title: Field- and temperature-induced evolution of the magnetocaloric effect in Ba0.3Sr1.7Co2Fe12O22 single crystals with heliconical magnetism.
abstract: The magnetocaloric effect (MCE) associated with the spin transitions of alternating longitudinal conical (ALC)-mixed conical (MC) and MC-ferrimagnetic (FIM) states in a Ba0.3Sr1.7Co2Fe12O22 single crystal has been investigated. For magnetic field directions applied along either the [120] or [001] directions, the crystal is found to exhibit the conventional and inverse MCE near the ALC-MC (T(N1) = 235 K) and MC-FIM (T(N2) = 348 K) states, respectively. The dependence of the magnetic entropy on the magnetic field also exhibits such sign change behaviors in the MCE, which is attributed to the magnetic field induced gradual collapse of heliconical magnetic order.
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China. lqyan@iphy.ac.cn
authors.forename: Li-Qin
authors.initials: LQ
authors.lastname: Yan
authors.forename: Sae Hwan
authors.initials: SH
authors.lastname: Chun
authors.forename: Young
authors.initials: Y
authors.lastname: Sun
authors.forename: Kwang Woo
authors.initials: KW
authors.lastname: Shin
authors.forename: Byung-Gu
authors.initials: BG
authors.lastname: Jeon
authors.forename: Shi Peng
authors.initials: SP
authors.lastname: Shen
authors.forename: Kee Hoon
authors.initials: KH
authors.lastname: Kim