Chapter 133 High pressure studies — physical properties of anomalous Ce, Yb and U compounds

Thompson, J. D.; Lawrence, J. M.

doi:10.1016/s0168-1273(05)80062-5

Cited by 25 publications

(9 citation statements)

References 249 publications

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“…The behavior of A 0 can be understood from the general view of increasing the Kondo temperature and stabilizing the Fermi liquid with increasing pressure, as commonly observed in Ce compounds. [19] We attribute the decreasing H QCP to the fact that the critical field is moving inside the superconducting dome. The latter point is emphasized in figure 2(b).…”

Section: Pacs Numbersmentioning

confidence: 95%

Pressure study of quantum criticality inCeCoIn5

et al. 2006

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We report resistivity measurements in the normal state of CeCoIn5 down to 40 mK and simultaneously in magnetic fields up to 9 T in the [001] crystallographic direction and under pressures up to 1.3 GPa. At ambient pressure the data are consistent with a field tuned quantum critical point coincident with the superconducting upper critical field Hc2, as observed previously. We find that with increasing pressure the quantum critical point moves inside the superconducting dome to lower fields. Thus, we can rule out that superconductivity is directly responsible for the non-Fermi liquid behavior in CeCoIn5. Instead, the data point toward an antiferromagnetic quantum critical point scenario. PACS numbers:A quantum critical point is simply the point at which a second order phase transition occurs at T = 0, where quantum fluctuations are present. Classical phase transitions are now well understood. While theoretically there is a natural extension to T = 0,[3, 4, 5] the experimental systems (and in particular heavy fermion systems) display serious discrepancies with these predictions. [6] As disorder may profoundly influence the behavior at a quantum critical point, there is a great benefit in examining quantum critical systems which are stoichiometric, and hence, relatively disorder free. CeCoIn 5 is one of a relatively small number of such systems.CeCoIn 5 is a heavy fermion superconductor with T c = 2.3 K.[7] The normal state possesses non-Fermi liquid properties in zero field (T linear resistivity, T ln(T ) specific heat, and modified Curie-Weiss χ, compared to the Fermi liquid expectations of T 2 resistivity, T linear specific heat, and constant χ) indicative of a nearby underlying quantum critical point. [8,9] By applying the magnetic field along the tetragonal c-axis a field-tuned quantum critical point (QCP) was identified at H QCP = 5 T. [1,2] The fact that the superconducting upper critical field H c2 is also at 5 T raises the question of whether superconducting fluctuations could be responsible for the field-tuned non-Fermi liquid behavior. However, this observation (that H c2 ≈ H QCP ) is likely to be an accidental coincidence for several reasons: i) it is not clear if a superconductor has sufficiently strong fluctuations to produce an extended critical regime, ii) the superconducting transition itself becomes first order below 0.7 K in CeCoIn 5 ,[10] which should cutoff any diverging fluctuations, and iii) similarities in the zero field pressure-temperature phase diagrams of CeRhIn 5 and CeCoIn 5 suggests that CeCoIn 5 at ambient pressure is in close proximity to an antiferromagnetic quantum critical point, as is observed in CeRhIn 5 .[9] However, two experiments designed to separate H QCP from H c2 , via magnetic field anisotropy [11] or Sn doping studies [12], failed to do so. Applying the magnetic field in the ab-plane increases H c2 to 12 T, while in Sn doping studies the c-axis H c2 was suppressed to as low as 2.75 T for CeCoIn 4.88 Sn 0.12 . Despite this variation in H c2 by more than a factor of 4, on...

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Section: Pacs Numbersmentioning

confidence: 95%

Pressure study of quantum criticality inCeCoIn5

et al. 2006

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“…This type of behavior has been seen in numerous Ce compounds. 51,52,53 Near the QCP, many different behaviors can be observed.…”

Section: 47mentioning

confidence: 99%

Compressibility ofCeMIn5andCe2MIn8
Kumar
¹
,
Cornelius
²
,
Sarrao
³

2004
Phys. Rev. B
30
1
13
0
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“…In the search for materials having higher thermoelectric power by means of pressure tuning, it is important to obtain better insight into the underlying mechanisms that cause changes in the thermoelectric power upon compression. Intermediate valence (IV) has been an interesting property of many rare earth (RE) intermetallic compounds [10,11]. It is believed that certain IV compounds go through the sequence: magnetically ordered trivalence, non-magnetic trivalence (Kondo effect), intermediate valence and tetravalence, as 4f level is gradually raised from well below E F to well above E F [10].…”

Section: Introductionmentioning

confidence: 99%

Electronic structure and thermoelectric power of cerium compounds at high pressure

Shekar

Rajagopalan

Meng

et al. 2005

Journal of Alloys and Compounds

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Chapter 133 High pressure studies — physical properties of anomalous Ce, Yb and U compounds

Cited by 25 publications

References 249 publications

Pressure study of quantum criticality inCeCoIn5

Pressure study of quantum criticality inCeCoIn5

Compressibility ofCeMIn5andCe2MIn8
Kumar
¹
,
Cornelius
²
,
Sarrao
³

2004
Phys. Rev. B
30
1
13
0
View full text Add to dashboard Cite

Electronic structure and thermoelectric power of cerium compounds at high pressure

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Chapter 133 High pressure studies — physical properties of anomalous Ce, Yb and U compounds

Cited by 25 publications

References 249 publications

Pressure study of quantum criticality inCeCoIn5

Pressure study of quantum criticality inCeCoIn5

Compressibility ofCeMIn5andCe2MIn8Kumar1, Cornelius2, Sarrao3 2004Phys. Rev. B301130View full textAdd to dashboardCite

Electronic structure and thermoelectric power of cerium compounds at high pressure

Contact Info

Product

Resources

About

Compressibility ofCeMIn5andCe2MIn8
Kumar
¹
,
Cornelius
²
,
Sarrao
³

2004
Phys. Rev. B
30
1
13
0
View full text Add to dashboard Cite