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Hoshino N, Hayashi A, Akutagawa T. The strong correlations between thermal conductivities and electronic spin states in crystals of Fe(III) spin crossover complexes. Dalton Trans 2022; 51:12698-12703. [DOI: 10.1039/d2dt01597h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Solids that change their thermal conductivity during a phase transition can be useful in the development of a thermal switch to allow control of heat flow and reduce energy consumption....
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Tanatar MA, Bondarenko VA, Timmons EI, Prozorov R. Modular portable unit for thermal conductivity measurements in multiple cryogenic/magnetic field environments. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:013903. [PMID: 29390721 DOI: 10.1063/1.5001708] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A modular design for a miniature thermal conductivity cell suitable for a dilution refrigerator and other sample-in-vacuum cryogenic environments with different magnet options is described. The sample is mounted once and the contacts remain in place when the unit is repositioned or transported between different magnets and cryostats. This mobility enables comprehensive measurements with access to specific options, such as vector magnet in one lab and ultra-high field in another. This design enables significant expansion of the temperature range by using not only dilution refrigerators but also 3He, 4He cryostats and even ubiquitous Quantum Design Physical Property Measurement System.
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Affiliation(s)
- M A Tanatar
- Ames Laboratory US DOE, Ames, Iowa 50011, USA
| | | | - E I Timmons
- Ames Laboratory US DOE, Ames, Iowa 50011, USA
| | - R Prozorov
- Ames Laboratory US DOE, Ames, Iowa 50011, USA
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Zhang Q, Li G, Rhodes D, Kiswandhi A, Besara T, Zeng B, Sun J, Siegrist T, Johannes MD, Balicas L. Superconductivity with extremely large upper critical fields in Nb2Pd0.81S5. Sci Rep 2013; 3:1446. [PMID: 23486091 PMCID: PMC3595695 DOI: 10.1038/srep01446] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2012] [Accepted: 02/27/2013] [Indexed: 12/03/2022] Open
Abstract
Here, we report the discovery of superconductivity in a new transition metal-chalcogenide compound, i.e. Nb2Pd0.81S5, with a transition temperature Tc is approximately equal to 6.6 K. Despite its relatively low Tc, it displays remarkably high and anisotropic superconducting upper critical fields, e.g. μ0Hc2 (T → 0 K) > 37 T for fields applied along the crystallographic b-axis. For a field applied perpendicularly to the b-axis, μ0Hc2 shows a linear dependence in temperature which coupled to a temperature-dependent anisotropy of the upper critical fields, suggests that Nb2Pd0.81S5 is a multi-band superconductor. This is consistent with band structure calculations which reveal nearly cylindrical and quasi-one-dimensional Fermi surface sheets having hole and electron character, respectively. The static spin susceptibility as calculated through the random phase approximation, reveals strong peaks suggesting proximity to a magnetic state and therefore the possibility of unconventional superconductivity.
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Affiliation(s)
- Q. Zhang
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
| | - G. Li
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
| | - D. Rhodes
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
| | - A. Kiswandhi
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
- Department of Physics, Florida State University, Tallahassee, Florida 32306-3016, USA
| | - T. Besara
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
| | - B. Zeng
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
| | - J. Sun
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
| | - T. Siegrist
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
- Department of Chemical and Biomedical Engineering, Florida State University, Tallahassee, Florida 32310, USA
| | - M. D. Johannes
- Center for Computational Materials Science, Naval Research Laboratory, Washington, DC 20375, USA
| | - L. Balicas
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
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Podolsky D, Altman E, Rostunov T, Demler E. SO(4) theory of antiferromagnetism and superconductivity in Bechgaard salts. PHYSICAL REVIEW LETTERS 2004; 93:246402. [PMID: 15697836 DOI: 10.1103/physrevlett.93.246402] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2004] [Indexed: 05/24/2023]
Abstract
Motivated by recent experiments with Bechgaard salts, we investigate the competition between antiferromagnetism and triplet superconductivity in quasi-one-dimensional electron systems. We unify the two orders in an SO(4) symmetric framework, demonstrating the existence of such symmetry in one-dimensional Luttinger liquids. SO(4) symmetry strongly constrains the phase diagram, leading to coexistence regions of antiferromagnetic, superconducting, and normal phases, as observed in (TMTSF)(2)PF(6). We predict a sharp neutron scattering resonance in superconducting samples.
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Affiliation(s)
- Daniel Podolsky
- Department of Physics, Harvard University, Cambridge, MA 02138, USA
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Lorenz T, Hofmann M, Grüninger M, Freimuth A, Uhrig GS, Dumm M, Dressel M. Evidence for spin-charge separation in quasi-one-dimensional organic conductors. Nature 2002; 418:614-7. [PMID: 12167854 DOI: 10.1038/nature00913] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Interacting conduction electrons are usually described within Fermi-liquid theory, which states that, in spite of strong interactions, the low-energy excitations are electron-like quasiparticles with charge and spin. In recent years there has been tremendous interest in conducting systems that are not Fermi liquids, motivated by the observation of highly anomalous metallic states in various materials, most notably the copper oxide superconductors. Non-Fermi-liquid behaviour is generic to one-dimensional interacting electron systems, which are predicted to be Luttinger liquids. One of their key properties is spin-charge separation: instead of quasiparticles, collective excitations of charge (with no spin) and spin (with no charge) are formed, which move independently and at different velocities. However, experimental confirmation of spin-charge separation remains a challenge. Here we report experiments probing the charge and heat current in quasi-one-dimensional conductors--the organic Bechgaard salts. It was found that the charge and spin excitations have distinctly different thermal conductivities, which gives strong evidence for spin-charge separation. The spin excitations have a much larger thermal conductivity than the charge excitations, which indicates that the coupling of the charge excitations to the lattice is important.
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Affiliation(s)
- T Lorenz
- II. Physikalisches Institut, Universität zu Köln, 50937 Köln, Germany
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