Calorimetric and magnetic investigations of the metamagnet Pr0.5Ca0.5Mn0.95Ga0.05O3 -: art. no. 024401

被引：62

作者：

Hardy, V ^{[1
]}

Maignan, A ^{[1
]}

Hébert, S ^{[1
]}

Martin, C ^{[1
]}

机构：

[1] Univ Caen, Inst Sci Mat & Rayonnement, Unite Mixte Rech 6508, Lab CRISMAT, F-14050 Caen, France

来源：

PHYSICAL REVIEW B | 2003年 / 67卷 / 02期

关键词：

D O I：

10.1103/PhysRevB.67.024401

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The antiferromagnetic, charge and orbitally ordered (AFCOO) ground state of some manganites like Pr0.5Ca0.5MnO3 can be efficiently destabilized by slight Mn-site substitutions. Such a weakened AFCOO state and related disorder effects were investigated in Pr0.5Ca0.5Mn0.95Ga0.05O3 by combining specific-heat and magnetization measurements. The study was extended to the ferromagnetic state which can be installed in this compound by field application at low T. Under a large field, the temperature-driven collapse of this ferromagnetic state was found to be consistent with the Clausius-Clapeyron relation typical of first-order transitions. A comparative study of the various magnetoelectronic states encountered in the substituted and unsubstituted compounds was also carried out by investigating the low-temperature dependence of specific heat.

引用

页数：7

共 33 条

[1] CONSIDERATIONS ON DOUBLE EXCHANGE [J].

ANDERSON, PW ;

HASEGAWA, H .

PHYSICAL REVIEW, 1955, 100 (02) :675-681

[2] Neutron diffraction evidence for a new ferromagnetic phase in Cr doped Pr0.5Ca0.5MnO3 [J].

Damay, F ;

Martin, C ;

Maignan, A ;

Hervieu, M ;

Raveau, B ;

Bourée, F ;

André, G .

APPLIED PHYSICS LETTERS, 1998, 73 (25) :3772-3774

[3] Phase separation and low-field bulk magnetic properties of Pr0.7Ca0.3MnO3 -: art. no. 172408 [J].

Deac, IG ;

Mitchell, JF ;

Schiffer, P .

PHYSICAL REVIEW B, 2001, 63 (17) :1724081-1724085

[4] EFFECTS OF DOUBLE EXCHANGE IN MAGNETIC CRYSTALS [J].

DEGENNES, PG .

PHYSICAL REVIEW, 1960, 118 (01) :141-154

[5] Specific heat and magnetic order in LaMnO3+δ [J].

Ghivelder, L ;

Castillo, IA ;

Gusmao, MA ;

Alonso, JA ;

Cohen, LF .

PHYSICAL REVIEW B, 1999, 60 (17) :12184-12190

[6] Specific heat of La1-xCaxMnO3-δ [J].

Ghivelder, L ;

Castillo, IA ;

Alford, NM ;

Tomka, GJ ;

Riedi, PC ;

MacManus-Driscoll, J ;

Hossain, AKMA ;

Cohen, LF .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1998, 189 (03) :274-282

[7] Specific heat and thermal expansion of La0.65Ca0.35MnO3:: Magnetic-field dependence, isotope effect, and evidence for a first-order phase transition -: art. no. 024441 [J].

Gordon, JE ;

Marcenat, C ;

Franck, JP ;

Isaac, I ;

Zhang, GW ;

Lortz, R ;

Meingast, C ;

Bouquet, F ;

Fisher, RA ;

Phillips, NE .

PHYSICAL REVIEW B, 2002, 65 (02) :1-4

[8] Low-temperature specific heat in Pr0.63Ca0.37MnO3:: Phase separation and metamagnetic transition -: art. no. 224403 [J].

Hardy, V ;

Wahl, A ;

Martin, C ;

Simon, C .

PHYSICAL REVIEW B, 2001, 63 (22)

[9] Magnetic-field-induced step-like transitions in Mn-site doped manganites [J].

Hébert, S ;

Hardy, V ;

Maignan, A ;

Mahendiran, R ;

Hervieu, M ;

Martin, C ;

Raveau, B .

JOURNAL OF SOLID STATE CHEMISTRY, 2002, 165 (01) :6-11

[10] Avalanche like field dependent magnetization of Mn-site doped charge-ordered manganites [J].

Hébert, S ;

Maignan, A ;

Hardy, V ;

Martin, C ;

Hervieu, M ;

Raveau, B .

SOLID STATE COMMUNICATIONS, 2002, 122 (06) :335-340

← 1 2 3 4 →