R. Movshovich
Los Alamos National Laboratory
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Featured researches published by R. Movshovich.
EPL | 2001
C. Petrovic; R. Movshovich; M. Jaime; P. G. Pagliuso; M. F. Hundley; J. L. Sarrao; Z. Fisk; J. D. Thompson
CeIrIn5 is a member of a new family of heavy-fermion compounds and has a Sommerfeld specific-heat coefficient of 720 mJ/molK2. It exhibits a bulk, thermodynamic transition to a superconducting state at Tc = 0.40 K, below which the specific heat decreases as T2 to a small residual T-linear value. Surprisingly, the electrical resistivity drops below instrumental resolution at a much higher temperature T0 = 1.2 K. These behaviors are highly reproducible and field-dependent studies indicate that T0 and Tc arise from the same underlying electronic structure. The layered crystal structure of CeIrIn5 suggests a possible analogy to the cuprates in which spin/charge pair correlations develop well above Tc.
Physical Review Letters | 2001
R. Movshovich; M. Jaime; J. D. Thompson; C. Petrovic; Z. Fisk; P. G. Pagliuso; J. L. Sarrao
Low temperature specific heat and thermal conductivity measurements on the ambient pressure heavy fermion superconductors CeIrIn5 and CeCoIn5 reveal power law temperature dependences of these quantities below T(c). The low temperature specific heat in both CeIrIn5 and CeCoIn5 includes T2 terms, consistent with the presence of nodes in the superconducting energy gap. The thermal conductivity data present a T-linear term consistent with the universal limit (CeIrIn5), and a low temperature T3 variation in the clean limit (CeCoIn5), also in accord with prediction for an unconventional superconductor with lines of nodes.
Physical Review Letters | 2003
A. Bianchi; R. Movshovich; C. Capan; P. G. Pagliuso; J. L. Sarrao
We report specific heat measurements of the heavy fermion superconductor CeCoIn5 in the vicinity of the superconducting critical field H(c2), with magnetic fields in the [110], [100], and [001] directions, and at temperatures down to 50 mK. The superconducting phase transition changes from second to first order for fields above 10 T for H parallel [110] and H parallel [100]. In the same range of magnetic fields, we observe a second specific heat anomaly within the superconducting state. We interpret this anomaly as a signature of a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) inhomogeneous superconducting state. We obtain similar results for H parallel [001], with the FFLO state occupying a smaller part of the phase diagram.
Nature | 2006
Tuson Park; F. Ronning; H. Q. Yuan; M. B. Salamon; R. Movshovich; John L. Sarrao; J. D. Thompson
With only a few exceptions that are well understood, conventional superconductivity does not coexist with long-range magnetic order (for example, ref. 1). Unconventional superconductivity, on the other hand, develops near a phase boundary separating magnetically ordered and magnetically disordered phases. A maximum in the superconducting transition temperature Tc develops where this boundary extrapolates to zero Kelvin, suggesting that fluctuations associated with this magnetic quantum-critical point are essential for unconventional superconductivity. Invariably, though, unconventional superconductivity masks the magnetic phase boundary when T < Tc, preventing proof of a magnetic quantum-critical point. Here we report specific-heat measurements of the pressure-tuned unconventional superconductor CeRhIn5 in which we find a line of quantum–phase transitions induced inside the superconducting state by an applied magnetic field. This quantum-critical line separates a phase of coexisting antiferromagnetism and superconductivity from a purely unconventional superconducting phase, and terminates at a quantum tetracritical point where the magnetic field completely suppresses superconductivity. The T → 0 K magnetic field–pressure phase diagram of CeRhIn5 is well described with a theoretical model developed to explain field-induced magnetism in the high-Tc copper oxides, but in which a clear delineation of quantum–phase boundaries has not been possible. These experiments establish a common relationship among hidden magnetism, quantum criticality and unconventional superconductivity in copper oxides and heavy-electron systems such as CeRhIn5.
Science | 2008
M. Kenzelmann; Th. Strässle; Ch. Niedermayer; Manfred Sigrist; B. Padmanabhan; M. Zolliker; A. D. Bianchi; R. Movshovich; Eric D. Bauer; J.L. Sarrao; Joe D. Thompson
Strong magnetic fluctuations can provide a coupling mechanism for electrons that leads to unconventional superconductivity. Magnetic order and superconductivity have been found to coexist in a number of magnetically mediated superconductors, but these order parameters generally compete. We report that close to the upper critical field, CeCoIn5 adopts a multicomponent ground state that simultaneously carries cooperating magnetic and superconducting orders. Suppressing superconductivity in a first-order transition at the upper critical field leads to the simultaneous collapse of the magnetic order, showing that superconductivity is necessary for the magnetic order. A symmetry analysis of the coupling between the magnetic order and the superconducting gap function suggests a form of superconductivity that is associated with a nonvanishing momentum.
Physical Review Letters | 2003
Andrea Bianchi; R. Movshovich; I. Vekhter; P. G. Pagliuso; J. L. Sarrao
We measured the specific heat and resistivity of heavy fermion CeCoIn5 between the superconducting critical field H(c2)=5 T and 9 T, with the field in the [001] direction, and at temperatures down to 50 mK. At 5 T the data show a non-Fermi liquid (NFL) behavior down to the lowest temperatures. At the field above 8 T the data exhibit a crossover from the Fermi liquid to a non-Fermi liquid behavior. We analyzed the scaling properties of the specific heat and compared both the resistivity and the specific heat with the predictions of a spin-fluctuation theory. Our analysis leads us to suggest that the NFL behavior is due to incipient antiferromagnetism (AFM) in CeCoIn5 with the quantum critical point in the vicinity of H(c2). Below H(c2) the AFM phase which competes with the paramagnetic ground state is superseded by the superconducting transition.
Physical Review Letters | 2002
Andrea Bianchi; R. Movshovich; N. Oeschler; P. Gegenwart; F. Steglich; Joe D. Thompson; P. G. Pagliuso; J.L. Sarrao
The superconducting phase transition in heavy fermion CeCoIn5 (T(c)=2.3 K in zero field) becomes first order when the magnetic field H parallel [001] is greater than 4.7 T, and the transition temperature is below T0 approximately 0.31T(c). The change from second order at lower fields is reflected in strong sharpening of both specific heat and thermal expansion anomalies associated with the phase transition, a strong magnetocaloric effect, and a steplike change in the sample volume. This effect is due to Pauli limiting in a type-II superconductor, and was predicted theoretically in the mid-1960s.
Physical Review B | 2001
P. G. Pagliuso; C. Petrovic; R. Movshovich; Donavan Hall; M. F. Hundley; J. L. Sarrao; J. D. Thompson; Z. Fisk
We report a thermodynamic and transport study of the phase diagram of
Journal of Magnetism and Magnetic Materials | 2001
Joe D. Thompson; R. Movshovich; Z. Fisk; F. Bouquet; N. J. Curro; R.A. Fisher; P. C. Hammel; H Hegger; M. F. Hundley; Marcelo Jaime; P.G Pagliuso; C Petrovic; Norman E. Phillips; John L. Sarrao
{\mathrm{CeRh}}_{1\ensuremath{-}x}{\mathrm{Ir}}_{x}{\mathrm{In}}_{5}.
Physica C-superconductivity and Its Applications | 1994
R. Movshovich; M. F. Hundley; Joe D. Thompson; P. C. Canfield; B. K. Cho; A.V. Chubukov
Bulk superconductivity is observed over a broad range of doping,