### Abstract

Magnetic susceptibility and specific heat were measured for a Zn-substituted spin-1/2 Heisenberg two-leg ladder compound Sr((Formula presented)(Formula presented)(Formula presented)(Formula presented) (x⩽0.08) to investigate nonmagnetic impurity effects on the quantum spin system with a large spin gap of about ∼400 K. A clear anomaly attributed to the onset of an antiferromagnetic ordering was observed both in the magnetic susceptibility and the specific heat at low temperature even at only 1% of Zn. The Néel temperature showed a systematic Zn concentration dependence with a broad maximum at around 4% substitution ((Formula presented)∼8 K). A finite amount of a T-linear term with a coefficient of γ∼3.5 mJ/(Formula presented) was observed in the specific heat above (Formula presented) for x=0.02 and 0.04, suggesting that the spin excitation in the substituted compound becomes gapless.

Original language | English |
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Pages (from-to) | R8658-R8661 |

Journal | Physical Review B - Condensed Matter and Materials Physics |

Volume | 55 |

Issue number | 14 |

DOIs | |

Publication status | Published - 1997 |

Externally published | Yes |

### ASJC Scopus subject areas

- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics

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## Cite this

*Physical Review B - Condensed Matter and Materials Physics*,

*55*(14), R8658-R8661. https://doi.org/10.1103/PhysRevB.55.R8658