Magnetic phase diagrams of CuGe1-xSixO3 studied by specific heat measurements

M. Hiroi; T. Hamamoto; M. Sera; H. Nojiri; N. Kobayashi; M. Motokawa; O. Fujita; A. Ogiwara; J. Akimitsu

doi:10.1016/S0921-4526(97)00906-X

Magnetic phase diagrams of CuGe_1-xSi_xO₃ studied by specific heat measurements

M. Hiroi, T. Hamamoto, M. Sera, H. Nojiri, N. Kobayashi, M. Motokawa, O. Fujita, A. Ogiwara, J. Akimitsu

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

The specific heat, C, of single crystals of CuGe_1-xSi_xO₃ (x = 0, 0.005, 0.008, 0.01, 0.015, 0.02, 0.027, 0.05) under magnetic field up to 15 T were measured and their magnetic phase diagrams were determined. The compounds with x ≤ 0.015 exhibit two transitions at T_SP and T_N in low magnetic field. An upturn of C/T for x = 0.005 and 0.008 below ∼ 3 K originating from the AF ordering at lower temperatures is suppressed by magnetic field as in the case for x = 0.01. However, the existence of M′ phase above ∼ 10 T which was observed for x = 0.01 was not recognized for x = 0.005 and 0.008, which suggests the existence of a critical x value for the appearance of M′ phase.

Original language	English
Pages (from-to)	242-245
Number of pages	4
Journal	Physica B: Condensed Matter
Volume	246-247
DOIs	https://doi.org/10.1016/S0921-4526(97)00906-X
Publication status	Published - May 29 1998
Externally published	Yes

Keywords

CuGeO
Impurity effect
Magnetic phase diagram
Spin-Peierls state

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

Access to Document

10.1016/S0921-4526(97)00906-X

Cite this

@article{450704fa675d4aabba72ec688557039a,

title = "Magnetic phase diagrams of CuGe1-xSixO3 studied by specific heat measurements",

abstract = "The specific heat, C, of single crystals of CuGe1-xSixO3 (x = 0, 0.005, 0.008, 0.01, 0.015, 0.02, 0.027, 0.05) under magnetic field up to 15 T were measured and their magnetic phase diagrams were determined. The compounds with x ≤ 0.015 exhibit two transitions at TSP and TN in low magnetic field. An upturn of C/T for x = 0.005 and 0.008 below ∼ 3 K originating from the AF ordering at lower temperatures is suppressed by magnetic field as in the case for x = 0.01. However, the existence of M′ phase above ∼ 10 T which was observed for x = 0.01 was not recognized for x = 0.005 and 0.008, which suggests the existence of a critical x value for the appearance of M′ phase.",

keywords = "CuGeO, Impurity effect, Magnetic phase diagram, Spin-Peierls state",

author = "M. Hiroi and T. Hamamoto and M. Sera and H. Nojiri and N. Kobayashi and M. Motokawa and O. Fujita and A. Ogiwara and J. Akimitsu",

note = "Funding Information: This work was carried out in HFLSM, IMR, Tohoku University. This work was partly supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science, and Culture of Japan, CREST of Japan Science and Technology Corporation, and the New Energy and Industrial Technology Development Organization (NEDO).",

year = "1998",

month = may,

day = "29",

doi = "10.1016/S0921-4526(97)00906-X",

language = "English",

volume = "246-247",

pages = "242--245",

journal = "Physica B: Condensed Matter",

issn = "0921-4526",

publisher = "Elsevier",

}

TY - JOUR

T1 - Magnetic phase diagrams of CuGe1-xSixO3 studied by specific heat measurements

AU - Hiroi, M.

AU - Hamamoto, T.

AU - Sera, M.

AU - Nojiri, H.

AU - Kobayashi, N.

AU - Motokawa, M.

AU - Fujita, O.

AU - Ogiwara, A.

AU - Akimitsu, J.

N1 - Funding Information: This work was carried out in HFLSM, IMR, Tohoku University. This work was partly supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science, and Culture of Japan, CREST of Japan Science and Technology Corporation, and the New Energy and Industrial Technology Development Organization (NEDO).

PY - 1998/5/29

Y1 - 1998/5/29

N2 - The specific heat, C, of single crystals of CuGe1-xSixO3 (x = 0, 0.005, 0.008, 0.01, 0.015, 0.02, 0.027, 0.05) under magnetic field up to 15 T were measured and their magnetic phase diagrams were determined. The compounds with x ≤ 0.015 exhibit two transitions at TSP and TN in low magnetic field. An upturn of C/T for x = 0.005 and 0.008 below ∼ 3 K originating from the AF ordering at lower temperatures is suppressed by magnetic field as in the case for x = 0.01. However, the existence of M′ phase above ∼ 10 T which was observed for x = 0.01 was not recognized for x = 0.005 and 0.008, which suggests the existence of a critical x value for the appearance of M′ phase.

AB - The specific heat, C, of single crystals of CuGe1-xSixO3 (x = 0, 0.005, 0.008, 0.01, 0.015, 0.02, 0.027, 0.05) under magnetic field up to 15 T were measured and their magnetic phase diagrams were determined. The compounds with x ≤ 0.015 exhibit two transitions at TSP and TN in low magnetic field. An upturn of C/T for x = 0.005 and 0.008 below ∼ 3 K originating from the AF ordering at lower temperatures is suppressed by magnetic field as in the case for x = 0.01. However, the existence of M′ phase above ∼ 10 T which was observed for x = 0.01 was not recognized for x = 0.005 and 0.008, which suggests the existence of a critical x value for the appearance of M′ phase.

KW - CuGeO

KW - Impurity effect

KW - Magnetic phase diagram

KW - Spin-Peierls state

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U2 - 10.1016/S0921-4526(97)00906-X

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