, P. R. China.
authors.forename: Wen-Liang
authors.initials: WL
authors.lastname: Zuo
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics &State Key Laboratory of Magnetism, Institute of Physics Chinese Academy of Sciences, Beijing 100190, P. R. China.
authors.forename: Ying-Ying
authors.initials: YY
authors.lastname: Zhao
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics &State Key Laboratory of Magnetism, Institute of Physics Chinese Academy of Sciences, Beijing 100190, P. R. China.
authors.forename: Ming
authors.initials: M
authors.lastname: Zhang
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics &State Key Laboratory of Magnetism, Institute of Physics Chinese Academy of Sciences, Beijing 100190, P. R. China.
authors.forename: Xian-Cheng
authors.initials: XC
authors.lastname: Wang
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics &State Key Laboratory of Magnetism, Institute of Physics Chinese Academy of Sciences, Beijing 100190, P. R. China.
authors.forename: Chang-Qing
authors.initials: CQ
authors.lastname: Jin
authors.affiliation: Department of Information Materials Science and Engineering, Guilin University of Electronic Technology, Guilin, Guangxi 541004, P. R. China.
authors.forename: Guang-Hui
authors.initials: GH
authors.lastname: Rao
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics &State Key Laboratory of Magnetism, Institute of Physics Chinese Academy of Sciences, Beijing 100190, P. R. China.
authors.forename: Xiu-Feng
authors.initials: XF
authors.lastname: Han
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics &State Key Laboratory of Magnetism, Institute of Physics Chinese Academy of Sciences, Beijing 100190, P. R. China.
authors.forename: Bao-Gen
authors.initials: BG
authors.lastname: Shen