Publisher's Note: Attojoule Calorimetry of Mesoscopic Superconducting Loops [Phys. Rev. Lett.<b>94</b>, 057007 (2005)]

Bourgeois, Olivier; Skipetrov, S. E.; Ong, Florian; Chaussy, J.

doi:10.1103/physrevlett.94.069904

Cited by 40 publications

(87 citation statements)

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“…Indeed, even attojoule calorimetry has been achieved in electronic systems, although by using multiple samples. 22 Our rigorous results are clearly larger than estimates made 16 for dirty systems. These estimates, based on partial consideration of the Josephson energy only, are in the nature of lower bounds.…”

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confidence: 53%

“…Translating these results for the normalized measure of the latent heat into actual units for typical samples 7 , we find that they are of order of up to 10 10 k B T or 10 −13 J. Standard ac calorimetry techniques offer a resolution 22,23 at least one order of magnitude smaller. Indeed, even attojoule calorimetry has been achieved in electronic systems, although by using multiple samples.…”

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confidence: 89%

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First-order phase transitions in ferromagnet/superconductor layered structures

2006

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We study the thermodynamics of clean structures composed of superconductor (S) and ferromagnet (F) layers and consisting of one or more SFS junctions. We use fully self consistent numerical methods to compute the condensation free energies of the possible order parameter configurations as a function of temperature T . As T varies, we find that there are phase transitions between states characterized by different junction configurations (denoted as "0" or "π" according to the phase difference of the order parameter in consecutive S layers). We show that these transitions are of first order. We calculate the associated latent heats and find them to be measurable. PACS numbers: 74.45.+c, 74.25.Bt, 74.78.Fk A plethora of new ideas and devices has been emerging from the study of nanostructures as they pertain to the field of spintronics1 . An important part of this development has occurred through the study of the rich and varied phenomena that occur 2 in heterostructures involving superconductors (S) and ferromagnets (F).The physics of such F/S heterostructures is dominated by the proximity effects that arise from the competition between superconducting and magnetic orderings in the materials comprising the structure, with each of the corresponding order parameters penetrating into the other material. These effects follow from normal and Andreev 3 reflection processes at the interfaces. In the latter process, an electron encounters one of the interfaces, is converted into a hole with opposite spin and traverses in the opposite direction. For S/N interfaces (where N is a non-magnetic, non-superconducting metal) the dynamics of charge transport is degenerate with respect to the electron spin quantum variable. This is not true, however, in the case we consider here, where superconducting regions are separated by magnetic interlayers.In SFS trilayers, as well as in multilayers built from a sequence of such structures (SFSFS. . . ), the spinsplitting effect of the magnet produces important and nontrivial changes in Andreev and other scattering processes. The exchange field in the ferromagnet breaks the time-reversal symmetry and generates a superconducting state where the Cooper pairs acquire a finite momentum resulting in a spatial modulation of the superconducting pair amplitude in the F region 4 . Depending on the geometric and material characteristics of the SFS trilayer, its thermodynamic equilibrium state can be a "0" or a "π" state, depending on the value of the phase difference between the superconducting order parameters in the two S electrodes. It is this twofold possibility that lies at the foundation of the many spin-based switching phenomena, which in turn are the basis for devices, including superconducting π qubits 5 and memory elements 6 . For larger SFSFS. . . S type heterostructures the order parameter may or may not flip between any pair of consecutive S layers, leading to a variety of possible configurations, which can be characterized as a sequence of 0 and π junctions.Continual advances in nanopr...

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confidence: 53%

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confidence: 89%

First-order phase transitions in ferromagnet/superconductor layered structures

2006

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“…The setup is cooled down to very low temperatures using a dilution fridge, equipped with a superconducting coil supplying a magnetic field H normal to the plane of the rings. As compared to previous measurements [21][22][23], the thermometry has been adapted to work at very low temperature and the arm width has been increased from 40 µm to 150 µm to allow measurements at a higher frequency. Consequently, δT dc = T membrane − T cryostat decreased and we were able to obtain temperatures compatible with the purpose of our study (T 70 mK on the membrane for a regulated temperature of 50 mK of the sample holder) [29].…”

Section: Methodsmentioning

confidence: 99%

“…between the membrane and the heat bath (for more details see [21,26,27,29]). The setup is cooled down to very low temperatures using a dilution fridge, equipped with a superconducting coil supplying a magnetic field H normal to the plane of the rings.…”

Section: Methodsmentioning

confidence: 99%

“…Equation (2) shows that the dependence of C on Φ is intimately related to the dependence of I on T . This link between C and I was already exploited by Yang and Zhou to investigate the impact of spin-orbit coupling on both the persistent current and the heat capacity in the model of noninteracting electrons [20], as well as by (some of the) present authors to study the entrance of magnetic vortices into superconducting loops [21][22][23]. The experiments reported here are, however, much more involved than those performed in the superconducting state: not only we work at much lower temperatures (T ∼ 100 mK instead of T ∼ 1 K), but also the variations of the heat capacity to detect are much weaker (∆C ∼ k B instead of ∆C ∼ 10 3 k B ).…”

Section: Introductionmentioning

confidence: 99%

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Searching for thermal signatures of persistent currents in normal-metal rings

Souche¹,

Huillery²,

Pothier³

et al. 2013

Phys. Rev. B

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We introduce a calorimetric approach to probe persistent currents in normal metal rings. The heat capacity of a large ensemble of silver rings is measured by nanocalorimetry under a varying magnetic field at different temperatures (60 mK, 100 mK and 150 mK). Periodic oscillations versus magnetic field are detected in the phase signal of the temperature oscillations, though not in the amplitude (both of them directly linked to the heat capacity). The period of these oscillations (Φ0/2, with Φ0 = h/e the magnetic flux quantum) and their evolution with temperature are in agreement with theoretical predictions. In contrast, the amplitude of the corresponding heat capacity oscillations (several kB) is two orders of magnitude larger than predicted by theory.

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Very Sensitive Nanocalorimetry of Small Mass Systems and Glassy Materials

Garden

Tavakoli

Nguyen-Duc

et al. 2016

Nanomaterials for Security

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International audienceNanocalorimetry is a technique that deals with any thermal measurement methods in which either the samples to be studied have a size in the range of the nanometer scale or the measured energies involved are of the order of the nanojoule or below [1]. In this paper, we show the results of two nanocalorimetric experiments. The first one is related to the measurement of specific heat on ultra-thin small systems (thin films) at low temperature. It is shown that such measurement can be sensitive to less than one monolayer of materials. The second one illustrates the efficiency of calorimetric studies sensitive at the nanoJoule on complex system (polymeric glass) at room temperature. We then discuss the potentiality of these experimental methods in the field of security: the measurement of either a very small mass or very small quantity of energy for the detection of tiny thermal events

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Publisher's Note: Attojoule Calorimetry of Mesoscopic Superconducting Loops [Phys. Rev. Lett.94, 057007 (2005)]

Cited by 40 publications

References 0 publications

First-order phase transitions in ferromagnet/superconductor layered structures

First-order phase transitions in ferromagnet/superconductor layered structures

Searching for thermal signatures of persistent currents in normal-metal rings

Very Sensitive Nanocalorimetry of Small Mass Systems and Glassy Materials

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