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Title: Revealing pressure-driven structural transitions in the hybrid improper ferroelectric Sr3Sn2O7

Journal Article · · Physical Review B
 [1]; ORCiD logo [2];  [3];  [3];  [4];  [4];  [5];  [2]; ORCiD logo [3]
  1. Univ. of Tennessee, Knoxville, TN (United States); University of Illinois at Chicago
  2. Univ. of California, Merced, CA (United States)
  3. Univ. of Tennessee, Knoxville, TN (United States)
  4. Rutgers Univ., Piscataway, NJ (United States)
  5. Univ. of Illinois, Chicago, IL (United States)

In this work, we combine diamond anvil cell techniques and synchrotron-based infrared spectroscopy with a detailed symmetry analysis and lattice dynamics calculations to uncover a series of pressure induced structural phase transitions in the hybrid improper ferroelectric Sr3Sn2O7. The microscopic character of each high pressure phase is determined by comparing the measured spectrum with the predicted vibrational patterns of several related but distinct candidate space groups. Our analysis reveals a sequence of compression-induced transitions from A21am ↔ Pnab ↔ Acaa ↔ I4/mmm at room temperature. Remarkably, this space group progression matches the sequence of temperature-dependent structural transitions observed in Sr3Sn2O7 between 77 and 1000 K. Other hybrid improper ferroelectrics display a similar set of transitions, suggesting that pressure and probably strain will be very effective tuning parameters for this entire class of materials.

Research Organization:
Univ. of Illinois, Chicago, IL (United States); Univ. of Tennessee, Knoxville, TN (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
FG02-01ER45885; NA0003975; SC0012704
OSTI ID:
1820161
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 6 Vol. 104; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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