title: Giant barocaloric effects at low pressure in ferrielectric ammonium sulphate.
abstract: Caloric effects are currently under intense study due to the prospect of environment-friendly cooling applications. Most of the research is centred on large magnetocaloric effects and large electrocaloric effects, but the former require large magnetic fields that are challenging to generate economically and the latter require large electric fields that can only be applied without breakdown in thin samples. Here we use small changes in hydrostatic pressure to drive giant inverse barocaloric effects near the ferrielectric phase transition in ammonium sulphate. We find barocaloric effects and strengths that exceed those previously observed near magnetostructural phase transitions in magnetic materials. Our findings should therefore inspire the discovery of giant barocaloric effects in a wide range of unexplored ferroelectric materials, ultimately leading to barocaloric cooling devices.
authors.affiliation: Departament de Física i Enginyeria Nuclear, ETSEIB, Universitat Politècnica de Catalunya, Diagonal 647, Barcelona, 08028 Catalonia, Spain.
authors.forename: P
authors.initials: P
authors.lastname: Lloveras
authors.affiliation: Facultat de Física, Departament d'Estructura i Constituents de la Matèria, Universitat de Barcelona, Martí i Franquès 1, Barcelona, 08028 Catalonia, Spain.
authors.forename: E
authors.initials: E
authors.lastname: Stern-Taulats
authors.affiliation: Departament de Física i Enginyeria Nuclear, ETSEIB, Universitat Politècnica de Catalunya, Diagonal 647, Barcelona, 08028 Catalonia, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Barrio
authors.affiliation: Departament de Física i Enginyeria Nuclear, ETSEIB, Universitat Politècnica de Catalunya, Diagonal 647, Barcelona, 08028 Catalonia, Spain.
authors.forename: J-Ll
authors.initials: JL
authors.lastname: Tamarit
authors.affiliation: Department of Materials Science, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK.
authors.forename: S
authors.initials: S
authors.lastname: Crossley
authors.affiliation: Department of Materials Science, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK.|School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: W
authors.initials: W
authors.lastname: Li
authors.affiliation: Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut (PSI), CH-5232 Villigen PSI, Switzerland.
authors.forename: V
authors.initials: V
authors.lastname: Pomjakushin
authors.affiliation: Facultat de Física, Departament d'Estructura i Constituents de la Matèria, Universitat de Barcelona, Martí i Franquès 1, Barcelona, 08028 Catalonia, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Planes
authors.affiliation: Facultat de Física, Departament d'Estructura i Constituents de la Matèria, Universitat de Barcelona, Martí i Franquès 1, Barcelona, 08028 Catalonia, Spain.
authors.forename: Ll
authors.initials: L
authors.lastname: Mañosa
authors.affiliation: Department of Materials Science, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK.
authors.forename: N D
authors.initials: ND
authors.lastname: Mathur
authors.affiliation: Facultat de Física, Departament d'Estructura i Constituents de la Matèria, Universitat de Barcelona, Martí i Franquès 1, Barcelona, 08028 Catalonia, Spain.|Department of Materials Science, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK.
authors.forename: X
authors.initials: X
authors.lastname: Moya