Specific heat of geometrically frustrated and multiferroic R Mn1-x Gax O3 (R=Ho,Y)

H. D. Zhou; J. A. Janik; B. W. Vogt; Y. J. Jo; L. Balicas; M. J. Case; C. R. Wiebe; J. C. Denyszyn; J. B. Goodenough; J. G. Cheng

doi:10.1103/PhysRevB.74.094426

Specific heat of geometrically frustrated and multiferroic R Mn1-x Gax O3 (R=Ho,Y)

H. D. Zhou, J. A. Janik, B. W. Vogt, Y. J. Jo, L. Balicas, M. J. Case, C. R. Wiebe, J. C. Denyszyn, J. B. Goodenough, J. G. Cheng

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Abstract

Specific heat measurements on single crystals of R Mn1-x Gax O3 (R=Ho,Y) have revealed that Ga doping raises the Mn-spin reorientation temperature TSR while lowering the antiferromagnetic ordering temperature, TN, of the Mn spins and the Ho magnetic ordering temperature T2. The variations of the calculated magnetic entropy with Ga doping show the existence of spin fluctuations above TN in the geometrically frustrated Mn-spin system and a coupling between the Mn3+ -ion and Ho3+ -ion spins both at TSR and T2. The data also support Schottky anomalies in the specific heat of Ho Mn1-x Gax O3, which is dominated by crystalline electric fields but also affected by Mn3+ -ion spin orderings. The large electronic contribution to specific heat of HoMn O3, γ, is suggested to be due to Ho3+ spin disorder.

Original language	English
Article number	094426
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	74
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevB.74.094426
State	Published - 2006

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10.1103/PhysRevB.74.094426

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title = "Specific heat of geometrically frustrated and multiferroic R Mn1-x Gax O3 (R=Ho,Y)",

abstract = "Specific heat measurements on single crystals of R Mn1-x Gax O3 (R=Ho,Y) have revealed that Ga doping raises the Mn-spin reorientation temperature TSR while lowering the antiferromagnetic ordering temperature, TN, of the Mn spins and the Ho magnetic ordering temperature T2. The variations of the calculated magnetic entropy with Ga doping show the existence of spin fluctuations above TN in the geometrically frustrated Mn-spin system and a coupling between the Mn3+ -ion and Ho3+ -ion spins both at TSR and T2. The data also support Schottky anomalies in the specific heat of Ho Mn1-x Gax O3, which is dominated by crystalline electric fields but also affected by Mn3+ -ion spin orderings. The large electronic contribution to specific heat of HoMn O3, γ, is suggested to be due to Ho3+ spin disorder.",

author = "Zhou, {H. D.} and Janik, {J. A.} and Vogt, {B. W.} and Jo, {Y. J.} and L. Balicas and Case, {M. J.} and Wiebe, {C. R.} and Denyszyn, {J. C.} and Goodenough, {J. B.} and Cheng, {J. G.}",

year = "2006",

doi = "10.1103/PhysRevB.74.094426",

language = "English",

volume = "74",

journal = "Physical Review B - Condensed Matter and Materials Physics",

issn = "1098-0121",

publisher = "American Physical Society",

number = "9",

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TY - JOUR

T1 - Specific heat of geometrically frustrated and multiferroic R Mn1-x Gax O3 (R=Ho,Y)

AU - Zhou, H. D.

AU - Janik, J. A.

AU - Vogt, B. W.

AU - Jo, Y. J.

AU - Balicas, L.

AU - Case, M. J.

AU - Wiebe, C. R.

AU - Denyszyn, J. C.

AU - Goodenough, J. B.

AU - Cheng, J. G.

PY - 2006

Y1 - 2006

N2 - Specific heat measurements on single crystals of R Mn1-x Gax O3 (R=Ho,Y) have revealed that Ga doping raises the Mn-spin reorientation temperature TSR while lowering the antiferromagnetic ordering temperature, TN, of the Mn spins and the Ho magnetic ordering temperature T2. The variations of the calculated magnetic entropy with Ga doping show the existence of spin fluctuations above TN in the geometrically frustrated Mn-spin system and a coupling between the Mn3+ -ion and Ho3+ -ion spins both at TSR and T2. The data also support Schottky anomalies in the specific heat of Ho Mn1-x Gax O3, which is dominated by crystalline electric fields but also affected by Mn3+ -ion spin orderings. The large electronic contribution to specific heat of HoMn O3, γ, is suggested to be due to Ho3+ spin disorder.

AB - Specific heat measurements on single crystals of R Mn1-x Gax O3 (R=Ho,Y) have revealed that Ga doping raises the Mn-spin reorientation temperature TSR while lowering the antiferromagnetic ordering temperature, TN, of the Mn spins and the Ho magnetic ordering temperature T2. The variations of the calculated magnetic entropy with Ga doping show the existence of spin fluctuations above TN in the geometrically frustrated Mn-spin system and a coupling between the Mn3+ -ion and Ho3+ -ion spins both at TSR and T2. The data also support Schottky anomalies in the specific heat of Ho Mn1-x Gax O3, which is dominated by crystalline electric fields but also affected by Mn3+ -ion spin orderings. The large electronic contribution to specific heat of HoMn O3, γ, is suggested to be due to Ho3+ spin disorder.

UR - http://www.scopus.com/inward/record.url?scp=33749004302&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.74.094426

DO - 10.1103/PhysRevB.74.094426

M3 - Article

AN - SCOPUS:33749004302

SN - 1098-0121

VL - 74

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 9

M1 - 094426

ER -

Specific heat of geometrically frustrated and multiferroic R Mn1-x Gax O3 (R=Ho,Y)

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