Pressure effects on an S = 1/2 Heisenberg two-leg ladder antiferromagnet Cu2(C5H12N2)2 Cl4

M. Mito, H. Akama, Tatsuya Kawae, K. Takeda, H. Deguchi, S. Takagi

Research output: Contribution to journalArticle

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Abstract

The pressure effects on an S = 1/2 Heisenberg two-leg ladder antiferromagnet (H2LLAF) Cu2(C5H12 N2)2Cl4 have been investigated through magnetic and thermal measurements under pressures up to 10 kbar. The exchange interactions along the rung and leg hardly change under pressures, but the pressurization induces paramagnetic spins and magnetic or0der. This magnetic order is a pressure-induced one observed in a quantum spin system with an energy gap. The amount of induced paramagnetic spins increases almost in accordance with the square of pressure. The magnetic field dependence of the pressure-induced Schottky-type heat capacity suggests that the induced paramagnetic spins are not completely free, but weakly correlate with the H2LLAF system. A magnetic anomaly of the heat capacity has been observed around 2.6 K for P ≥8.5 kbar, where more than 20% of the paramagnetic spins are induced. This anomaly is considered to be intrinsic to the magnetic order of the H2LLAF system, which seems to be triggered by the modulation of the staggered moment due to local defects. Even below the magnetic ordering temperature, the paramagnetic spins coexit with the magnetic order of the H2LLAF system. These pressure effects are similar to the impurity effects in another typical S = 1/2 H2LLAF SrCu2O3 doped with nonmagnetic Zn2+ ions.

Original languageEnglish
Article number104405
Pages (from-to)1044051-1044057
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number10
Publication statusPublished - Mar 1 2002

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Pressure effects
Ladders
pressure effects
ladders
Specific heat
specific heat
Pressurization
Exchange interactions
magnetic anomalies
Magnetization
Energy gap
magnetic measurement
Modulation
Impurities
Ions
Magnetic fields
Defects
anomalies
moments
modulation

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Mito, M., Akama, H., Kawae, T., Takeda, K., Deguchi, H., & Takagi, S. (2002). Pressure effects on an S = 1/2 Heisenberg two-leg ladder antiferromagnet Cu2(C5H12N2)2 Cl4. Physical Review B - Condensed Matter and Materials Physics, 65(10), 1044051-1044057. [104405].

Pressure effects on an S = 1/2 Heisenberg two-leg ladder antiferromagnet Cu2(C5H12N2)2 Cl4. / Mito, M.; Akama, H.; Kawae, Tatsuya; Takeda, K.; Deguchi, H.; Takagi, S.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 65, No. 10, 104405, 01.03.2002, p. 1044051-1044057.

Research output: Contribution to journalArticle

Mito, M, Akama, H, Kawae, T, Takeda, K, Deguchi, H & Takagi, S 2002, 'Pressure effects on an S = 1/2 Heisenberg two-leg ladder antiferromagnet Cu2(C5H12N2)2 Cl4', Physical Review B - Condensed Matter and Materials Physics, vol. 65, no. 10, 104405, pp. 1044051-1044057.
Mito, M. ; Akama, H. ; Kawae, Tatsuya ; Takeda, K. ; Deguchi, H. ; Takagi, S. / Pressure effects on an S = 1/2 Heisenberg two-leg ladder antiferromagnet Cu2(C5H12N2)2 Cl4. In: Physical Review B - Condensed Matter and Materials Physics. 2002 ; Vol. 65, No. 10. pp. 1044051-1044057.
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