Pressure-induced half-collapsed-tetragonal phase in
Abstract
Here, we report the temperature-pressure phase diagram of CaKFe4As4 established using high-pressure electrical resistivity, magnetization, and high-energy x-ray diffraction measurements up to 6 GPa. With increasing pressure, both resistivity and magnetization data show that the bulk superconducting transition of CaKFe4As4 is suppressed and then disappears at p ≳ 4 GPa. High-pressure x-ray data clearly indicate a phase transition to a collapsed tetragonal phase in CaKFe4As4 under pressure that coincides with the abrupt loss of bulk superconductivity near 4 GPa. The x-ray data, combined with resistivity data, indicate that the collapsed tetragonal transition line is essentially independent of pressure, occurring at 4.0(5) GPa for temperatures below 150 K. Density functional theory calculations also find a sudden transition to a collapsed tetragonal state near 4 GPa, as As-As bonding develops across the Ca layer. Bonding across the K layer only occurs for p ≥ 12 GPa. These findings demonstrate a different type of collapsed tetragonal phase in CaKFe4As4 as compared to CaFe2As2: a half-collapsed tetragonal phase.
- Authors:
-
- Ames Lab. and Iowa State Univ., Ames, IA (United States)
- Ames Lab. and Iowa State Univ., Ames, IA (United States); Univ. of California, Davis, CA (United States)
- Goethe Univ. Frankfurt am Main, Frankfurt am Main (Germany)
- Ames Lab. and Iowa State Univ., Ames, IA (United States); Princeton Univ., Princeton, NJ (United States)
- Publication Date:
- Research Org.:
- Ames Lab., Ames, IA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1406563
- Alternate Identifier(s):
- OSTI ID: 1395910
- Report Number(s):
- IS-J-9469
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1703266
- Grant/Contract Number:
- AC02-07CH11358; AC02-06CH11357; SFB/TR49
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 96; Journal Issue: 14; 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
Kaluarachchi, Udhara S., Taufour, Valentin, Sapkota, Aashish, Borisov, Vladislav, Kong, Tai, Meier, William R., Kothapalli, Karunakar, Ueland, Benjamin G., Kreyssig, Andreas, Valenti, Roser, McQueeney, Robert J., Goldman, Alan I., Bud'ko, Sergey L., and Canfield, Paul C. Pressure-induced half-collapsed-tetragonal phase in CaKFe4As4. United States: N. p., 2017.
Web. doi:10.1103/PhysRevB.96.140501.
Kaluarachchi, Udhara S., Taufour, Valentin, Sapkota, Aashish, Borisov, Vladislav, Kong, Tai, Meier, William R., Kothapalli, Karunakar, Ueland, Benjamin G., Kreyssig, Andreas, Valenti, Roser, McQueeney, Robert J., Goldman, Alan I., Bud'ko, Sergey L., & Canfield, Paul C. Pressure-induced half-collapsed-tetragonal phase in CaKFe4As4. United States. https://doi.org/10.1103/PhysRevB.96.140501
Kaluarachchi, Udhara S., Taufour, Valentin, Sapkota, Aashish, Borisov, Vladislav, Kong, Tai, Meier, William R., Kothapalli, Karunakar, Ueland, Benjamin G., Kreyssig, Andreas, Valenti, Roser, McQueeney, Robert J., Goldman, Alan I., Bud'ko, Sergey L., and Canfield, Paul C. Mon .
"Pressure-induced half-collapsed-tetragonal phase in CaKFe4As4". United States. https://doi.org/10.1103/PhysRevB.96.140501. https://www.osti.gov/servlets/purl/1406563.
@article{osti_1406563,
title = {Pressure-induced half-collapsed-tetragonal phase in CaKFe4As4},
author = {Kaluarachchi, Udhara S. and Taufour, Valentin and Sapkota, Aashish and Borisov, Vladislav and Kong, Tai and Meier, William R. and Kothapalli, Karunakar and Ueland, Benjamin G. and Kreyssig, Andreas and Valenti, Roser and McQueeney, Robert J. and Goldman, Alan I. and Bud'ko, Sergey L. and Canfield, Paul C.},
abstractNote = {Here, we report the temperature-pressure phase diagram of CaKFe4As4 established using high-pressure electrical resistivity, magnetization, and high-energy x-ray diffraction measurements up to 6 GPa. With increasing pressure, both resistivity and magnetization data show that the bulk superconducting transition of CaKFe4As4 is suppressed and then disappears at p ≳ 4 GPa. High-pressure x-ray data clearly indicate a phase transition to a collapsed tetragonal phase in CaKFe4As4 under pressure that coincides with the abrupt loss of bulk superconductivity near 4 GPa. The x-ray data, combined with resistivity data, indicate that the collapsed tetragonal transition line is essentially independent of pressure, occurring at 4.0(5) GPa for temperatures below 150 K. Density functional theory calculations also find a sudden transition to a collapsed tetragonal state near 4 GPa, as As-As bonding develops across the Ca layer. Bonding across the K layer only occurs for p ≥ 12 GPa. These findings demonstrate a different type of collapsed tetragonal phase in CaKFe4As4 as compared to CaFe2As2: a half-collapsed tetragonal phase.},
doi = {10.1103/PhysRevB.96.140501},
journal = {Physical Review B},
number = 14,
volume = 96,
place = {United States},
year = {Mon Oct 02 00:00:00 EDT 2017},
month = {Mon Oct 02 00:00:00 EDT 2017}
}
Web of Science
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