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Title: Orbital-and spin-driven lattice instabilities in quasi-one-dimensional CaV2O4

Journal Article · · Physical Review B
 [1];  [1];  [2];  [3];  [3];  [4];  [5];  [6]
  1. Nihon Univ., Tokyo (Japan)
  2. Ibaraki College, Hitachinaka (Japan)
  3. Helmholtz-Zentrum Berlin fur Materialien und Energie, Berlin (Germany)
  4. Ames Lab. and Iowa State Univ., Ames, IA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Ames Lab. and Iowa State Univ., Ames, IA (United States); Jamia Millia Islamia, New Delhi (India)
  6. Ames Lab. and Iowa State Univ., Ames, IA (United States)
+ Show Author Affiliations

Here, calcium vanadate CaV2O4 has a crystal structure of quasi-one-dimensional zigzag chains composed of orbital-active V3+ ions and undergoes successive structural and antiferromagnetic phase transitions at Ts~140 K and TN~70 K, respectively. We perform ultrasound velocity measurements on a single crystal of CaV2O4. The temperature dependence of its shear elastic moduli exhibits huge Curie-type softening upon cooling that emerges above and below Ts depending on the elastic mode. The softening above Ts suggests the presence of either onsite Jahn-Teller-type or intersite ferrotype orbital fluctuations in the two inequivalent V3+ zigzag chains. The softening below Ts suggests the occurrence of a dimensional spin-state crossover, from quasi-one to three, that is driven by the spin-lattice coupling along the inter-zigzag-chain orthogonal direction. The successive emergence of the orbital- and spin-driven lattice instabilities above and below Ts, respectively, is unique to the orbital-spin zigzag chain system of CaV2O4.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
17K05520; AC02-07CH11358
OSTI ID:
1477195
Alternate ID(s):
OSTI ID: 1474000
Report Number(s):
IS-J-9773; PRBMDO
Journal Information:
Physical Review B, Vol. 98, Issue 9; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

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