Magnetic and transport properties of single-crystal<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="bold">Ca</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="bold">RuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mo>:</mml:mo></mml:math>Relationship to superconducting<mml:math xmlns:mml="http://www.w3.org/1998/M

Cao, G.; McCall, S.; Shepard, M.; Crow, J. E.; Guertin, R. P.

doi:10.1103/physrevb.56.r2916

Cited by 146 publications

(96 citation statements)

References 12 publications

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“…A common characteristic of these materials is that underlying physical properties are critically linked to the lattice and orbital degrees of freedom and tend to exhibit a giant response to modest lattice changes. This is dramatically illustrated by Sr 2 RuO 4 and Ca 2 RuO 4 , where the former compound exhibits a prototypical p-wave superconducting state [1] that strongly contrasts with the more distorted structure (due to a smaller ionic radius r Ca < r Sr ) and first-order metal-insulator transition, T MI , observed for the latter compound [2,3].…”

Section: Introductionmentioning

confidence: 98%

“…Classic Mott insulators undergo simultaneous transitions to antiferromagnetic (AFM) order and an insulating state at T MI . However, Ca 2 RuO 4 undergoes AFM order at T N = 110 K T MI , [2] and is therefore a highly interesting and unique archetype of a metal-insulator transition that is strongly coupled to a structural transition from a high-T tetragonal to low-T orthorhombic distortion and is not driven by AFM exchange interactions [2,3,6,12].…”

Section: Introductionmentioning

confidence: 99%

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Evolution of magnetism in single-crystalCa2Ru1−xIrx
Yuan
¹
,
Terzic
²
,
Wang
³

et al. 2015
Phys. Rev. B
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3
75
1
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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Evolution of magnetism in single-crystalCa2Ru1−xIrx
Yuan
¹
,
Terzic
²
,
Wang
³

et al. 2015
Phys. Rev. B
Self Cite
49
3
75
1
View full text Add to dashboard Cite

show abstract

“…In addition to magnetite [5,6] we mention Ca 2 RuO 4 [9], and Ti 4 O 7 [5]. The detailed behavior of either of these systems is quite different from that of BaVS 3 , but we believe that there is also a common feature: the soft Coulomb gap due to short-range charge fluctuations.…”

Section: Figmentioning

confidence: 99%

Pressure Induced Quantum Critical Point and Non-Fermi-Liquid Behavior inBaVS3

et al. 2000

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The phase diagram of BaVS3 is studied under pressure using resistivity measurements. The temperature of the metal to nonmagnetic Mott insulator transition decreases under pressure, and vanishes at the quantum critical point pcr = 20kbar. We find two kinds of anomalous conducting states. The high-pressure metallic phase is a non-Fermi liquid described by ∆ρ ∝ T n where n =1.2-1.3 at 1K< T <60K. At p < pcr, the transition is preceded by a wide precursor region with critically increasing resistivity which we ascribe to the opening of a soft Coulomb gap.Understanding the Mott transition, and clarifying the nature of the phases on either side of the transition, is a matter of great importance. Though metal-insulator transitions are often accompanied by an ordering transition and/or influenced by disorder, one may speak about a "pure" Mott transition which is a local correlation effect in an ideal lattice fermion system, and takes place without breaking any global symmetry. Many aspects of this problem can be studied on the multifaceted behavior of BaVS 3 [1-3].The metal-insulator transition of the nearly isotropic 3D compound BaVS 3 offers a realization of the pure Mott transition in nature [3]. Under atmospheric pressure BaVS 3 has three transitions: the hexagonal-toorthorhombic transition at T S = 240K which has only a slight effect on the electrical properties; the metalinsulator transition at T MI = 69K, which does not seem to break any of the symmetries of the metallic phase; and the ordering transition at T X = 30K [4]. In spite of decades of effort, the character of the phases and the driving force of the transitions at T MI and T X , remain mysterious.Here we report the results of single crystal resistivity measurements under hydrostatic pressure in the range of 1bar ≤ p < 25kbar. These pressures encompass the entire insulating phase and part of a high-pressure low-T conducting phase. We report the first observation of the quantum critical point in BaVS 3 , and we characterize the strange metallic phase lying beyond the critical pressure p cr . On the metallic side of the phase boundary, we identify two regimes with anomalous properties: (i) a broad region at p < p cr in which the resistivity increases strongly with decreasing temperature, and (ii) a high-pressure non-Fermi-liquid state.Single crystals of BaVS 3 were grown by Tellurium flux method. The crystals, obtained from the flux by sublimation, have typical dimensions of 3 × 0.5 × 0.5 mm 3 . The resistivity was measured in four probe arrangement. The current was kept low enough to avoid the self-heating of the sample. For the high-pressure measurements the crystal was inserted into a self-clamping cell with kerosene as a pressure medium. The pressure was monitored in-situ by an InSb sensor. During cooling down the cell there was a slight pressure loss, but its influence on the temperature dependence of the resistivity was negligible. Above about 15 kbar the pressure was stable within 0.1 kbar in the whole temperature range.

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“…Although the replacement of Sr by Ca does not change the number of charge carriers, the electronic and magnetic behavior is closely coupled to slight structural changes and varies considerably as a function of the Sr content x. 3,4 Ca 2 RuO 4 is a Mott insulator and is antiferromagnetically ordered below 110 K, 5,6 while for x > 0.18, the ground state is metallic. The strongly enhanced values of the magnetic susceptibility indicate that the system is close to a ferromagnetic instability at approximately x = 0.5.…”

Section: Introductionmentioning

confidence: 99%

Magnetic excitations in the metallic single-layer ruthenates Ca2−xSrxRuO
Steffens
¹
,
Friedt
²
,
Sidis
³

et al. 2011
Phys. Rev. B

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By inelastic neutron scattering, we have analyzed the magnetic correlations in the paramagnetic metallic region of the series Ca 2−x Sr x RuO 4 , 0.2 x 0.62. We find different contributions that correspond to twodimensional ferromagnetic fluctuations and to fluctuations at incommensurate wave vectors Q IC 1 = (0.11,0,0), Q IC 2 = (0.26,0,0), and Q IC αβ = (0.3,0.3,0). These components constitute the measured response as a function of the Sr concentration x, of the magnetic field, and of the temperature. A generic model is applicable to metallic Ca 2−x Sr x RuO 4 close to the Mott transition, in spite of their strongly varying physical properties. The amplitude, characteristic energy, and width of the incommensurate components vary only slightly as functions of x, but the ferromagnetic component depends sensitively on concentration, temperature, and magnetic field. While ferromagnetic fluctuations are very strong in Ca 1.38 Sr 0.62 RuO 4 with a low characteristic energy of 0.2 meV at T = 1.5 K, they are strongly suppressed in Ca 1.8 Sr 0.2 RuO 4 , but reappear upon the application of a magnetic field, and form a magnon mode above the metamagnetic transition. The inelastic neutron scattering results document how the competition between ferromagnetic and incommensurate antiferromagnetic instabilities governs the physics of this system.

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Magnetic and transport properties of single-crystalCa2RuO4:Relationship to superconducting
G. Cao
¹
,
S. McCall
²
,
M. Shepard
³

et al.

Cited by 146 publications

References 12 publications

Evolution of magnetism in single-crystalCa2Ru1−xIrx
Yuan
¹
,
Terzic
²
,
Wang
³

et al. 2015
Phys. Rev. B
Self Cite
49
3
75
1
View full text Add to dashboard Cite

Evolution of magnetism in single-crystalCa2Ru1−xIrx
Yuan
¹
,
Terzic
²
,
Wang
³

et al. 2015
Phys. Rev. B
Self Cite
49
3
75
1
View full text Add to dashboard Cite

Pressure Induced Quantum Critical Point and Non-Fermi-Liquid Behavior inBaVS3

Magnetic excitations in the metallic single-layer ruthenates Ca2−xSrxRuO
Steffens
¹
,
Friedt
²
,
Sidis
³

et al. 2011
Phys. Rev. B

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Magnetic and transport properties of single-crystalCa2RuO4:Relationship to superconductingG. Cao1, S. McCall2, M. Shepard3 et al.

Cited by 146 publications

References 12 publications

Evolution of magnetism in single-crystalCa2Ru1−xIrxYuan1, Terzic2, Wang3 et al. 2015Phys. Rev. BSelf Cite493751View full textAdd to dashboardCite

Evolution of magnetism in single-crystalCa2Ru1−xIrxYuan1, Terzic2, Wang3 et al. 2015Phys. Rev. BSelf Cite493751View full textAdd to dashboardCite

Pressure Induced Quantum Critical Point and Non-Fermi-Liquid Behavior inBaVS3

Magnetic excitations in the metallic single-layer ruthenates Ca2−xSrxRuOSteffens1, Friedt2, Sidis3 et al. 2011Phys. Rev. B

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Magnetic and transport properties of single-crystalCa2RuO4:Relationship to superconducting
G. Cao
¹
,
S. McCall
²
,
M. Shepard
³

et al.

Evolution of magnetism in single-crystalCa2Ru1−xIrx
Yuan
¹
,
Terzic
²
,
Wang
³

et al. 2015
Phys. Rev. B
Self Cite
49
3
75
1
View full text Add to dashboard Cite

Evolution of magnetism in single-crystalCa2Ru1−xIrx
Yuan
¹
,
Terzic
²
,
Wang
³

et al. 2015
Phys. Rev. B
Self Cite
49
3
75
1
View full text Add to dashboard Cite

Magnetic excitations in the metallic single-layer ruthenates Ca2−xSrxRuO
Steffens
¹
,
Friedt
²
,
Sidis
³

et al. 2011
Phys. Rev. B