Microscopic evidence for significant ionic disorder in the Yb 3+-chain in Yb4(As1-x Px)3: 31P NMR studies

Hiroshi Tanida, Shigeru Takagi, Hidekazu Aoki, Akira Ochiai

Research output: Contribution to journalArticlepeer-review

Abstract

We report unambiguous microscopic evidence from 31P NMR under Hext ≅ 7.3 T for significant ionic disorder in the Y b 3+ chain in Yb4(As1-x Px) 3 (x = 0.05 and 0.40), which have similar characteristic χ(T) and Cp(T, Hext) behavior to the antiferromagnetic quantum spin chain (AFQSC) system Yb4As3. Our conclusion is based on the observations only below the charge-ordering transition at T0 ≅ 292 K of clear structures in the spectrum, which can be fitted well by the superpositions of almost equally spaced five Gaussian components. Since perfect ordering of Yb3+ in the chain sites would lead to a single-line spectrum also below T0, the structures should be ascribed to significant ionic disorder in the Yb3+ chain and resulting distribution of local configurations of Yb3+ in the eight nearest-neighboring Yb sites around 31P. Quantitative comparisons with a simple model show that about 1/3 and at least 10% of the chain sites are disordered, namely occupied by Yb2+, for x = 0.40 and 0.05, respectively. Combining with previous other experimental results, extreme robustness against the disorder in the Yb3+ chain is deduced for the characteristic χ(Ê) and Cp(T, Hext) behavior normally attributed to the AFQSC.

Original languageEnglish
Pages (from-to)1231-1237
Number of pages7
Journaljournal of the physical society of japan
Volume72
Issue number5
DOIs
Publication statusPublished - 2003 May 1

Keywords

  • Disorder
  • P NMR
  • Quantum spin chain
  • Yb compound
  • Yb(AsP)
  • YbAs

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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