1
|
Jung S, Jang H, Kim J, Park J, Lee S, Seo S, Bauer ED, Park T. A Quenched Disorder in the Quantum-Critical Superconductor CeCoIn 5. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2304837. [PMID: 37985882 PMCID: PMC10767398 DOI: 10.1002/advs.202304837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 10/20/2023] [Indexed: 11/22/2023]
Abstract
Emergent inhomogeneous electronic phases in metallic quantum systems are crucial for understanding high-Tc superconductivity and other novel quantum states. In particular, spin droplets introduced by nonmagnetic dopants in quantum-critical superconductors (QCSs) can lead to a novel magnetic state in superconducting phases. However, the role of disorders caused by nonmagnetic dopants in quantum-critical regimes and their precise relation with superconductivity remain unclear. Here, the systematic evolution of a strong correlation between superconductive intertwined electronic phases and antiferromagnetism in Cd-doped CeCoIn5 is presented by measuring current-voltage characteristics under an external pressure. In the low-pressure coexisting regime where antiferromagnetic (AFM) and superconducting (SC) orders coexist, the critical current (Ic ) is gradually suppressed by the increasing magnetic field, as in conventional type-II superconductors. At pressures higher than the critical pressure where the AFM order disappears, Ic remarkably shows a sudden spike near the irreversible magnetic field. In addition, at high pressures far from the critical pressure point, the peak effect is not suppressed, but remains robust over the whole superconducting region. These results indicate that magnetic islands are protected around dopant sites despite being suppressed by the increasingly correlated effects under pressure, providing a new perspective on the role of quenched disorders in QCSs.
Collapse
Affiliation(s)
- Soon‐Gil Jung
- Department of Physics EducationSunchon National UniversitySuncheon57922South Korea
| | - Harim Jang
- Department of PhysicsSungkyunkwan UniversitySuwon16419South Korea
| | - Jihyun Kim
- Department of PhysicsSungkyunkwan UniversitySuwon16419South Korea
| | - Jin‐Hong Park
- Department of PhysicsSungkyunkwan UniversitySuwon16419South Korea
| | - Sangyun Lee
- Los Alamos National LaboratoryAlamosNM87545USA
| | - Soonbeom Seo
- Department of PhysicsChangwon National UniversityChangwon51140South Korea
| | | | - Tuson Park
- Center for Quantum Materials and Superconductivity (CQMS)Department of PhysicsSungkyunkwan UniversitySuwon16419South Korea
| |
Collapse
|
2
|
Parameswaran SA, Gopalakrishnan S. Asymptotically Exact Theory for Nonlinear Spectroscopy of Random Quantum Magnets. PHYSICAL REVIEW LETTERS 2020; 125:237601. [PMID: 33337218 DOI: 10.1103/physrevlett.125.237601] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Accepted: 10/21/2020] [Indexed: 06/12/2023]
Abstract
We study nonlinear response in quantum spin systems near infinite-randomness critical points. Nonlinear dynamical probes, such as two-dimensional (2D) coherent spectroscopy, can diagnose the nearly localized character of excitations in such systems. We present exact results for nonlinear response in the 1D random transverse-field Ising model, from which we extract information about critical behavior that is absent in linear response. Our analysis yields exact scaling forms for the distribution functions of relaxation times that result from realistic channels for dissipation in random magnets. We argue that our results capture the scaling of relaxation times and nonlinear response in generic random quantum magnets in any spatial dimension.
Collapse
Affiliation(s)
- S A Parameswaran
- Rudolf Peierls Center for Theoretical Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom
| | - S Gopalakrishnan
- Department of Physics and Astronomy, CUNY College of Staten Island, Staten Island, New York 10314, USA
- Physics Program and Initiative for the Theoretical Sciences, The Graduate Center, CUNY, New York, New York 10016, USA
| |
Collapse
|
3
|
Chen Y, Jiang WB, Guo CY, Ronning F, Bauer ED, Park T, Yuan HQ, Fisk Z, Thompson JD, Lu X. Reemergent superconductivity and avoided quantum criticality in Cd-doped CeIrIn(5) under pressure. PHYSICAL REVIEW LETTERS 2015; 114:146403. [PMID: 25910144 DOI: 10.1103/physrevlett.114.146403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Indexed: 06/04/2023]
Abstract
We investigated the electrical resistivity and heat capacity of 1% Cd-doped CeIrIn_{5} under hydrostatic pressure up to 2.7 GPa, near where long-range antiferromagnetic order is suppressed and bulk superconductivity suddenly reemerges. The pressure-induced T_{c} is close to that of pristine CeIrIn_{5} at 2.7 GPa, and no signatures of a quantum critical point under pressure support a local origin of the antiferromagnetic moments in Cd-CeIrIn_{5} at ambient pressure. Similarities between superconductors CeIrIn_{5} and CeCoIn_{5} in response to Cd substitutions suggest a common magnetic mechanism.
Collapse
Affiliation(s)
- Y Chen
- Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, China
| | - W B Jiang
- Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, China
| | - C Y Guo
- Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, China
| | - F Ronning
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - E D Bauer
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Tuson Park
- Department of Physics, Sungkyunkwan University, Suwon 440-746, South Korea
| | - H Q Yuan
- Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
| | - Z Fisk
- Department of Physics, University of California, Irvine, California 92697, USA
| | - J D Thompson
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Xin Lu
- Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
| |
Collapse
|
4
|
Vojta T. Strong-disorder magnetic quantum phase transitions: Status and new developments. ACTA ACUST UNITED AC 2014. [DOI: 10.1088/1742-6596/529/1/012016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
5
|
Hu R, Wang K, Ryu H, Lei H, Choi ES, Uhlarz M, Wosnitza J, Petrovic C. Electronic Griffiths phase in the Te-doped semiconductor FeSb2. PHYSICAL REVIEW LETTERS 2012; 109:256401. [PMID: 23368482 DOI: 10.1103/physrevlett.109.256401] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2012] [Indexed: 06/01/2023]
Abstract
We report on the emergence of an electronic Griffiths phase in the doped semiconductor FeSb(2), predicted for disordered insulators with random localized moments in the vicinity of a metal-insulator transition. Magnetic, transport, and thermodynamic measurements of Fe(Sb(1-x)Te(x))(2) single crystals show signatures of disorder-induced non-Fermi liquid behavior and a Wilson ratio expected for strong electronic correlations. The electronic Griffiths phase states are found on the metallic boundary between the insulating state (x = 0) and a long-range albeit weak magnetic order (x ≥ 0.075).
Collapse
Affiliation(s)
- Rongwei Hu
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
| | | | | | | | | | | | | | | |
Collapse
|
6
|
Demkó L, Bordács S, Vojta T, Nozadze D, Hrahsheh F, Svoboda C, Dóra B, Yamada H, Kawasaki M, Tokura Y, Kézsmárki I. Disorder promotes ferromagnetism: rounding of the quantum phase transition in Sr(1-x)Ca(x)RuO3. PHYSICAL REVIEW LETTERS 2012; 108:185701. [PMID: 22681090 DOI: 10.1103/physrevlett.108.185701] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2011] [Indexed: 06/01/2023]
Abstract
The subtle interplay of randomness and quantum fluctuations at low temperatures gives rise to a plethora of unconventional phenomena in systems ranging from quantum magnets and correlated electron materials to ultracold atomic gases. Particularly strong disorder effects have been predicted to occur at zero-temperature quantum phase transitions. Here, we demonstrate that the composition-driven ferromagnetic-to-paramagnetic quantum phase transition in Sr(1-x)Ca(x)RuO3 is completely destroyed by the disorder introduced via the different ionic radii of the randomly distributed Sr and Ca ions. Using a magneto-optical technique, we map the magnetic phase diagram in the composition-temperature space. We find that the ferromagnetic phase is significantly extended by the disorder and develops a pronounced tail over a broad range of the composition x. These findings are explained by a microscopic model of smeared quantum phase transitions in itinerant magnets. Moreover, our theoretical study implies that correlated disorder is even more powerful in promoting ferromagnetism than random disorder.
Collapse
Affiliation(s)
- L Demkó
- Department of Physics, Budapest University of Technology and Economics and Condensed Matter Research Group of the Hungarian Academy of Sciences, 1111 Budapest, Hungary
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
7
|
Vojta T, Hoyos JA, Mohan P, Narayanan R. Influence of super-ohmic dissipation on a disordered quantum critical point. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:094206. [PMID: 21339559 DOI: 10.1088/0953-8984/23/9/094206] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We investigate the combined influence of quenched randomness and dissipation on a quantum critical point with O(N) order-parameter symmetry. Utilizing a strong-disorder renormalization group, we determine the critical behavior in one space dimension exactly. For super-ohmic dissipation, we find a Kosterlitz-Thouless type transition with conventional (power-law) dynamical scaling. The dynamical critical exponent depends on the spectral density of the dissipative baths. We also discuss the Griffiths singularities, and we determine observables.
Collapse
Affiliation(s)
- Thomas Vojta
- Department of Physics, Missouri University of Science and Technology, Rolla, MO 65409, USA
| | | | | | | |
Collapse
|
8
|
Klosek V, Griveau JC, Faure P, Genestier C, Baclet N, Wastin F. High pressure study of Pu(0.92)Am(0.08) binary alloy. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2008; 20:275217. [PMID: 21694378 DOI: 10.1088/0953-8984/20/27/275217] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The phase transitions (by means of x-ray diffraction) and electrical resistivity of a Pu(0.92)Am(0.08) binary alloy were determined under pressure (up to 2 GPa). The evolution of atomic volume with pressure gives detailed information concerning the degree of localization of 5f electronic states and their delocalization process. A quasi-linear V = f(P) dependence reflects subtle modifications of the electronic structure when P increases. The electrical resistivity measurements reveal the very high stability of the δ phase for pressures less than 0.7 GPa, since no martensitic-like transformation occurs at low temperature. Remarkable electronic behaviours have also been observed. Finally, resistivity curves have shown the temperature dependence of the phase transformations together with unexpected kinetic effects.
Collapse
Affiliation(s)
- V Klosek
- CEA, Valduc, F-21120 Is-sur-Tille, France
| | | | | | | | | | | |
Collapse
|
9
|
Hoyos JA, Kotabage C, Vojta T. Effects of dissipation on a quantum critical point with disorder. PHYSICAL REVIEW LETTERS 2007; 99:230601. [PMID: 18233349 DOI: 10.1103/physrevlett.99.230601] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2007] [Indexed: 05/25/2023]
Abstract
We study the effects of dissipation on a disordered quantum phase transition with O(N) order-parameter symmetry by applying a strong-disorder renormalization group to the Landau-Ginzburg-Wilson field theory of the problem. We find that Ohmic dissipation results in a nonperturbative infinite-randomness critical point with unconventional activated dynamical scaling while super-Ohmic damping leads to conventional behavior. We discuss applications to the superconductor-metal transition in nanowires and to the Hertz theory of the itinerant antiferromagnetic transition.
Collapse
Affiliation(s)
- José A Hoyos
- Department of Physics, University of Missouri-Rolla, Rolla, Missouri 65409, USA
| | | | | |
Collapse
|
10
|
Urbano RR, Young BL, Curro NJ, Thompson JD, Pham LD, Fisk Z. Interacting antiferromagnetic droplets in quantum critical CeCoIn5. PHYSICAL REVIEW LETTERS 2007; 99:146402. [PMID: 17930691 DOI: 10.1103/physrevlett.99.146402] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2007] [Indexed: 05/25/2023]
Abstract
The heavy fermion superconductor CeCoIn5 can be tuned between superconducting and antiferromagnetic ground states by hole doping with Cd. Nuclear magnetic resonance data indicate that these two orders coexist microscopically with an ordered moment approximately 0.7 microB. As the ground state evolves, there is no change in the low-frequency spin dynamics in the disordered state. These results suggest that the magnetism emerges locally in the vicinity of the Cd dopants.
Collapse
Affiliation(s)
- R R Urbano
- Condensed Matter and Thermal Physics, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | | | | | | | | | | |
Collapse
|
11
|
Parolin TJ, Salman Z, Chakhalian J, Song Q, Chow KH, Hossain MD, Keeler TA, Kiefl RF, Kreitzman SR, Levy CDP, Miller RI, Morris GD, Pearson MR, Saadaoui H, Wang D, MacFarlane WA. beta-NMR of isolated lithium in nearly ferromagnetic palladium. PHYSICAL REVIEW LETTERS 2007; 98:047601. [PMID: 17358812 DOI: 10.1103/physrevlett.98.047601] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2006] [Indexed: 05/14/2023]
Abstract
The temperature dependence of the frequency shift and spin-lattice relaxation rate of isolated, nonmagnetic (8)Li impurities implanted in a nearly ferromagnetic host (Pd) are measured by means of beta-detected nuclear magnetic resonance (beta-NMR). The shift is negative, very large, and increases monotonically with decreasing T in proportion to the bulk susceptibility of Pd for T > T* approximately 100 K. Below T*, an additional shift occurs which we attribute to the response of Pd to the defect. The relaxation rate is much slower than expected for the large shift and is linear with T below T*, showing no sign of additional relaxation mechanisms associated with the defect.
Collapse
Affiliation(s)
- T J Parolin
- Department of Chemistry, University of British Columbia, Vancouver, BC, V6T 1Z1, Canada
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
12
|
Schehr G, Rieger H. Strong-disorder fixed point in the dissipative random transverse-field Ising model. PHYSICAL REVIEW LETTERS 2006; 96:227201. [PMID: 16803340 DOI: 10.1103/physrevlett.96.227201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2005] [Indexed: 05/10/2023]
Abstract
The interplay between disorder, quantum fluctuations, and dissipation is studied in the random transverse Ising chain coupled to a dissipative Ohmic bath with a real space renormalization group. A typically very large length scale L* is identified above which the physics of frozen clusters dominates. Below L* a strong-disorder fixed point determines scaling at a pseudocritical point. In a Griffiths-McCoy region frozen clusters produce already a finite magnetization resulting in a classical low temperature behavior of the susceptibility and specific heat. These override the confluent singularities that are characterized by a continuously varying exponent z and are visible above a temperature T*approximately L*-z.
Collapse
Affiliation(s)
- Grégory Schehr
- Theoretische Physik, Universität des Saarlandes, 66041 Saarbrücken, Germany
| | | |
Collapse
|
13
|
Vojta T. Rare region effects at classical, quantum and nonequilibrium phase transitions. ACTA ACUST UNITED AC 2006. [DOI: 10.1088/0305-4470/39/22/r01] [Citation(s) in RCA: 316] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
14
|
Maebashi H, Miyake K, Varma CM. Undressing the Kondo effect near the antiferromagnetic quantum critical point. PHYSICAL REVIEW LETTERS 2005; 95:207207. [PMID: 16384097 DOI: 10.1103/physrevlett.95.207207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2005] [Indexed: 05/05/2023]
Abstract
The problem of a spin-1/2 magnetic impurity near an antiferromagnetic transition of the host lattice is shown to transform to a multichannel problem. A variety of fixed points is discovered asymptotically near the antiferromagnetic critical point. Among these is a new variety of stable fixed point of a multichannel Kondo problem which does not require channel isotropy. At this point Kondo screening disappears but coupling to spin fluctuations remains. In addition to its intrinsic interest, the problem is an essential ingredient in the problem of quantum critical points in heavy fermions.
Collapse
Affiliation(s)
- H Maebashi
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | | | | |
Collapse
|
15
|
Dobrosavljević V, Miranda E. Absence of conventional quantum phase transitions in itinerant systems with disorder. PHYSICAL REVIEW LETTERS 2005; 94:187203. [PMID: 15904407 DOI: 10.1103/physrevlett.94.187203] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2004] [Indexed: 05/02/2023]
Abstract
Effects of disorder are examined in itinerant systems close to quantum critical points. We argue that spin fluctuations due to the long-range part of the RKKY interactions generically induce non-Ohmic dissipation due to rare disorder configurations. This dissipative mechanism is found to destabilize quantum Griffiths phase behavior in itinerant systems with arbitrary symmetry of the order parameter, leading to the formation of a "cluster glass" phase preceding uniform ordering.
Collapse
Affiliation(s)
- V Dobrosavljević
- Department of Physics and National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32306, USA
| | | |
Collapse
|
16
|
Shah N, Millis AJ. Dissipative dynamics of an extended magnetic nanostructure: spin necklace in a metallic environment. PHYSICAL REVIEW LETTERS 2003; 91:147204. [PMID: 14611552 DOI: 10.1103/physrevlett.91.147204] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2003] [Indexed: 05/24/2023]
Abstract
We study theoretically the dynamics of an "xxz" spin necklace coupled to a conduction electron sea, a model system for a nanostructure in a dissipative environment. We extract the long-time behavior via a mapping to a multichannel Coulomb gas problem followed by a scaling analysis. The strong quantum fluctuations of the necklace cause a nontrivial dependence of couplings on system size which we extract via an analysis involving the "boundary condition changing operator," and confirm via a detailed numerical evaluation of one case.
Collapse
Affiliation(s)
- N Shah
- Center for Materials Theory, Department of Physics & Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway, New Jersey 08854, USA
| | | |
Collapse
|
17
|
Vojta T. Disorder-induced rounding of certain quantum phase transitions. PHYSICAL REVIEW LETTERS 2003; 90:107202. [PMID: 12689028 DOI: 10.1103/physrevlett.90.107202] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2002] [Indexed: 05/24/2023]
Abstract
We study the influence of quenched disorder on quantum phase transitions in systems with overdamped dynamics. For Ising order-parameter symmetry disorder destroys the sharp phase transition by rounding because a static order parameter can develop on rare spatial regions. This leads to an exponential dependence of the order parameter on the coupling constant. At finite temperatures the static order on the rare regions is destroyed. This restores the phase transition and leads to a double-exponential relation between critical temperature and coupling strength. We discuss the behavior based on Lifshitz-tail arguments and illustrate the results by simulations of a model system.
Collapse
Affiliation(s)
- Thomas Vojta
- Department of Physics, University of Missouri-Rolla, Rolla, Missouri 65409, USA
| |
Collapse
|
18
|
Maebashi H, Miyake K, Varma CM. Singular effects of impurities near the ferromagnetic quantum-critical point. PHYSICAL REVIEW LETTERS 2002; 88:226403. [PMID: 12059438 DOI: 10.1103/physrevlett.88.226403] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2001] [Indexed: 05/23/2023]
Abstract
Systematic theoretical results for the effects of a dilute concentration of magnetic impurities on the thermodynamic and transport properties in the region around the quantum critical point of a ferromagnetic transition are obtained. In the quasiclassical regime, the dynamical spin fluctuations enhance the Kondo temperature. This energy scale decreases rapidly in the quantum fluctuation regime, where the properties are those of a line of critical points of the multichannel Kondo problem with the number of channels increasing as the critical point is approached, except at unattainably low temperatures where a single channel wins out.
Collapse
Affiliation(s)
- H Maebashi
- Department of Physical Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | | | | |
Collapse
|