Submillimeter Wave ESR Study of Spin Gap Excitations in CuGeO3

Hiroyuki Nojiri; Hitoshi Ohta; Susumu Okubo; Osamu Fujita; Jun Akimitsu; Mitsuhiro Motokawa

doi:10.1143/JPSJ.68.3417

Submillimeter Wave ESR Study of Spin Gap Excitations in CuGeO₃

Hiroyuki Nojiri, Hitoshi Ohta, Susumu Okubo, Osamu Fujita, Jun Akimitsu, Mitsuhiro Motokawa

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

50 Citations (Scopus)

Abstract

Transitions between the ground singlet state and the excited triplet state have been observed in CuGeO₃ by means of submillimeter wave electron spin resonance. The energy gap at zero field is evaluated to be 570 GHz (2.36 meV) and this value is nearly identical to the gap at the zone center observed by inelastic neutron scattering. The absorption intensity shows strong field orientation dependence, but it shows no significant dependence on magnetic field intensity. These features have been explained by considering the existence of Dzyaloshinsky-Moriya (DM) antisymmetric exchange interaction. The doping effect on this singlet-triplet excitation has been also studied. A drastic broadening of the absorption line is observed by the doping of only 0.5 % of Si.

Original language	English
Pages (from-to)	3417-3423
Number of pages	7
Journal	journal of the physical society of japan
Volume	68
Issue number	10
DOIs	https://doi.org/10.1143/JPSJ.68.3417
Publication status	Published - Oct 1999
Externally published	Yes

Keywords

CuGeO
High magnetic field
Magnetic excitation
Spin gap
Submillimeter wave ESR

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.68.3417

Cite this

@article{07736db35ed842cdb0d49622d9b6d5bb,

title = "Submillimeter Wave ESR Study of Spin Gap Excitations in CuGeO3",

abstract = "Transitions between the ground singlet state and the excited triplet state have been observed in CuGeO3 by means of submillimeter wave electron spin resonance. The energy gap at zero field is evaluated to be 570 GHz (2.36 meV) and this value is nearly identical to the gap at the zone center observed by inelastic neutron scattering. The absorption intensity shows strong field orientation dependence, but it shows no significant dependence on magnetic field intensity. These features have been explained by considering the existence of Dzyaloshinsky-Moriya (DM) antisymmetric exchange interaction. The doping effect on this singlet-triplet excitation has been also studied. A drastic broadening of the absorption line is observed by the doping of only 0.5 % of Si.",

keywords = "CuGeO, High magnetic field, Magnetic excitation, Spin gap, Submillimeter wave ESR",

author = "Hiroyuki Nojiri and Hitoshi Ohta and Susumu Okubo and Osamu Fujita and Jun Akimitsu and Mitsuhiro Motokawa",

year = "1999",

month = oct,

doi = "10.1143/JPSJ.68.3417",

language = "English",

volume = "68",

pages = "3417--3423",

journal = "journal of the physical society of japan",

issn = "0031-9015",

publisher = "Physical Society of Japan",

number = "10",

}

TY - JOUR

T1 - Submillimeter Wave ESR Study of Spin Gap Excitations in CuGeO3

AU - Nojiri, Hiroyuki

AU - Ohta, Hitoshi

AU - Okubo, Susumu

AU - Fujita, Osamu

AU - Akimitsu, Jun

AU - Motokawa, Mitsuhiro

PY - 1999/10

Y1 - 1999/10

N2 - Transitions between the ground singlet state and the excited triplet state have been observed in CuGeO3 by means of submillimeter wave electron spin resonance. The energy gap at zero field is evaluated to be 570 GHz (2.36 meV) and this value is nearly identical to the gap at the zone center observed by inelastic neutron scattering. The absorption intensity shows strong field orientation dependence, but it shows no significant dependence on magnetic field intensity. These features have been explained by considering the existence of Dzyaloshinsky-Moriya (DM) antisymmetric exchange interaction. The doping effect on this singlet-triplet excitation has been also studied. A drastic broadening of the absorption line is observed by the doping of only 0.5 % of Si.

AB - Transitions between the ground singlet state and the excited triplet state have been observed in CuGeO3 by means of submillimeter wave electron spin resonance. The energy gap at zero field is evaluated to be 570 GHz (2.36 meV) and this value is nearly identical to the gap at the zone center observed by inelastic neutron scattering. The absorption intensity shows strong field orientation dependence, but it shows no significant dependence on magnetic field intensity. These features have been explained by considering the existence of Dzyaloshinsky-Moriya (DM) antisymmetric exchange interaction. The doping effect on this singlet-triplet excitation has been also studied. A drastic broadening of the absorption line is observed by the doping of only 0.5 % of Si.

KW - CuGeO

KW - High magnetic field

KW - Magnetic excitation

KW - Spin gap

KW - Submillimeter wave ESR

UR - http://www.scopus.com/inward/record.url?scp=0033271267&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0033271267&partnerID=8YFLogxK

U2 - 10.1143/JPSJ.68.3417

DO - 10.1143/JPSJ.68.3417

M3 - Article

AN - SCOPUS:0033271267

SN - 0031-9015

VL - 68

SP - 3417

EP - 3423

JO - journal of the physical society of japan

JF - journal of the physical society of japan

IS - 10

ER -