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 journalArticlepeer-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 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.

Original languageEnglish
Pages (from-to)732-735
Number of pages4
Journaljournal of the physical society of japan
Volume68
Issue number3
DOIs
Publication statusPublished - 1999 Mar
Externally publishedYes

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'High field phase transitions of quasi one-dimensional S = 1/2 heisenberg antiferromagnet Cu<sub>2</sub>(1,4-diazacycloheptane)<sub>2</sub>Cl<sub>4</sub> observed by submillimeter wave ESR'. Together they form a unique fingerprint.

Cite this