Direct observation of the quantum energy gap in s = 1/2 tetragonal cuprate antiferromagnets

K. Katsumata; M. Hagiwara; Z. Honda; J. Satooka; A. Aharony; R. J. Birgeneau; F. C. Chou; O. Entin-Wohlman; A. B. Harris; M. A. Kastner; Y. J. Kim; Y. S. Lee

doi:10.1209/epl/i2001-00276-4

Direct observation of the quantum energy gap in s = 1/2 tetragonal cuprate antiferromagnets

K. Katsumata, M. Hagiwara, Z. Honda, J. Satooka, A. Aharony, R. J. Birgeneau, F. C. Chou, O. Entin-Wohlman, A. B. Harris, M. A. Kastner, Y. J. Kim, Y. S. Lee

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9 Scopus citations

Abstract

Using an electron spin resonance spectrometer covering a wide range of frequency and magnetic field, we have measured the low-energy excitations of the S = 1/2 tetragonal antiferromagnets, Sr₂CuC₂Cl₂ and Sr₂Cu₃O₄Cl₂. Our observations of in-plane energy gaps of order 0.1 meV at zero external magnetic field are consistent with a spin-wave calculation, which includes several kinds of quantum fluctuations that remove frustration. Such gaps vanish for classical spins, and were too small to be observed by other techniques. Results agree with other experiments and with exchange anisotropy parameters determined from a five-band Hubbard model.

Original language	English
Pages (from-to)	508-514
Number of pages	7
Journal	EPL
Volume	54
Issue number	4
DOIs	https://doi.org/10.1209/epl/i2001-00276-4
State	Published - 11 May 2001
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy

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title = "Direct observation of the quantum energy gap in s = 1/2 tetragonal cuprate antiferromagnets",

abstract = "Using an electron spin resonance spectrometer covering a wide range of frequency and magnetic field, we have measured the low-energy excitations of the S = 1/2 tetragonal antiferromagnets, Sr2CuC2Cl2 and Sr2Cu3O4Cl2. Our observations of in-plane energy gaps of order 0.1 meV at zero external magnetic field are consistent with a spin-wave calculation, which includes several kinds of quantum fluctuations that remove frustration. Such gaps vanish for classical spins, and were too small to be observed by other techniques. Results agree with other experiments and with exchange anisotropy parameters determined from a five-band Hubbard model.",

author = "K. Katsumata and M. Hagiwara and Z. Honda and J. Satooka and A. Aharony and Birgeneau, {R. J.} and Chou, {F. C.} and O. Entin-Wohlman and Harris, {A. B.} and Kastner, {M. A.} and Kim, {Y. J.} and Lee, {Y. S.}",

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doi = "10.1209/epl/i2001-00276-4",

language = "English",

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TY - JOUR

T1 - Direct observation of the quantum energy gap in s = 1/2 tetragonal cuprate antiferromagnets

AU - Katsumata, K.

AU - Hagiwara, M.

AU - Honda, Z.

AU - Satooka, J.

AU - Aharony, A.

AU - Birgeneau, R. J.

AU - Chou, F. C.

AU - Entin-Wohlman, O.

AU - Harris, A. B.

AU - Kastner, M. A.

AU - Kim, Y. J.

AU - Lee, Y. S.

PY - 2001/5/11

Y1 - 2001/5/11

N2 - Using an electron spin resonance spectrometer covering a wide range of frequency and magnetic field, we have measured the low-energy excitations of the S = 1/2 tetragonal antiferromagnets, Sr2CuC2Cl2 and Sr2Cu3O4Cl2. Our observations of in-plane energy gaps of order 0.1 meV at zero external magnetic field are consistent with a spin-wave calculation, which includes several kinds of quantum fluctuations that remove frustration. Such gaps vanish for classical spins, and were too small to be observed by other techniques. Results agree with other experiments and with exchange anisotropy parameters determined from a five-band Hubbard model.

AB - Using an electron spin resonance spectrometer covering a wide range of frequency and magnetic field, we have measured the low-energy excitations of the S = 1/2 tetragonal antiferromagnets, Sr2CuC2Cl2 and Sr2Cu3O4Cl2. Our observations of in-plane energy gaps of order 0.1 meV at zero external magnetic field are consistent with a spin-wave calculation, which includes several kinds of quantum fluctuations that remove frustration. Such gaps vanish for classical spins, and were too small to be observed by other techniques. Results agree with other experiments and with exchange anisotropy parameters determined from a five-band Hubbard model.

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DO - 10.1209/epl/i2001-00276-4

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ER -

Direct observation of the quantum energy gap in s = 1/2 tetragonal cuprate antiferromagnets

Abstract

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