## Abstract

The specific heat C(T) of the monoclinic RbDy(WO_{4})_{2} crystal has been studied at very low temperatures 0.2 ≤ T ≤ 1.9 K and in magnetic fields 0 ≤ H ≤ 0.38 T. The Neel temperature was shown to be equal to T_{N} = 0.818 ± 0.005 K. The experimental value of the effective exchange parameter was obtained to be equal to J/k = -0.798 K. The C(T) dependence below Neel temperature (0.5 T_{N} < T < 0.99T_{N}) is well described by 2D Ising model, whereas in the temperature region close above T_{N} (1.01T_{N} < T < 2T_{N}) it can be described by neither 2D, nor 3D Ising model. The experimental and theoretical H-T_{N} diagrams for field H ∥ a are in a reasonable agreement for simple quadratic lattice.

Original language | English |
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Pages (from-to) | 1003-1011 |

Number of pages | 9 |

Journal | Journal of Low Temperature Physics |

Volume | 110 |

Issue number | 5-6 |

DOIs | |

State | Published - 1 Jan 1998 |

Externally published | Yes |

## ASJC Scopus subject areas

- Atomic and Molecular Physics, and Optics
- Materials Science (all)
- Condensed Matter Physics

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