Pressure-induced colossal magnetocaloric effect in MnAs.
To present day, the maximum magnetocaloric effect (MCE) at room temperature for a magnetic field change of 5 T is 40 J/(kg K) for MnAs. In this Letter we present colossal MCE measurements on MnAs under pressure, reaching values up to 267 J/(kg K), far greater than the magnetic limit arising from the assumption of magnetic field independence of the lattice and electronic entropy contributions. The origin of the effect is the contribution to the entropy variation coming from the lattice through the magnetoelastic coupling.
Gama
Sergio
S
Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas-UNICAMP, Caixa Postal 6165, 13083-970 Campinas, São Paulo, Brazil.
Coelho
Adelino A
AA
de Campos
Ariana
A
Carvalho
A Magnus G
AM
Gandra
Flávio C G
FC
von Ranke
Pedro J
PJ
de Oliveira
Nilson A
NA