P. Haen - Academia.edu (original) (raw)

Papers by P. Haen

Research paper thumbnail of The magnetovolume properties of Y(Co1-xAlx)2 compounds

Research paper thumbnail of Low temperature properties of Ce(Pd 1- x Ag x )

European Physical Journal B - EUR PHYS J B, 1996

Low temperature magnetic, transport and thermal measurements on the Ce(Pd1-x Agx) system, with x ... more Low temperature magnetic, transport and thermal measurements on the Ce(Pd1-x Agx) system, with x ranging from 0 to 0.17, are presented. The magnetic structure of the ordered phase transforms from ferromagnetic to antiferromagnetic with only 2at.% Pd substitution, whereas reentrance of ferromagnetism is observed at 15at.% Ag content. We propose the break in the periodicity of the Coulomb potential (Pd is a hole-like atom, whereas Ag is an electron-like one) as the dominant effect for such a change in the magnetic behavior of this system.

Research paper thumbnail of Thermoelectric properties of Ce(La)Fe4Sb12 skutterudites under a magnetic field

Physical Review B, 2009

... PHYSICAL REVIEW B 80, 155109 [?]2009[?] Thermoelectric properties of Ce(La)Fe4Sb12 skutterudi... more ... PHYSICAL REVIEW B 80, 155109 [?]2009[?] Thermoelectric properties of Ce(La)Fe4Sb12 skutterudites under a magnetic field Romain Viennois,1,2,3,* Luc Girard,2 Didier Ravot,2 Silke ... 3 MM Koza, MR Johnson, R. Viennois, H. Mutka, L. Girard, and D. Ravot, Nature Mater. ...

Research paper thumbnail of Crystal field and magnetic ordering in the cubic Kondo lattice YbPdSb

Physica B: Condensed Matter, 1995

Specific heat and ~7°yb M6ssbauer spectroscopy measurements in cubic YbPdSb show that the Yb 3+ C... more Specific heat and ~7°yb M6ssbauer spectroscopy measurements in cubic YbPdSb show that the Yb 3+ CEF ground state is the F 8 quartet with a Kondo temperature T K = 7 K. In our sample, a first-order-like magnetic transition is observed at T = l K, with a small specific heat jump AC = 2 J/K/mol at the transition. The saturated spontaneous Yb 3+ moment is 1.3~, showing a Kondo reduction with respect to the F 8 saturated moment (---2/~). The M6ssbauer spectra with applied magnetic field and the magnetisation measurements at T= 0.1 K are consistent with an anisotropic RKKY exchange, of magnitude TRKKV ~6 K. YbPdSb is thus close to the magnetic/nonmagnetic border in Doniach's phase diagram, and the presence of long range ordering seems to be very sensitive to sample preparation.

Research paper thumbnail of Transport and magnetic properties of Ce z La 1− z Fe 4 Sb 12

Journal of Physics: Condensed Matter, 2006

... Fortunately, we do not have such inclusions here, either in the samples currently studied, or... more ... Fortunately, we do not have such inclusions here, either in the samples currently studied, or in the skutterudite samples we have studied in prior works [2, 8], and the magnetization is linear in H up to 4 T at T > 50 K. This is illustrated as an example Page 6. ...

Research paper thumbnail of Magnetic properties of the CeBi1−xTex solid solutions under pressure

Journal of Magnetism and Magnetic Materials, 1987

Research paper thumbnail of Metastable magnetic polaron effects in SmS

Journal of Magnetism and Magnetic Materials, 1985

ABSTRACT

Research paper thumbnail of Hall Effect in Heavy-Fermion Systems: UPt 3 , UAl 2 , CeAl 3 , CeRu 2 Si 2

Europhysics Letters (EPL), 1986

Research paper thumbnail of Electronic instabilities in heavy-fermion compounds

Physica B: Condensed Matter, 1991

We discuss a series of experiments that evidence that most of the heavy-fermion compounds are clo... more We discuss a series of experiments that evidence that most of the heavy-fermion compounds are close to an electronic or magnetic instability.

Research paper thumbnail of High-pressure magnetization of the heavy-Fermion system CeRu2Si 2

Journal De Physique, 1988

Research paper thumbnail of Specific heat and magnetic properties of Ce(Ru1−xPdx)2Si2

Physica B: Condensed Matter, 1995

In Ce(Ru~_xPdx)2Si2 the dilution of the transition metal leads to strong electronic effects resul... more In Ce(Ru~_xPdx)2Si2 the dilution of the transition metal leads to strong electronic effects resulting in the disappearance and the appearance of long-range magnetic order in CePd2Si 2 and CeRu2Si 2, respectively.

Research paper thumbnail of Volume effect at the metamagnetic transition in CeRu2Si2

Physical review. B, Condensed matter, 1989

Thermal-expansion (alpha) measurements performed in magnetic fields down to 1.3 K on the heavy-fe... more Thermal-expansion (alpha) measurements performed in magnetic fields down to 1.3 K on the heavy-fermion compound CeRu2Si2 show that the temperature at which the extremum in alpha occurs has a deep minimum at the metamagnetic transition (B*=7.8 T). In agreement with scaling theory, the change of sign in alpha occurs for B~=B*. A Kondo collapse model with ferromagnetic molecular field partially

Research paper thumbnail of Anisotropy in the thermal expansion of heavy-fermion UPt3 at the superconducting transition

Physical review. B, Condensed matter, 1990

The user has requested enhancement of the downloaded file.

Research paper thumbnail of Spin glass freezing in mixed valence dilute Y1−xTmxSe alloys

Research paper thumbnail of ChemInform Abstract: Itinerant Metamagnetism of CeRu2Si2: Bringing Out the Dead. Comparison with the New Sr3Ru2O7 Case

Research paper thumbnail of Field-Induced Renormalization Observed by Magnetoresistance in CERU2SI2

Solid State Communications, 1995

ABSTRACT

Research paper thumbnail of Thermal properties of a PrBa2Cu3O6+x ceramic with x=0.4 and 0.9

Physica B, 2000

The low-temperature variations of the thermal expansion coe$cient (¹ ) of a PrBa Cu O >V ceramic ... more The low-temperature variations of the thermal expansion coe$cient (¹ ) of a PrBa Cu O >V ceramic are reported for two oxygenation states (x"0.4 and 0.9). They show a peak at the ordering temperature of Pr deduced from the susceptibility (¹ ) and the speci"c heat C N (¹ ), i.e. at ¹ , "9.5 and 14.5 K, for x"0.4 and 0.9, respectively. The deduced GruK neisen parameter is rather large, show almost no anomaly at ¹ , , but a sharp increase below +5 K. The origin of these variations is discussed in terms of magnetic behaviour of the Pr and Cu sublattices.

Research paper thumbnail of ChemInform Abstract: Crystal Structures and Phase Transitions in A-Site Deficient Perovskites Ln 1/3 TaO 3

ChemInform, 2009

ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Research paper thumbnail of Thermal expansion and the Grueneisen parameter near the magnetic instability in Ce_{1-x}La_xRu_2Si_2

Journal of Hypertension - J HYPERTENSION, 1997

Research paper thumbnail of Extended versus Local Fluctuations in Quantum Critical Ce(Ru1-xFex)2Ge2 (x=xc=0.76)

Physical Review Letters, 2003

We present inelastic neutron scattering experiments, performed near the antiferromagnetic quantum... more We present inelastic neutron scattering experiments, performed near the antiferromagnetic quantum critical point in CeRu 0:24 Fe 0:76 2 Ge 2 . Both local and long-range fluctuations of the local moments are observed, but due to the Kondo effect only the latter are critical. We propose a phenomenological expression which fits the energy E, temperature T, and wave vector q dependences of the dynamic susceptibility, describing the non-Fermi liquid E=T scaling found at every q.

Research paper thumbnail of The magnetovolume properties of Y(Co1-xAlx)2 compounds

Research paper thumbnail of Low temperature properties of Ce(Pd 1- x Ag x )

European Physical Journal B - EUR PHYS J B, 1996

Low temperature magnetic, transport and thermal measurements on the Ce(Pd1-x Agx) system, with x ... more Low temperature magnetic, transport and thermal measurements on the Ce(Pd1-x Agx) system, with x ranging from 0 to 0.17, are presented. The magnetic structure of the ordered phase transforms from ferromagnetic to antiferromagnetic with only 2at.% Pd substitution, whereas reentrance of ferromagnetism is observed at 15at.% Ag content. We propose the break in the periodicity of the Coulomb potential (Pd is a hole-like atom, whereas Ag is an electron-like one) as the dominant effect for such a change in the magnetic behavior of this system.

Research paper thumbnail of Thermoelectric properties of Ce(La)Fe4Sb12 skutterudites under a magnetic field

Physical Review B, 2009

... PHYSICAL REVIEW B 80, 155109 [?]2009[?] Thermoelectric properties of Ce(La)Fe4Sb12 skutterudi... more ... PHYSICAL REVIEW B 80, 155109 [?]2009[?] Thermoelectric properties of Ce(La)Fe4Sb12 skutterudites under a magnetic field Romain Viennois,1,2,3,* Luc Girard,2 Didier Ravot,2 Silke ... 3 MM Koza, MR Johnson, R. Viennois, H. Mutka, L. Girard, and D. Ravot, Nature Mater. ...

Research paper thumbnail of Crystal field and magnetic ordering in the cubic Kondo lattice YbPdSb

Physica B: Condensed Matter, 1995

Specific heat and ~7°yb M6ssbauer spectroscopy measurements in cubic YbPdSb show that the Yb 3+ C... more Specific heat and ~7°yb M6ssbauer spectroscopy measurements in cubic YbPdSb show that the Yb 3+ CEF ground state is the F 8 quartet with a Kondo temperature T K = 7 K. In our sample, a first-order-like magnetic transition is observed at T = l K, with a small specific heat jump AC = 2 J/K/mol at the transition. The saturated spontaneous Yb 3+ moment is 1.3~, showing a Kondo reduction with respect to the F 8 saturated moment (---2/~). The M6ssbauer spectra with applied magnetic field and the magnetisation measurements at T= 0.1 K are consistent with an anisotropic RKKY exchange, of magnitude TRKKV ~6 K. YbPdSb is thus close to the magnetic/nonmagnetic border in Doniach's phase diagram, and the presence of long range ordering seems to be very sensitive to sample preparation.

Research paper thumbnail of Transport and magnetic properties of Ce z La 1− z Fe 4 Sb 12

Journal of Physics: Condensed Matter, 2006

... Fortunately, we do not have such inclusions here, either in the samples currently studied, or... more ... Fortunately, we do not have such inclusions here, either in the samples currently studied, or in the skutterudite samples we have studied in prior works [2, 8], and the magnetization is linear in H up to 4 T at T > 50 K. This is illustrated as an example Page 6. ...

Research paper thumbnail of Magnetic properties of the CeBi1−xTex solid solutions under pressure

Journal of Magnetism and Magnetic Materials, 1987

Research paper thumbnail of Metastable magnetic polaron effects in SmS

Journal of Magnetism and Magnetic Materials, 1985

ABSTRACT

Research paper thumbnail of Hall Effect in Heavy-Fermion Systems: UPt 3 , UAl 2 , CeAl 3 , CeRu 2 Si 2

Europhysics Letters (EPL), 1986

Research paper thumbnail of Electronic instabilities in heavy-fermion compounds

Physica B: Condensed Matter, 1991

We discuss a series of experiments that evidence that most of the heavy-fermion compounds are clo... more We discuss a series of experiments that evidence that most of the heavy-fermion compounds are close to an electronic or magnetic instability.

Research paper thumbnail of High-pressure magnetization of the heavy-Fermion system CeRu2Si 2

Journal De Physique, 1988

Research paper thumbnail of Specific heat and magnetic properties of Ce(Ru1−xPdx)2Si2

Physica B: Condensed Matter, 1995

In Ce(Ru~_xPdx)2Si2 the dilution of the transition metal leads to strong electronic effects resul... more In Ce(Ru~_xPdx)2Si2 the dilution of the transition metal leads to strong electronic effects resulting in the disappearance and the appearance of long-range magnetic order in CePd2Si 2 and CeRu2Si 2, respectively.

Research paper thumbnail of Volume effect at the metamagnetic transition in CeRu2Si2

Physical review. B, Condensed matter, 1989

Thermal-expansion (alpha) measurements performed in magnetic fields down to 1.3 K on the heavy-fe... more Thermal-expansion (alpha) measurements performed in magnetic fields down to 1.3 K on the heavy-fermion compound CeRu2Si2 show that the temperature at which the extremum in alpha occurs has a deep minimum at the metamagnetic transition (B*=7.8 T). In agreement with scaling theory, the change of sign in alpha occurs for B~=B*. A Kondo collapse model with ferromagnetic molecular field partially

Research paper thumbnail of Anisotropy in the thermal expansion of heavy-fermion UPt3 at the superconducting transition

Physical review. B, Condensed matter, 1990

The user has requested enhancement of the downloaded file.

Research paper thumbnail of Spin glass freezing in mixed valence dilute Y1−xTmxSe alloys

Research paper thumbnail of ChemInform Abstract: Itinerant Metamagnetism of CeRu2Si2: Bringing Out the Dead. Comparison with the New Sr3Ru2O7 Case

Research paper thumbnail of Field-Induced Renormalization Observed by Magnetoresistance in CERU2SI2

Solid State Communications, 1995

ABSTRACT

Research paper thumbnail of Thermal properties of a PrBa2Cu3O6+x ceramic with x=0.4 and 0.9

Physica B, 2000

The low-temperature variations of the thermal expansion coe$cient (¹ ) of a PrBa Cu O >V ceramic ... more The low-temperature variations of the thermal expansion coe$cient (¹ ) of a PrBa Cu O >V ceramic are reported for two oxygenation states (x"0.4 and 0.9). They show a peak at the ordering temperature of Pr deduced from the susceptibility (¹ ) and the speci"c heat C N (¹ ), i.e. at ¹ , "9.5 and 14.5 K, for x"0.4 and 0.9, respectively. The deduced GruK neisen parameter is rather large, show almost no anomaly at ¹ , , but a sharp increase below +5 K. The origin of these variations is discussed in terms of magnetic behaviour of the Pr and Cu sublattices.

Research paper thumbnail of ChemInform Abstract: Crystal Structures and Phase Transitions in A-Site Deficient Perovskites Ln 1/3 TaO 3

ChemInform, 2009

ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Research paper thumbnail of Thermal expansion and the Grueneisen parameter near the magnetic instability in Ce_{1-x}La_xRu_2Si_2

Journal of Hypertension - J HYPERTENSION, 1997

Research paper thumbnail of Extended versus Local Fluctuations in Quantum Critical Ce(Ru1-xFex)2Ge2 (x=xc=0.76)

Physical Review Letters, 2003

We present inelastic neutron scattering experiments, performed near the antiferromagnetic quantum... more We present inelastic neutron scattering experiments, performed near the antiferromagnetic quantum critical point in CeRu 0:24 Fe 0:76 2 Ge 2 . Both local and long-range fluctuations of the local moments are observed, but due to the Kondo effect only the latter are critical. We propose a phenomenological expression which fits the energy E, temperature T, and wave vector q dependences of the dynamic susceptibility, describing the non-Fermi liquid E=T scaling found at every q.