TY - JOUR
T1 - Reinvestigation of simultaneous magnetic and ferroelectric phase transitions in YMn2O5
AU - Kobayashi, Satoru
AU - Osawa, Toshihiro
AU - Kimura, Hiroyuki
AU - Noda, Yukio
AU - Kagomiya, Isao
AU - Kohn, Kay
PY - 2004/6/1
Y1 - 2004/6/1
N2 - Magnetic ordering around the ferroelectric transition temperature T C1 of weakly ferroelectric YMn2O5 has been reinvestigated by single-crystal neutron diffraction and dielectric measurements. Besides a two-dimensionally modulated incommensurate magnetic (2D-ICM) phase with the propagation vector q = (qx, 0, qz) and a lock-in commensurate magnetic (CM) one with q = (1/2, 0, 1/4) reported previously, we observed a 1D-ICM phase characterized by q = (qx, 0, 1/4) with qx∼ 0.492 that appears in a narrow temperature interval of ∼1 K and separates the 2D-ICM and CM phases. Corresponding to the 2D-ICM-to-1D-ICM and 1D-ICM-to-CM phase transitions at T = 40.8 K and 40.0 K, a sharp peak and a shoulder in the dielectric constant along the b-axis were detected. These results suggest that the ferroelectricity appears simultaneously with the magnetic phase transition from the 2D-ICM to 1D-ICM phase in YMn 2O5.
AB - Magnetic ordering around the ferroelectric transition temperature T C1 of weakly ferroelectric YMn2O5 has been reinvestigated by single-crystal neutron diffraction and dielectric measurements. Besides a two-dimensionally modulated incommensurate magnetic (2D-ICM) phase with the propagation vector q = (qx, 0, qz) and a lock-in commensurate magnetic (CM) one with q = (1/2, 0, 1/4) reported previously, we observed a 1D-ICM phase characterized by q = (qx, 0, 1/4) with qx∼ 0.492 that appears in a narrow temperature interval of ∼1 K and separates the 2D-ICM and CM phases. Corresponding to the 2D-ICM-to-1D-ICM and 1D-ICM-to-CM phase transitions at T = 40.8 K and 40.0 K, a sharp peak and a shoulder in the dielectric constant along the b-axis were detected. These results suggest that the ferroelectricity appears simultaneously with the magnetic phase transition from the 2D-ICM to 1D-ICM phase in YMn 2O5.
KW - Dielectric constant
KW - Ferroelectricity
KW - Magnetic phase transition
KW - Neutron diffraction
KW - YMnO
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U2 - 10.1143/JPSJ.73.1593
DO - 10.1143/JPSJ.73.1593
M3 - Article
AN - SCOPUS:9744252526
VL - 73
SP - 1593
EP - 1596
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 6
ER -