Specific heat of geometrically frustrated and multiferroic RMn1-xGaxO3 (R=Ho,Y)

被引：19

作者：

Zhou, H. D. ^{[1
]}

Janik, J. A.

Vogt, B. W.

Jo, Y. J.

Balicas, L.

Case, M. J.

Wiebe, C. R.

Denyszyn, J. C.

Goodenough, J. B.

Cheng, J. G.

机构：

[1] Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA

[2] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32306 USA

[3] Univ Texas, Texas Mat Inst, Austin, TX 78712 USA

[4] Harbin Inst Technol, Dept Appl Phys, CCMST, Harbin 150001, Peoples R China

来源：

PHYSICAL REVIEW B | 2006年 / 74卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.74.094426

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Specific heat measurements on single crystals of RMn1-xGaxO3 (R=Ho,Y) have revealed that Ga doping raises the Mn-spin reorientation temperature T-SR while lowering the antiferromagnetic ordering temperature, T-N, of the Mn spins and the Ho magnetic ordering temperature T-2. The variations of the calculated magnetic entropy with Ga doping show the existence of spin fluctuations above T-N in the geometrically frustrated Mn-spin system and a coupling between the Mn3+-ion and Ho3+-ion spins both at T-SR and T-2. The data also support Schottky anomalies in the specific heat of HoMn1-xGaxO3, which is dominated by crystalline electric fields but also affected by Mn3+-ion spin orderings. The large electronic contribution to specific heat of HoMnO3, gamma, is suggested to be due to Ho3+ spin disorder.

引用

页数：6

共 22 条

[1] Specific heat of single-crystal PrMnO3 [J].

Cheng, JG ;

Sui, Y ;

Wang, XJ ;

Liu, ZG ;

Miao, JP ;

Huang, XQ ;

Lü, Z ;

Qian, ZN ;

Su, WH .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2005, 17 (37) :5869-5879

[2]

Coeure Philippe., 1966, PROC INT M FERROELEC, P332

[3] Strong spin-lattice coupling in multiferroic HoMnO3:: Thermal expansion anomalies and pressure effect -: art. no. 060407 [J].

dela Cruz, C ;

Yen, F ;

Lorenz, B ;

Wang, YQ ;

Sun, YY ;

Gospodinov, MM ;

Chu, CW .

PHYSICAL REVIEW B, 2005, 71 (06)

[4] Determination of the magnetic symmetry of hexagonal manganites by second harmonic generation [J].

Fiebig, M ;

Fröhlich, D ;

Kohn, K ;

Leute, S ;

Lottermoser, T ;

Pavlov, VV ;

Pisarev, RV .

PHYSICAL REVIEW LETTERS, 2000, 84 (24) :5620-5623

[5] Spin-rotation phenomena and magnetic phase diagrams of hexagonal RMnO3 [J].

Fiebig, M ;

Lottermoser, T ;

Pisarev, RV .

JOURNAL OF APPLIED PHYSICS, 2003, 93 (10) :8194-8196

[6] Magnetic phase diagram of HoMnO3 [J].

Fiebig, M ;

Degenhardt, C ;

Pisarev, RV .

JOURNAL OF APPLIED PHYSICS, 2002, 91 (10) :8867-8869

[7] 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

[8] Geometrically frustrated magnetic materials [J].

Greedan, JE .

JOURNAL OF MATERIALS CHEMISTRY, 2001, 11 (01) :37-53

[9] Spin-glass-like magnetic ground state of the geometrically frustrated pyrochlore niobate Tb2Nb2O7 -: art. no. 174413 [J].

Jana, YM ;

Sakai, O ;

Higashinaka, R ;

Fukazawa, H ;

Maeno, Y ;

Dasgupta, P ;

Ghosh, D .

PHYSICAL REVIEW B, 2003, 68 (17)

[10] Dielectric and magnetic anomalies and spin frustration in hexagonal RMnO3 (R = Y, Yb, and Lu) -: art. no. 104419 [J].

Katsufuji, T ;

Mori, S ;

Masaki, M ;

Moritomo, Y ;

Yamamoto, N ;

Takagi, H .

PHYSICAL REVIEW B, 2001, 64 (10)

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