High field phase transitions of quasi one-dimensional S = 1/2 heisenberg antiferromagnet Cu2(1,4-diazacycloheptane)2Cl4 observed by submillimeter wave ESR

Hitoshi Ohta; Tsuyoshi Tanaka; Susumu Okubo; Shojiro Kimura; Hikomitsu Kikuchi; Hiroshi Nagasawa

doi:10.1143/JPSJ.68.732

High field phase transitions of quasi one-dimensional S = 1/2 heisenberg antiferromagnet Cu₂(1,4-diazacycloheptane)₂Cl₄ observed by submillimeter wave ESR

Hitoshi Ohta, Tsuyoshi Tanaka, Susumu Okubo, Shojiro Kimura, Hikomitsu Kikuchi, Hiroshi Nagasawa

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

16 Citations (Scopus)

Abstract

Millimeter and submillimeter wave ESR measurements on a single crystal of an S = 1/2 Heisenberg ladder-like system Cu₂(C₅H₁₂N₂)₂Cl ₄ have been performed using a pulsed magnetic field up to 16 T. The gap is estimated to be 9.7 K from the temperature dependence of ESR intensity. The detailed frequency dependence of ESR in the frequency region from 40 to 420 GHz at 1.8 K suggests magnetic transitions at H_c1 = 7.5T, H_c2 = 10.1T and H_s = 13.2T. A transition at 10.1T is suggested for the first time. These results are discussed with previous magnetization measurements and theoretical calculations, and our results appear to be difficult to interpret according to the simple ladder model.

Original language	English
Pages (from-to)	732-735
Number of pages	4
Journal	journal of the physical society of japan
Volume	68
Issue number	3
DOIs	https://doi.org/10.1143/JPSJ.68.732
Publication status	Published - 1999 Mar
Externally published	Yes

Keywords

Cu(CHN)Cl
Magnetic phase transition
Millimeter wave ESR
Quantum spin chain
Submillimeter wave ESR

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.68.732

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High field phase transitions of quasi one-dimensional S = 1/2 heisenberg antiferromagnet Cu₂(1,4-diazacycloheptane)₂Cl₄ observed by submillimeter wave ESR. / Ohta, Hitoshi; Tanaka, Tsuyoshi; Okubo, Susumu; Kimura, Shojiro; Kikuchi, Hikomitsu; Nagasawa, Hiroshi.

In: journal of the physical society of japan, Vol. 68, No. 3, 03.1999, p. 732-735.

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

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abstract = "Millimeter and submillimeter wave ESR measurements on a single crystal of an S = 1/2 Heisenberg ladder-like system Cu2(C5H12N2)2Cl 4 have been performed using a pulsed magnetic field up to 16 T. The gap is estimated to be 9.7 K from the temperature dependence of ESR intensity. The detailed frequency dependence of ESR in the frequency region from 40 to 420 GHz at 1.8 K suggests magnetic transitions at Hc1 = 7.5T, Hc2 = 10.1T and Hs = 13.2T. A transition at 10.1T is suggested for the first time. These results are discussed with previous magnetization measurements and theoretical calculations, and our results appear to be difficult to interpret according to the simple ladder model.",

keywords = "Cu(CHN)Cl, Magnetic phase transition, Millimeter wave ESR, Quantum spin chain, Submillimeter wave ESR",

author = "Hitoshi Ohta and Tsuyoshi Tanaka and Susumu Okubo and Shojiro Kimura and Hikomitsu Kikuchi and Hiroshi Nagasawa",

year = "1999",

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T1 - High field phase transitions of quasi one-dimensional S = 1/2 heisenberg antiferromagnet Cu2(1,4-diazacycloheptane)2Cl4 observed by submillimeter wave ESR

AU - Ohta, Hitoshi

AU - Tanaka, Tsuyoshi

AU - Okubo, Susumu

AU - Kimura, Shojiro

AU - Kikuchi, Hikomitsu

AU - Nagasawa, Hiroshi

PY - 1999/3

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N2 - Millimeter and submillimeter wave ESR measurements on a single crystal of an S = 1/2 Heisenberg ladder-like system Cu2(C5H12N2)2Cl 4 have been performed using a pulsed magnetic field up to 16 T. The gap is estimated to be 9.7 K from the temperature dependence of ESR intensity. The detailed frequency dependence of ESR in the frequency region from 40 to 420 GHz at 1.8 K suggests magnetic transitions at Hc1 = 7.5T, Hc2 = 10.1T and Hs = 13.2T. A transition at 10.1T is suggested for the first time. These results are discussed with previous magnetization measurements and theoretical calculations, and our results appear to be difficult to interpret according to the simple ladder model.

AB - Millimeter and submillimeter wave ESR measurements on a single crystal of an S = 1/2 Heisenberg ladder-like system Cu2(C5H12N2)2Cl 4 have been performed using a pulsed magnetic field up to 16 T. The gap is estimated to be 9.7 K from the temperature dependence of ESR intensity. The detailed frequency dependence of ESR in the frequency region from 40 to 420 GHz at 1.8 K suggests magnetic transitions at Hc1 = 7.5T, Hc2 = 10.1T and Hs = 13.2T. A transition at 10.1T is suggested for the first time. These results are discussed with previous magnetization measurements and theoretical calculations, and our results appear to be difficult to interpret according to the simple ladder model.

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KW - Quantum spin chain

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