Low-Temperature Lattice Effects in the Spin-Liquid Candidate κ-(BEDT-TTF)2Cu2(CN)3
Abstract
The quasi-two-dimensional organic charge-transfer salt κ-(BEDT-TTF)2Cu2(CN)3 is one of the prime candidates for a quantum spin-liquid due the strong spin frustration of its anisotropic triangular lattice in combination with its proximity to the Mott transition. Despite intensive investigations of the material’s low-temperature properties, several important questions remain to be answered. Particularly puzzling are the 6 K anomaly and the enigmatic effects observed in magnetic fields. Here we report on low-temperature measurements of lattice effects which were shown to be particularly strongly pronounced in this material. A special focus of our study lies on sample-to-sample variations of these effects and their implications on the interpretation of experimental data. By investigating overall nine single crystals from two different batches, we can state that there are considerable differences in the size of the second-order phase transition anomaly around 6 K, varying within a factor of 3. In addition, we find field-induced anomalies giving rise to pronounced features in the sample length for two out of these nine crystals for temperatures T< 9 K. We tentatively assign the latter effects to B-induced magnetic clusters suspected to nucleate around crystal imperfections. These B-induced effects are absent for the crystals where the 6 K anomaly ismore »
- Authors:
-
- IIT Tirupati, Tirupati (India); Goethe Univ. Frankfurt (M), Frankfurt (M) (Germany)
- Goethe Univ. Frankfurt (M), Frankfurt (M) (Germany)
- National Science Foundation, Arlington, VA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
- Goethe Univ. Frankfurt (M), Frankfurt (M) (Germany); Univ. Estadual Paulista, Sao Paulo (Brazil)
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- German Research Foundation (DFG); USDOE
- OSTI Identifier:
- 1488414
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Crystals
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 2; Journal ID: ISSN 2073-4352
- Publisher:
- MDPI
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; organic compounds; quantum spin frustration; quantum spin liquids; thermal expansion
Citation Formats
Manna, Rudra Sekhar, Hartmann, Steffi, Gati, Elena, Schlueter, John, de Souza, Mariano, and Lang, Michael. Low-Temperature Lattice Effects in the Spin-Liquid Candidate κ-(BEDT-TTF)2Cu2(CN)3. United States: N. p., 2018.
Web. doi:10.3390/cryst8020087.
Manna, Rudra Sekhar, Hartmann, Steffi, Gati, Elena, Schlueter, John, de Souza, Mariano, & Lang, Michael. Low-Temperature Lattice Effects in the Spin-Liquid Candidate κ-(BEDT-TTF)2Cu2(CN)3. United States. https://doi.org/10.3390/cryst8020087
Manna, Rudra Sekhar, Hartmann, Steffi, Gati, Elena, Schlueter, John, de Souza, Mariano, and Lang, Michael. Tue .
"Low-Temperature Lattice Effects in the Spin-Liquid Candidate κ-(BEDT-TTF)2Cu2(CN)3". United States. https://doi.org/10.3390/cryst8020087. https://www.osti.gov/servlets/purl/1488414.
@article{osti_1488414,
title = {Low-Temperature Lattice Effects in the Spin-Liquid Candidate κ-(BEDT-TTF)2Cu2(CN)3},
author = {Manna, Rudra Sekhar and Hartmann, Steffi and Gati, Elena and Schlueter, John and de Souza, Mariano and Lang, Michael},
abstractNote = {The quasi-two-dimensional organic charge-transfer salt κ-(BEDT-TTF)2Cu2(CN)3 is one of the prime candidates for a quantum spin-liquid due the strong spin frustration of its anisotropic triangular lattice in combination with its proximity to the Mott transition. Despite intensive investigations of the material’s low-temperature properties, several important questions remain to be answered. Particularly puzzling are the 6 K anomaly and the enigmatic effects observed in magnetic fields. Here we report on low-temperature measurements of lattice effects which were shown to be particularly strongly pronounced in this material. A special focus of our study lies on sample-to-sample variations of these effects and their implications on the interpretation of experimental data. By investigating overall nine single crystals from two different batches, we can state that there are considerable differences in the size of the second-order phase transition anomaly around 6 K, varying within a factor of 3. In addition, we find field-induced anomalies giving rise to pronounced features in the sample length for two out of these nine crystals for temperatures T< 9 K. We tentatively assign the latter effects to B-induced magnetic clusters suspected to nucleate around crystal imperfections. These B-induced effects are absent for the crystals where the 6 K anomaly is most strongly pronounced. The large lattice effects observed at 6 K are consistent with proposed pairing instabilities of fermionic excitations breaking the lattice symmetry. The strong sample-to-sample variation in the size of the phase transition anomaly suggests that the conversion of the fermions to bosons at the instability is only partial and to some extent influenced by not yet identified sample-specific parameters.},
doi = {10.3390/cryst8020087},
journal = {Crystals},
number = 2,
volume = 8,
place = {United States},
year = {Tue Feb 06 00:00:00 EST 2018},
month = {Tue Feb 06 00:00:00 EST 2018}
}
Web of Science
Figures / Tables:
Works referenced in this record:
Apparatus for measuring the thermal expansion of solids between 1.5 and 380K
journal, May 1983
- Pott, R.; Schefzyk, R.
- Journal of Physics E: Scientific Instruments, Vol. 16, Issue 5
Novel local symmetries and chiral-symmetry-broken phases in S=(1/2 triangular-lattice Heisenberg model
journal, November 1989
- Baskaran, G.
- Physical Review Letters, Vol. 63, Issue 22
Amperean Pairing Instability in the U(1) Spin Liquid State with Fermi Surface and Application to
journal, February 2007
- Lee, Sung-Sik; Lee, Patrick A.; Senthil, T.
- Physical Review Letters, Vol. 98, Issue 6
Lattice Effects and Entropy Release at the Low-Temperature Phase Transition in the Spin-Liquid Candidate
journal, January 2010
- Manna, R. S.; de Souza, M.; Brühl, A.
- Physical Review Letters, Vol. 104, Issue 1
Phase Transition of the Two-Dimensional Heisenberg Antiferromagnet on the Triangular Lattice
journal, December 1984
- Kawamura, Hikaru; Miyashita, Seiji
- Journal of the Physical Society of Japan, Vol. 53, Issue 12
Thermodynamic properties of a spin-1/2 spin-liquid state in a κ-type organic salt
journal, April 2008
- Yamashita, Satoshi; Nakazawa, Yasuhiro; Oguni, Masaharu
- Nature Physics, Vol. 4, Issue 6
Spin-Triplet Pairing Instability of the Spinon Fermi Surface in a Spin Liquid
journal, December 2007
- Galitski, Victor; Kim, Yong Baek
- Physical Review Letters, Vol. 99, Issue 26
Field-induced length changes in the spin-liquid candidate κ-(BEDT-TTF)2Cu2(CN)3
journal, March 2012
- Manna, Rudra Sekhar; de Souza, Mariano; Schlueter, John A.
- physica status solidi (c), Vol. 9, Issue 5
Emergence of inhomogeneous moments from spin liquid in the triangular-lattice Mott insulator
journal, April 2006
- Shimizu, Y.; Miyagawa, K.; Kanoda, K.
- Physical Review B, Vol. 73, Issue 14
Evidence for Core-Shell Magnetic Behavior in Antiferromagnetic Nanowires
journal, August 2008
- Benitez, M. J.; Petracic, O.; Salabas, E. L.
- Physical Review Letters, Vol. 101, Issue 9
Nonmagnetic impurities in a frustrated triangular antiferromagnet: Broadening of NMR lines in
journal, January 2009
- Gregor, Karol; Motrunich, Olexei I.
- Physical Review B, Vol. 79, Issue 2
Thermal-Transport Studies on Two-Dimensional Quantum Spin Liquids
journal, October 2011
- Yamashita, Minoru; Shibauchi, Takasada; Matsuda, Yuji
- ChemPhysChem, Vol. 13, Issue 1
Thermal-transport measurements in a quantum spin-liquid state of the frustrated triangular magnet κ-(BEDT-TTF)2Cu2(CN)3
journal, November 2008
- Yamashita, Minoru; Nakata, Norihito; Kasahara, Yuichi
- Nature Physics, Vol. 5, Issue 1
Ultrasonic investigation of the transition at 6 K in the spin-liquid candidate -(BEDT-TTF)
journal, January 2014
- Poirier, Mario; de Lafontaine, Mathieu; Miyagawa, Kazuya
- Physical Review B, Vol. 89, Issue 4
Magnetodielectric effects and spin-charge coupling in the spin-liquid candidate -(BEDT-TTF) Cu (CN)
journal, April 2012
- Poirier, Mario; Parent, Samuel; Côté, Alex
- Physical Review B, Vol. 85, Issue 13
Weak Mott insulators on the triangular lattice: Possibility of a gapless nematic quantum spin liquid
journal, June 2010
- Grover, Tarun; Trivedi, N.; Senthil, T.
- Physical Review B, Vol. 81, Issue 24
Superconductivity at 2.8 K and 1.5 kbar in .kappa.-(BEDT-TTF)2Cu2(CN)3: the first organic superconductor containing a polymeric copper cyanide anion
journal, June 1991
- Geiser, Urs.; Wang, Hau H.; Carlson, K. Douglas.
- Inorganic Chemistry, Vol. 30, Issue 12
Temperature dependence of structural and electronic properties of the spin-liquid candidate -(BEDT-TTF) Cu (CN)
journal, January 2012
- Jeschke, Harald O.; de Souza, Mariano; Valentí, Roser
- Physical Review B, Vol. 85, Issue 3
Spin Liquid State in an Organic Mott Insulator with a Triangular Lattice
journal, September 2003
- Shimizu, Y.; Miyagawa, K.; Kanoda, K.
- Physical Review Letters, Vol. 91, Issue 10
Magnetic and non-magnetic phases of a quantum spin liquid
journal, March 2011
- Pratt, F. L.; Baker, P. J.; Blundell, S. J.
- Nature, Vol. 471, Issue 7340
Breakdown of Hooke’s law of elasticity at the Mott critical endpoint in an organic conductor
journal, December 2016
- Gati, Elena; Garst, Markus; Manna, Rudra S.
- Science Advances, Vol. 2, Issue 12
Insulator-metal transition on the triangular lattice
journal, April 2008
- Qi, Yang; Sachdev, Subir
- Physical Review B, Vol. 77, Issue 16
Works referencing / citing this record:
Thermal Expansion Studies on the Spin‐Liquid‐Candidate System κ‐(BEDT‐TTF) 2 Ag 2 (CN) 3
journal, February 2019
- Hartmann, Steffi; Gati, Elena; Yoshida, Yukihiro
- physica status solidi (b), Vol. 256, Issue 9
Electrodynamics in Organic Dimer Insulators Close to Mott Critical Point
journal, April 2018
- Pinterić, Marko; Rivas Góngora, David; Rapljenović, Željko
- Crystals, Vol. 8, Issue 5
Figures / Tables found in this record: