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Specific heat of CeRhIn5: the pressure-driven transition from antiferromagnetism to heavy-fermion superconductivity

Identifieur interne : 00CB71 ( Main/Repository ); précédent : 00CB70; suivant : 00CB72

Specific heat of CeRhIn5: the pressure-driven transition from antiferromagnetism to heavy-fermion superconductivity

Auteurs : RBID : Pascal:03-0374039

Descripteurs français

Pascal (Inist)
- Chaleur massique, Effet pression, Antiferromagnétisme, Effet champ magnétique, Anomalie, Effet Kondo, Etat singulet, Supraconductivité, Supraconducteur fermion lourd, Alliage base indium, Cérium alliage, Rhodium alliage, Alliage ternaire, Etude expérimentale, Alliage In70Ce17Rh13, Ce In Rh, 7540C, 7425H, 7470T.

English descriptors

KwdEn :
- Anomaly, Antiferromagnetism, Cerium alloys, Experimental study, Heavy fermion superconductors, Indium base alloys, Kondo effect, Magnetic field effects, Pressure effects, Rhodium alloys, Singlet state, Specific heat, Superconductivity, Ternary alloys.

Abstract

CeRhIn₅ has an unusual transition at a critical pressure of ∼ 15 kbar. Specific-heat data show a gradual change in the zero-field 'magnetic' anomaly from one typical of antiferromagnetic (AF) ordering at ambient pressure to one that is more characteristic of a Kondo-singlet ground state at 21 kbar. However, at 15 kbar there is a discontinuous change from an AF ground state to a superconducting ground state, with evidence of a weak thermodynamic first-order transition. For pressures near 12 kbar, there is a pressure-dependent, second-order transition. The low-energy excitations above 15 kbar are characteristic of superconductivity with line nodes in the energy gap, and with extended gapless behaviour at intermediate pressures less than 21 kbar.

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: the pressure-driven transition from antiferromagnetism to heavy-fermion superconductivity</title>
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<seriesStmt><idno type="ISSN">0953-8984</idno>
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<term>Antiferromagnetism</term>
<term>Cerium alloys</term>
<term>Experimental study</term>
<term>Heavy fermion superconductors</term>
<term>Indium base alloys</term>
<term>Kondo effect</term>
<term>Magnetic field effects</term>
<term>Pressure effects</term>
<term>Rhodium alloys</term>
<term>Singlet state</term>
<term>Specific heat</term>
<term>Superconductivity</term>
<term>Ternary alloys</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Chaleur massique</term>
<term>Effet pression</term>
<term>Antiferromagnétisme</term>
<term>Effet champ magnétique</term>
<term>Anomalie</term>
<term>Effet Kondo</term>
<term>Etat singulet</term>
<term>Supraconductivité</term>
<term>Supraconducteur fermion lourd</term>
<term>Alliage base indium</term>
<term>Cérium alliage</term>
<term>Rhodium alliage</term>
<term>Alliage ternaire</term>
<term>Etude expérimentale</term>
<term>Alliage In70Ce17Rh13</term>
<term>Ce In Rh</term>
<term>7540C</term>
<term>7425H</term>
<term>7470T</term>
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<front><div type="abstract" xml:lang="en">CeRhIn<sub>5</sub>
 has an unusual transition at a critical pressure of ∼ 15 kbar. Specific-heat data show a gradual change in the zero-field 'magnetic' anomaly from one typical of antiferromagnetic (AF) ordering at ambient pressure to one that is more characteristic of a Kondo-singlet ground state at 21 kbar. However, at 15 kbar there is a discontinuous change from an AF ground state to a superconducting ground state, with evidence of a weak thermodynamic first-order transition. For pressures near 12 kbar, there is a pressure-dependent, second-order transition. The low-energy excitations above 15 kbar are characteristic of superconductivity with line nodes in the energy gap, and with extended gapless behaviour at intermediate pressures less than 21 kbar.</div>
</front>
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 has an unusual transition at a critical pressure of ∼ 15 kbar. Specific-heat data show a gradual change in the zero-field 'magnetic' anomaly from one typical of antiferromagnetic (AF) ordering at ambient pressure to one that is more characteristic of a Kondo-singlet ground state at 21 kbar. However, at 15 kbar there is a discontinuous change from an AF ground state to a superconducting ground state, with evidence of a weak thermodynamic first-order transition. For pressures near 12 kbar, there is a pressure-dependent, second-order transition. The low-energy excitations above 15 kbar are characteristic of superconductivity with line nodes in the energy gap, and with extended gapless behaviour at intermediate pressures less than 21 kbar.</s0>
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<s4>INC</s4>
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<s2>PAC</s2>
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<fC03 i1="19" i2="3" l="FRE"><s0>7470T</s0>
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Specific heat of CeRhIn5: the pressure-driven transition from antiferromagnetism to heavy-fermion superconductivity

Specific heat of CeRhIn5: the pressure-driven transition from antiferromagnetism to heavy-fermion superconductivity

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Abstract

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