Phase coexistence and magnetocaloric effect in La5/8-yPryCa3/8MnO3 (y=0.275)

被引：100

作者：

Phan, M. H. ^{[1
]}

Morales, M. B. ^{[1
]}

Bingham, N. S. ^{[1
]}

Srikanth, H. ^{[1
]}

Zhang, C. L. ^{[2
,3
]}

Cheong, S. W. ^{[2
,3
]}

机构：

[1] Univ S Florida, Dept Phys, Tampa, FL 33620 USA

[2] Rutgers State Univ, Rutgers Ctr Emergent Mat, Piscataway, NJ 08854 USA

[3] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

来源：

PHYSICAL REVIEW B | 2010年 / 81卷 / 09期

关键词：

MAGNETIC-FIELD; MANGANITES; MAGNETORESISTANCE; TRANSITION;

D O I：

10.1103/PhysRevB.81.094413

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The magnetocaloric effect (MCE) was measured to probe the nature of phase coexistence of structurally different ferromagnetic metallic (FMM) and charge-ordered insulating phases in La5/8-yPryCa3/8MnO3 (y = 0.275) single crystals. The MCE peaks with both positive and negative values are observed in the vicinity of the multiple-phase transitions in the system. Strain associated with the phase coexistence has been known to stabilize a strain-glass state as well as a strain-liquid state. The large MCE is observed in the "dynamic" strain liquid state, while it is relatively small in the "frozen" strain-glass state. The MCE data reveal that the sharp increase in the magnetization below the Curie temperature in the strain-liquid region is attributed to the enhancement of the FM domain regions that are already present in the material. MCE is also shown to be a useful method to probe the subtle balance of coexisting phases in mixed-phase manganites.

引用

页数：6

共 44 条

[1] The effect of magnetic irreversibility on estimating the magnetocaloric effect from magnetization measurements [J].