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Title: Orbital-and spin-driven lattice instabilities in quasi-one-dimensional CaV 2O 4

Abstract

Here, calcium vanadate CaV 2O 4 has a crystal structure of quasi-one-dimensional zigzag chains composed of orbital-active V 3+ 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 CaV 2O 4. 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 V 3+ 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 CaV 2O 4.

Authors:
 [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)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1477195
Alternate Identifier(s):
OSTI ID: 1474000
Report Number(s):
IS-J-9773
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
17K05520; AC02-07CH11358
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 9; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Watanabe, T., Kobayashi, S., Hara, Y., Xu, J., Lake, B., Yan, J. -Q., Niazi, A., and Johnston, D. C. Orbital-and spin-driven lattice instabilities in quasi-one-dimensional CaV2O4. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.98.094427.
Watanabe, T., Kobayashi, S., Hara, Y., Xu, J., Lake, B., Yan, J. -Q., Niazi, A., & Johnston, D. C. Orbital-and spin-driven lattice instabilities in quasi-one-dimensional CaV2O4. United States. doi:10.1103/PhysRevB.98.094427.
Watanabe, T., Kobayashi, S., Hara, Y., Xu, J., Lake, B., Yan, J. -Q., Niazi, A., and Johnston, D. C. Wed . "Orbital-and spin-driven lattice instabilities in quasi-one-dimensional CaV2O4". United States. doi:10.1103/PhysRevB.98.094427. https://www.osti.gov/servlets/purl/1477195.
@article{osti_1477195,
title = {Orbital-and spin-driven lattice instabilities in quasi-one-dimensional CaV2O4},
author = {Watanabe, T. and Kobayashi, S. and Hara, Y. and Xu, J. and Lake, B. and Yan, J. -Q. and Niazi, A. and Johnston, D. C.},
abstractNote = {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.},
doi = {10.1103/PhysRevB.98.094427},
journal = {Physical Review B},
number = 9,
volume = 98,
place = {United States},
year = {2018},
month = {9}
}

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