Unusual antiferromagnetic state in the dimerized phase in CuGe1-xSixO3 studied by lattice distortion

M. Sera, K. Yamamoto, M. Hiroi, N. Kobayashi, O. Fujita, A. Ogiwara, Jun Akimitsu

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We have studied the thermal expansion and magnetostriction of CuGe1-xSixO3 (x = 0, 0.01, 0.015, and 0.02) single crystals under magnetic fields up to 15 T. The lattice distortion in the antiferromagnetic (AF) state, which is opposite to that in the dimerized (D) phase, exhibits unusual magnetic-field dependence for x = 0.01, where the AF state coexists with the D state. The lattice distortion due to AF ordering is rapidly suppressed and in its place, the lattice distortion due to the dimerization is enhanced by magnetic field up to ∼7 T. Anomalies in the thermal expansion and specific heat at TN are very small at ∼7 T in contrast with their clear anomalies in lower and higher magnetic fields. These indicate that the nature of the AF state is largely changed by the magnetic field and that the electronic state below and above TN is not so different at ∼7 T. Such unusual behavior in a magnetic field is not observed in the AF state for x = 0.02, where there exists only AF ordering.

Original languageEnglish
Pages (from-to)14771-14775
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume56
Issue number22
Publication statusPublished - Dec 1 1997
Externally publishedYes

Fingerprint

Magnetic fields
magnetic fields
Thermal expansion
thermal expansion
anomalies
Magnetostriction
Dimerization
Electronic states
dimerization
magnetostriction
Specific heat
specific heat
Single crystals
heat
single crystals
electronics

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Unusual antiferromagnetic state in the dimerized phase in CuGe1-xSixO3 studied by lattice distortion. / Sera, M.; Yamamoto, K.; Hiroi, M.; Kobayashi, N.; Fujita, O.; Ogiwara, A.; Akimitsu, Jun.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 56, No. 22, 01.12.1997, p. 14771-14775.

Research output: Contribution to journalArticle

Sera, M. ; Yamamoto, K. ; Hiroi, M. ; Kobayashi, N. ; Fujita, O. ; Ogiwara, A. ; Akimitsu, Jun. / Unusual antiferromagnetic state in the dimerized phase in CuGe1-xSixO3 studied by lattice distortion. In: Physical Review B - Condensed Matter and Materials Physics. 1997 ; Vol. 56, No. 22. pp. 14771-14775.
@article{682047a89b084f788c60cbfb9ffe4817,
title = "Unusual antiferromagnetic state in the dimerized phase in CuGe1-xSixO3 studied by lattice distortion",
abstract = "We have studied the thermal expansion and magnetostriction of CuGe1-xSixO3 (x = 0, 0.01, 0.015, and 0.02) single crystals under magnetic fields up to 15 T. The lattice distortion in the antiferromagnetic (AF) state, which is opposite to that in the dimerized (D) phase, exhibits unusual magnetic-field dependence for x = 0.01, where the AF state coexists with the D state. The lattice distortion due to AF ordering is rapidly suppressed and in its place, the lattice distortion due to the dimerization is enhanced by magnetic field up to ∼7 T. Anomalies in the thermal expansion and specific heat at TN are very small at ∼7 T in contrast with their clear anomalies in lower and higher magnetic fields. These indicate that the nature of the AF state is largely changed by the magnetic field and that the electronic state below and above TN is not so different at ∼7 T. Such unusual behavior in a magnetic field is not observed in the AF state for x = 0.02, where there exists only AF ordering.",
author = "M. Sera and K. Yamamoto and M. Hiroi and N. Kobayashi and O. Fujita and A. Ogiwara and Jun Akimitsu",
year = "1997",
month = "12",
day = "1",
language = "English",
volume = "56",
pages = "14771--14775",
journal = "Physical Review B-Condensed Matter",
issn = "1098-0121",
publisher = "American Physical Society",
number = "22",

}

TY - JOUR

T1 - Unusual antiferromagnetic state in the dimerized phase in CuGe1-xSixO3 studied by lattice distortion

AU - Sera, M.

AU - Yamamoto, K.

AU - Hiroi, M.

AU - Kobayashi, N.

AU - Fujita, O.

AU - Ogiwara, A.

AU - Akimitsu, Jun

PY - 1997/12/1

Y1 - 1997/12/1

N2 - We have studied the thermal expansion and magnetostriction of CuGe1-xSixO3 (x = 0, 0.01, 0.015, and 0.02) single crystals under magnetic fields up to 15 T. The lattice distortion in the antiferromagnetic (AF) state, which is opposite to that in the dimerized (D) phase, exhibits unusual magnetic-field dependence for x = 0.01, where the AF state coexists with the D state. The lattice distortion due to AF ordering is rapidly suppressed and in its place, the lattice distortion due to the dimerization is enhanced by magnetic field up to ∼7 T. Anomalies in the thermal expansion and specific heat at TN are very small at ∼7 T in contrast with their clear anomalies in lower and higher magnetic fields. These indicate that the nature of the AF state is largely changed by the magnetic field and that the electronic state below and above TN is not so different at ∼7 T. Such unusual behavior in a magnetic field is not observed in the AF state for x = 0.02, where there exists only AF ordering.

AB - We have studied the thermal expansion and magnetostriction of CuGe1-xSixO3 (x = 0, 0.01, 0.015, and 0.02) single crystals under magnetic fields up to 15 T. The lattice distortion in the antiferromagnetic (AF) state, which is opposite to that in the dimerized (D) phase, exhibits unusual magnetic-field dependence for x = 0.01, where the AF state coexists with the D state. The lattice distortion due to AF ordering is rapidly suppressed and in its place, the lattice distortion due to the dimerization is enhanced by magnetic field up to ∼7 T. Anomalies in the thermal expansion and specific heat at TN are very small at ∼7 T in contrast with their clear anomalies in lower and higher magnetic fields. These indicate that the nature of the AF state is largely changed by the magnetic field and that the electronic state below and above TN is not so different at ∼7 T. Such unusual behavior in a magnetic field is not observed in the AF state for x = 0.02, where there exists only AF ordering.

UR - http://www.scopus.com/inward/record.url?scp=0042439200&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0042439200&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0042439200

VL - 56

SP - 14771

EP - 14775

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 22

ER -