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Nomura Y, Sakai S, Capone M, Arita R. Exotic s-wave superconductivity in alkali-doped fullerides. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:153001. [PMID: 26974650 DOI: 10.1088/0953-8984/28/15/153001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Alkali-doped fullerides (A3C60 with A = K, Rb, Cs) show a surprising phase diagram, in which a high transition-temperature (Tc) s-wave superconducting state emerges next to a Mott insulating phase as a function of the lattice spacing. This is in contrast with the common belief that Mott physics and phonon-driven s-wave superconductivity are incompatible, raising a fundamental question on the mechanism of the high-Tc superconductivity. This article reviews recent ab initio calculations, which have succeeded in reproducing comprehensively the experimental phase diagram with high accuracy and elucidated an unusual cooperation between the electron-phonon coupling and the electron-electron interactions leading to Mott localization to realize an unconventional s-wave superconductivity in the alkali-doped fullerides. A driving force behind the exotic physics is unusual intramolecular interactions, characterized by the coexistence of a strongly repulsive Coulomb interaction and a small effectively negative exchange interaction. This is realized by a subtle energy balance between the coupling with the Jahn-Teller phonons and Hund's coupling within the C60 molecule. The unusual form of the interaction leads to a formation of pairs of up- and down-spin electrons on the molecules, which enables the s-wave pairing. The emergent superconductivity crucially relies on the presence of the Jahn-Teller phonons, but surprisingly benefits from the strong correlations because the correlations suppress the kinetic energy of the electrons and help the formation of the electron pairs, in agreement with previous model calculations. This confirms that the alkali-doped fullerides are a new type of unconventional superconductors, where the unusual synergy between the phonons and Coulomb interactions drives the high-Tc superconductivity.
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Affiliation(s)
- Yusuke Nomura
- Department of Applied Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Khasanov R, Guguchia Z, Eremin I, Luetkens H, Amato A, Biswas PK, Rüegg C, Susner MA, Sefat AS, Zhigadlo ND, Morenzoni E. Pressure-induced electronic phase separation of magnetism and superconductivity in CrAs. Sci Rep 2015; 5:13788. [PMID: 26346548 PMCID: PMC4561900 DOI: 10.1038/srep13788] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Accepted: 07/28/2015] [Indexed: 11/30/2022] Open
Abstract
The recent discovery of pressure (p) induced superconductivity in the binary helimagnet CrAs has raised questions on how superconductivity emerges from the magnetic state and on the mechanism of the superconducting pairing. In the present work the suppression of magnetism and the occurrence of superconductivity in CrAs were studied by means of muon spin rotation. The magnetism remains bulk up to p 3.5 kbar while its volume fraction gradually decreases with increasing pressure until it vanishes at p 7 kbar. At 3.5 kbar superconductivity abruptly appears with its maximum Tc 1.2 K which decreases upon increasing the pressure. In the intermediate pressure region (3.5 p 7 kbar) the superconducting and the magnetic volume fractions are spatially phase separated and compete for phase volume. Our results indicate that the less conductive magnetic phase provides additional carriers (doping) to the superconducting parts of the CrAs sample thus leading to an increase of the transition temperature (Tc) and of the superfluid density (ρs). A scaling of ρs with as well as the phase separation between magnetism and superconductivity point to a conventional mechanism of the Cooper-pairing in CrAs.
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Affiliation(s)
- Rustem Khasanov
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Zurab Guguchia
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Ilya Eremin
- Institut für Theoretische Physik III, Ruhr-Universität Bochum, D-44801 Bochum, Germany.,Kazan (Volga region) Federal University, 420008 Kazan, Russia
| | - Hubertus Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Alex Amato
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Pabitra K Biswas
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Christian Rüegg
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.,Department of Quantum Matter Physics, University of Geneva, CH-1211 Geneva, Switzerland
| | - Michael A Susner
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6114, USA
| | - Athena S Sefat
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6114, USA
| | | | - Elvezio Morenzoni
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
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Potočnik A, Krajnc A, Jeglič P, Takabayashi Y, Ganin AY, Prassides K, Rosseinsky MJ, Arčon D. Size and symmetry of the superconducting gap in the f.c.c. Cs3C60 polymorph close to the metal-Mott insulator boundary. Sci Rep 2014; 4:4265. [PMID: 24584087 PMCID: PMC3939459 DOI: 10.1038/srep04265] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2013] [Accepted: 02/17/2014] [Indexed: 11/20/2022] Open
Abstract
The alkali fullerides, A(3)C(60) (A = alkali metal) are molecular superconductors that undergo a transition to a magnetic Mott-insulating state at large lattice parameters. However, although the size and the symmetry of the superconducting gap, Δ, are both crucial for the understanding of the pairing mechanism, they are currently unknown for superconducting fullerides close to the correlation-driven magnetic insulator. Here we report a comprehensive nuclear magnetic resonance (NMR) study of face-centred-cubic (f.c.c.) Cs(3)C(60) polymorph, which can be tuned continuously through the bandwidth-controlled Mott insulator-metal/superconductor transition by pressure. When superconductivity emerges from the insulating state at large interfullerene separations upon compression, we observe an isotropic (s-wave) Δ with a large gap-to-superconducting transition temperature ratio, 2Δ0/k(B)T(c) = 5.3(2) [Δ0 = Δ(0 K)]. 2Δ0/k(B)T(c) decreases continuously upon pressurization until it approaches a value of ~3.5, characteristic of weak-coupling BCS theory of superconductivity despite the dome-shaped dependence of Tc on interfullerene separation. The results indicate the importance of the electronic correlations for the pairing interaction as the metal/superconductor-insulator boundary is approached.
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Affiliation(s)
- Anton Potočnik
- Jožef Stefan Institute, Jamova c. 39, SI-1000 Ljubljana, Slovenia
| | - Andraž Krajnc
- Jožef Stefan Institute, Jamova c. 39, SI-1000 Ljubljana, Slovenia
| | - Peter Jeglič
- Jožef Stefan Institute, Jamova c. 39, SI-1000 Ljubljana, Slovenia
- EN-FIST Centre of Excellence, Dunajska c. 156, SI-1000 Ljubljana, Slovenia
| | | | - Alexey Y. Ganin
- Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, UK
| | - Kosmas Prassides
- Department of Chemistry, Durham University, Durham DH1 3LE, UK
- WPI Research Center, Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | | | - Denis Arčon
- Jožef Stefan Institute, Jamova c. 39, SI-1000 Ljubljana, Slovenia
- Faculty of mathematics and physics, University of Ljubljana, Jadranska c. 19, SI-1000 Ljubljana, Slovenia
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Yu W, Ma L, He JB, Wang DM, Xia TL, Chen GF, Bao W. 77Se NMR study of the pairing symmetry and the spin dynamics in K(y)Fe(2-x)Se2. PHYSICAL REVIEW LETTERS 2011; 106:197001. [PMID: 21668191 DOI: 10.1103/physrevlett.106.197001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2011] [Indexed: 05/30/2023]
Abstract
We present a 77Se NMR study of the newly discovered iron selenide superconductor K(y)Fe(2-x)Se2, in which T(c) = 32 K. Below T(c), the Knight shift 77K drops sharply with temperature, providing strong evidence for singlet pairing. Above T(c), Korringa-type relaxation indicates Fermi-liquid behavior. Our experimental results set strict constraints on the nature of possible theories for the mechanism of high-T(c) superconductivity in this iron selenide system.
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Affiliation(s)
- Weiqiang Yu
- Department of Physics, Renmin University of China, Beijing 100872, China.
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Abstract
We review the development of conductive organic molecular assemblies including organic metals, superconductors, single component conductors, conductive films, conductors with a switching function, and new spin state (quantum spin liquid state). We emphasize the importance of the ionicity phase diagram for a variety of charge transfer systems to provide a strategy for the development of functional organic solids (Mott insulator, semiconductor, superconductor, metal, complex isomer, neutral-ionic system, alignment of chemical potentials, etc.). For organic (super)conductors, the electronic dimensionality of the solids is a key parameter and can be designed based on the self-aggregation ability of a molecule. We present characteristic structural and physical properties of organic superconductors.
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Ihara Y, Alloul H, Wzietek P, Pontiroli D, Mazzani M, Riccò M. NMR study of the Mott transitions to superconductivity in the two Cs3C60 phases. PHYSICAL REVIEW LETTERS 2010; 104:256402. [PMID: 20867402 DOI: 10.1103/physrevlett.104.256402] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2010] [Indexed: 05/29/2023]
Abstract
We report a NMR and magnetometry study on the expanded intercalated fulleride Cs3C60 in both its A15 and face centered cubic structures. NMR allowed us to evidence that both exhibit a first-order Mott transition to a superconducting state, occurring at distinct critical pressures p{c} and temperatures T{c}. Though the ground state magnetism of the Mott phases differs, their high T paramagnetic and superconducting properties are found similar, and the phase diagrams versus unit volume per C60 are superimposed. Thus, as expected for a strongly correlated system, the interball distance is the relevant parameter driving the electronic behavior and quantum transitions of these systems.
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Affiliation(s)
- Y Ihara
- Laboratoire de Physique des Solides, Universite Paris-Sud 11, CNRS UMR 8502, 91405 Orsay, France.
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Curro NJ, Caldwell T, Bauer ED, Morales LA, Graf MJ, Bang Y, Balatsky AV, Thompson JD, Sarrao JL. Unconventional superconductivity in PuCoGa5. Nature 2005; 434:622-5. [PMID: 15800618 DOI: 10.1038/nature03428] [Citation(s) in RCA: 256] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2004] [Accepted: 02/04/2005] [Indexed: 11/08/2022]
Abstract
In the Bardeen-Cooper-Schrieffer theory of superconductivity, electrons form (Cooper) pairs through an interaction mediated by vibrations in the underlying crystal structure. Like lattice vibrations, antiferromagnetic fluctuations can also produce an attractive interaction creating Cooper pairs, though with spin and angular momentum properties different from those of conventional superconductors. Such interactions have been implicated for two disparate classes of materials--the copper oxides and a set of Ce- and U-based compounds. But because their transition temperatures differ by nearly two orders of magnitude, this raises the question of whether a common pairing mechanism applies. PuCoGa5 has a transition temperature intermediate between those classes and therefore may bridge these extremes. Here we report measurements of the nuclear spin-lattice relaxation rate and Knight shift in PuCoGa5, which demonstrate that it is an unconventional superconductor with properties as expected for antiferromagnetically mediated superconductivity. Scaling of the relaxation rates among all of these materials (a feature not exhibited by their Knight shifts) establishes antiferromagnetic fluctuations as a likely mechanism for their unconventional superconductivity and suggests that related classes of exotic superconductors may yet be discovered.
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Affiliation(s)
- N J Curro
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
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Singer PM, Imai T, He T, Hayward MA, Cava RJ. (13)C NMR investigation of the superconductor MgCNi(3) up to 800 K. PHYSICAL REVIEW LETTERS 2001; 87:257601. [PMID: 11736604 DOI: 10.1103/physrevlett.87.257601] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2001] [Indexed: 05/23/2023]
Abstract
We report (13)C NMR characterization of the new superconductor MgCNi(3) [T. He et al., Nature (London) 411, 54 (2001)]. We found that both the uniform spin susceptibility and the spin fluctuations show a strong enhancement with decreasing temperature, and saturate below approximately 50 K and approximately 20 K, respectively. The nuclear spin-lattice relaxation rate 1/(13)T(1) exhibits typical behavior for isotropic s-wave superconductivity with a coherence peak below T(c) = 7.0 K that grows with decreasing magnetic field.
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Affiliation(s)
- P M Singer
- Department of Physics and Center for Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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Kotegawa H, Ishida K, Kitaoka Y, Muranaka T, Akimitsu J. Evidence for strong-coupling s-wave superconductivity in MgB2: (11)B NMR Study. PHYSICAL REVIEW LETTERS 2001; 87:127001. [PMID: 11580540 DOI: 10.1103/physrevlett.87.127001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2001] [Revised: 05/24/2001] [Indexed: 05/23/2023]
Abstract
We have investigated a gap structure in a newly discovered superconductor, MgB2, through measurement of the (11)B nuclear spin-lattice relaxation rate, (11)(1/T(1)). (11)(1/T(1)) is proportional to the temperature (T) in the normal state, and decreases exponentially in the superconducting (SC) state, revealing a tiny coherence peak just below T(c). The T dependence of 1/T(1) in the SC state can be accounted for by an s-wave SC model with a large gap size of 2Delta/k(B)T(c) approximately 5 which suggests it is in a strong-coupling regime.
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Affiliation(s)
- H Kotegawa
- Department of Physical Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
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Knuuttila TA, Tuoriniemi JT, Lefmann K. Relaxation of polarized nuclei in superconducting rhodium. PHYSICAL REVIEW LETTERS 2000; 85:2573-2576. [PMID: 10978110 DOI: 10.1103/physrevlett.85.2573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2000] [Indexed: 05/23/2023]
Abstract
Nuclear spin lattice relaxation rates were measured in normal and superconducting (sc) rhodium with nuclear polarizations up to p = 0. 55. This was sufficient to influence the sc state of Rh, whose T(c) and B(c) are exceptionally low. Because B(c)<<B(loc) and the short-range spin-spin interaction is unchanged, the nuclear spin entropy was fully sustained across the sc transition. The relaxation in the sc state was slower at all temperatures without the coherence enhancement close to T(c). Nonzero nuclear polarization strongly reduced the difference between the relaxation rates in the sc and normal states.
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Affiliation(s)
- TA Knuuttila
- Low Temperature Laboratory, Helsinki University of Technology, P.O. Box 2200, FIN-02015 HUT, Finland
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Hesper R, Tjeng LH, Heeres A, Sawatzky GA. BCS-like density of states in superconducting A3C60 surfaces. PHYSICAL REVIEW LETTERS 2000; 85:1970-1973. [PMID: 10970660 DOI: 10.1103/physrevlett.85.1970] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2000] [Indexed: 05/23/2023]
Abstract
We report on an ultrahigh resolution photoemission study on the topmost molecular layer of K3C60 and Rb3C60 films below and above the superconducting transition temperature T(C). We observed not only clear evidence for the opening of the superconducting gap, but also a modification in the photoemission line shape consistent with a change from a normal-metallic to a BCS-like density of states, including the formation of a condensation peak. The data can be accurately modeled by a BCS-type function with a gap Delta derived from T(C) in the weak-coupling limit ( 2Delta/k(B)T(C) = 3.53).
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Affiliation(s)
- R Hesper
- Solid State Physics Laboratory, Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, the Netherlands
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Kroeker S, Eichele K, Wasylishen RE, Britten JF. Cesium-133 NMR Study of CsCd(SCN)3: Relative Orientation of the Chemical Shift and Electric Field Gradient Tensors. J Phys Chem B 1997. [DOI: 10.1021/jp970043a] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Scott Kroeker
- Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4J3, and Department of Chemistry, McMaster University, Hamilton, Ontario, Canada L8S 4M1
| | - Klaus Eichele
- Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4J3, and Department of Chemistry, McMaster University, Hamilton, Ontario, Canada L8S 4M1
| | - Roderick E. Wasylishen
- Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4J3, and Department of Chemistry, McMaster University, Hamilton, Ontario, Canada L8S 4M1
| | - James F. Britten
- Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4J3, and Department of Chemistry, McMaster University, Hamilton, Ontario, Canada L8S 4M1
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Koller D, Martin MC, Mihály L, Mihály G, Oszlányi G, Baumgartner G, Forró L. Energy Gap in Superconducting Fullerides: Optical and Tunneling Studies. PHYSICAL REVIEW LETTERS 1996; 77:4082-4085. [PMID: 10062383 DOI: 10.1103/physrevlett.77.4082] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Diederichs J, Gangopadhyay AK, Schilling JS. Pressure dependence of the electronic density of states and Tc in superconducting Rb3C60. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:R9662-R9665. [PMID: 9984786 DOI: 10.1103/physrevb.54.r9662] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Maniwa Y, Sugiura D, Kume K, Kikuchi K, Suzuki S, Achiba Y, Hirosawa I, Tanigaki K, Shimoda H, Iwasa Y. Determination of 13C NMR isotropic Knight shift and deviation from BCS relation in A3C60 superconductors. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:R6861-R6864. [PMID: 9984399 DOI: 10.1103/physrevb.54.r6861] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Pennington CH, Hahm C, Stenger VA, Gorny K, Recchia CH, Martindale JA, Buffinger DR, Ziebarth RP. Double-resonance NMR probes of structural distortions in alkali-metal-fulleride superconductors. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:R6853-R6856. [PMID: 9984397 DOI: 10.1103/physrevb.54.r6853] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Neminsky AM, Shovkun DV, Vyaselev OT. ac susceptibility of Rb3C60 fine powder. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:454-461. [PMID: 9984280 DOI: 10.1103/physrevb.54.454] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Choi HY. Finite bandwidth effects on the transition temperature and NMR relaxation rate of impure superconductors. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:8591-8598. [PMID: 9982368 DOI: 10.1103/physrevb.53.8591] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Pennington CH, Stenger VA, Recchia CH, Hahm C, Gorny K, Nandor V, Buffinger DR, Lee SM, Ziebarth RP. 13C NMR hyperfine couplings, T1 anisotropy, and Korringa relations in Rb2CsC60: Search for effects of strong correlation. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:R2967-R2970. [PMID: 9983897 DOI: 10.1103/physrevb.53.r2967] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Slichter CP, Kini AM, Wang HH, Geiser U, Williams JM. 13C NMR studies of the normal and superconducting states of the organic superconductor kappa -(ET)2Cu. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:10364-10368. [PMID: 9980088 DOI: 10.1103/physrevb.52.10364] [Citation(s) in RCA: 102] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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